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Subject[patch 03/38] CKRM e18: Core infrastructure
This patch contains the core infrastructure code for CKRM.  It includes
the interfaces for the classification engine code and the resource control
filesystems (rcfs). Rcfs is the mechanism for setting class assignments
and policies within CKRM.

Signed-Off-By: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-Off-By: Hubertus Franke <frankeh@us.ibm.com>
Signed-Off-By: Shailabh Nagar <nagar@us.ibm.com>
Signed-Off-By: Gerrit Huizenga <gh@us.ibm.com>
Signed-Off-By: Vivek Kashyap <vivk@us.ibm.com>


include/linux/ckrm_ce.h | 95 ++++
include/linux/ckrm_events.h | 38 +
include/linux/ckrm_rc.h | 345 +++++++++++++++++
include/linux/rcfs.h | 96 ++++
include/linux/sched.h | 5
init/main.c | 2
kernel/ckrm/Makefile | 2
kernel/ckrm/ckrm.c | 892 ++++++++++++++++++++++++++++++++++++++++++++
kernel/ckrm/ckrmutils.c | 188 +++++++++
9 files changed, 1648 insertions(+), 15 deletions(-)

Index: linux-2.6.12-ckrm1/include/linux/ckrm_ce.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/include/linux/ckrm_ce.h 2005-06-20 13:08:29.000000000 -0700
@@ -0,0 +1,95 @@
+/*
+ * ckrm_ce.h - Header file to be used by Classification Engine of CKRM
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Shailabh Nagar, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ *
+ * Provides data structures, macros and kernel API of CKRM for
+ * classification engine.
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#ifndef _LINUX_CKRM_CE_H
+#define _LINUX_CKRM_CE_H
+
+#ifdef CONFIG_CKRM
+
+#include <linux/ckrm_events.h>
+
+/*
+ * Action parameters identifying the cause of a task<->class notify callback
+ * these can perculate up to user daemon consuming records send by the
+ * classification engine
+ */
+
+typedef void *(*ce_classify_fct) (enum ckrm_event event, void *obj, ...);
+typedef void (*ce_notify_fct) (enum ckrm_event event, void *classobj,
+ void *obj);
+
+struct ckrm_eng_callback {
+ /* general state information */
+ int always_callback; /* set if CE should always be called back
+ regardless of numclasses */
+
+ /* callbacks which are called without holding locks */
+
+ unsigned long c_interest; /* set of classification events of
+ * interest to CE
+ */
+
+ /* generic classify */
+ ce_classify_fct classify;
+
+ /* class added */
+ void (*class_add) (const char *name, void *core, int classtype);
+
+ /* class deleted */
+ void (*class_delete) (const char *name, void *core, int classtype);
+
+ /* callbacks which are called while holding task_lock(tsk) */
+ unsigned long n_interest; /* set of notification events of
+ * interest to CE
+ */
+ /* notify on class switch */
+ ce_notify_fct notify;
+};
+
+struct inode;
+struct dentry;
+
+struct rbce_eng_callback {
+ int (*mkdir) (struct inode *, struct dentry *, int); /* mkdir */
+ int (*rmdir) (struct inode *, struct dentry *); /* rmdir */
+ int (*mnt) (void);
+ int (*umnt) (void);
+};
+
+extern int ckrm_register_engine(const char *name, struct ckrm_eng_callback *);
+extern int ckrm_unregister_engine(const char *name);
+
+extern void *ckrm_classobj(char *, int *classtype);
+
+extern int rcfs_register_engine(struct rbce_eng_callback *);
+extern int rcfs_unregister_engine(struct rbce_eng_callback *);
+
+extern int ckrm_reclassify(int pid);
+
+#ifndef _LINUX_CKRM_RC_H
+
+extern void ckrm_core_grab(struct ckrm_core_class *core);
+extern void ckrm_core_drop(struct ckrm_core_class *core);
+#endif
+
+#endif /* CONFIG_CKRM */
+#endif /* _LINUX_CKRM_CE_H */
Index: linux-2.6.12-ckrm1/include/linux/ckrm_events.h
===================================================================
--- linux-2.6.12-ckrm1.orig/include/linux/ckrm_events.h 2005-06-20 13:08:20.000000000 -0700
+++ linux-2.6.12-ckrm1/include/linux/ckrm_events.h 2005-06-20 13:08:29.000000000 -0700
@@ -108,70 +108,78 @@ int ckrm_unregister_event_cb(enum ckrm_e
extern void ckrm_invoke_event_cb_chain(enum ckrm_event ev, void *arg);

/* forward declarations for function arguments */
-struct task_struct;
+
+#include <linux/sched.h> /* for task_struct */
+
struct sock;
struct user_struct;

static inline void ckrm_cb_fork(struct task_struct *p)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_FORK, p);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_FORK, p);
}

static inline void ckrm_cb_newtask(struct task_struct *p)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_NEWTASK, p);
+
+ p->ce_data = NULL;
+ spin_lock_init(&p->ckrm_tsklock);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_NEWTASK, p);
}

static inline void ckrm_cb_exit(struct task_struct *p)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_EXIT, p);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_EXIT, p);
+ p->ce_data = NULL;
}

static inline void ckrm_cb_exec(char *c)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_EXEC, c);
-}
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_EXEC, c);
+ }

static inline void ckrm_cb_uid(void)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_UID, NULL);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_UID, NULL);
}

static inline void ckrm_cb_gid(void)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_GID, NULL);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_GID, NULL);
}

static inline void ckrm_cb_apptag(void)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_APPTAG, NULL);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_APPTAG, NULL);
}

static inline void ckrm_cb_login(void)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_LOGIN, NULL);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_LOGIN, NULL);
}

static inline void ckrm_cb_useradd(struct user_struct *u)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_USERADD, u);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_USERADD, u);
}

static inline void ckrm_cb_userdel(struct user_struct *u)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_USERDEL, u);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_USERDEL, u);
}

static inline void ckrm_cb_listen_start(struct sock *s)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_LISTEN_START, s);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_LISTEN_START, s);
}

static inline void ckrm_cb_listen_stop(struct sock *s)
{
- ckrm_invoke_event_cb_chain(CKRM_EVENT_LISTEN_STOP, s);
+ ckrm_invoke_event_cb_chain(CKRM_EVENT_LISTEN_STOP, s);
}

+extern void ckrm_init(void);
+
#else /* !CONFIG_CKRM */

static inline void ckrm_cb_fork(struct task_struct *p) { }
@@ -187,6 +195,8 @@ static inline void ckrm_cb_userdel(struc
static inline void ckrm_cb_listen_start(struct sock *s) { }
static inline void ckrm_cb_listen_stop(struct sock *s) { }

+#define ckrm_init() do { } while (0)
+
#endif /* CONFIG_CKRM */

#endif /* _LINUX_CKRM_EVENTS_H */
Index: linux-2.6.12-ckrm1/include/linux/ckrm_rc.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/include/linux/ckrm_rc.h 2005-06-20 13:08:29.000000000 -0700
@@ -0,0 +1,345 @@
+/*
+ * ckrm_rc.h - Header file to be used by Resource controllers of CKRM
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Shailabh Nagar, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Vivek Kashyap , IBM Corp. 2004
+ *
+ * Provides data structures, macros and kernel API of CKRM for
+ * resource controllers.
+ *
+ * More details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#ifndef _LINUX_CKRM_RC_H
+#define _LINUX_CKRM_RC_H
+
+#ifdef CONFIG_CKRM
+
+#include <linux/list.h>
+#include <linux/ckrm_events.h>
+#include <linux/ckrm_ce.h>
+#include <linux/seq_file.h>
+
+#define CKRM_MAX_CLASSTYPES 32 /* maximum number of class types */
+#define CKRM_MAX_CLASSTYPE_NAME 32 /* maximum classtype name length */
+
+#define CKRM_MAX_RES_CTLRS 8 /* maximum resource controllers per classtype */
+#define CKRM_MAX_RES_NAME 128 /* maximum resource controller name length */
+
+struct ckrm_core_class;
+struct ckrm_classtype;
+
+/*
+ * Share specifications
+ */
+
+struct ckrm_shares {
+ int my_guarantee;
+ int my_limit;
+ int total_guarantee;
+ int max_limit;
+ int unused_guarantee; /* not used as parameters */
+ int cur_max_limit; /* not used as parameters */
+};
+
+#define CKRM_SHARE_UNCHANGED (-1)
+#define CKRM_SHARE_DONTCARE (-2)
+#define CKRM_SHARE_DFLT_TOTAL_GUARANTEE (100)
+#define CKRM_SHARE_DFLT_MAX_LIMIT (100)
+
+/*
+ * RESOURCE CONTROLLERS
+ */
+
+/* resource controller callback structure */
+
+struct ckrm_res_ctlr {
+ char res_name[CKRM_MAX_RES_NAME];
+ int res_hdepth; /* maximum hierarchy */
+ int resid; /* (for now) same as the enum resid */
+ struct ckrm_classtype *classtype; /* classtype owning this res ctlr */
+
+ /* allocate/free new resource class object for resource controller */
+ void *(*res_alloc) (struct ckrm_core_class * this,
+ struct ckrm_core_class * parent);
+ void (*res_free) (void *);
+
+ /* set/get limits/guarantees for a resource controller class */
+ int (*set_share_values) (void *, struct ckrm_shares * shares);
+ int (*get_share_values) (void *, struct ckrm_shares * shares);
+
+ /* statistics and configuration access */
+ int (*get_stats) (void *, struct seq_file *);
+ int (*reset_stats) (void *);
+ int (*show_config) (void *, struct seq_file *);
+ int (*set_config) (void *, const char *cfgstr);
+
+ void (*change_resclass) (void *, void *, void *);
+};
+
+/*
+ * CKRM_CLASSTYPE
+ *
+ * A <struct ckrm_classtype> object describes a dimension for CKRM to classify
+ * along. Need to provide methods to create and manipulate class objects in
+ * this dimension
+ */
+
+/* list of predefined class types, we always recognize */
+#define CKRM_CLASSTYPE_TASK_CLASS 0
+#define CKRM_CLASSTYPE_SOCKET_CLASS 1
+#define CKRM_RESV_CLASSTYPES 2 /* always +1 of last known type */
+
+#define CKRM_MAX_TYPENAME_LEN 32
+
+struct ckrm_classtype {
+ /* TODO: Review for cache alignment */
+
+ /* resource controllers */
+
+ spinlock_t res_ctlrs_lock; /* protect res ctlr related data */
+ int max_res_ctlrs; /* max number of res ctlrs allowed */
+ int max_resid; /* max resid used */
+ int resid_reserved; /* max number of reserved controllers */
+ long bit_res_ctlrs; /* bitmap of resource ID used */
+ atomic_t nr_resusers[CKRM_MAX_RES_CTLRS];
+ struct ckrm_res_ctlr *res_ctlrs[CKRM_MAX_RES_CTLRS];
+
+ /* state about my classes */
+
+ struct ckrm_core_class *default_class;
+ struct list_head classes; /* link all classes of this classtype */
+ int num_classes;
+
+ /* state about my ce interaction */
+ atomic_t ce_regd; /* if CE registered */
+ int ce_cb_active; /* if Callbacks active */
+ atomic_t ce_nr_users; /* number of active transient calls */
+ struct ckrm_eng_callback ce_callbacks; /* callback engine */
+
+ /* Begin classtype-rcfs private data. No rcfs/fs specific types used. */
+
+ int mfidx; /* Index into genmfdesc array used to initialize */
+ void *mfdesc; /* Array of descriptors of root and magic files */
+ int mfcount; /* length of above array */
+ void *rootde; /* root dentry created by rcfs */
+ /* End rcfs private data */
+
+ char name[CKRM_MAX_TYPENAME_LEN]; /* currently same as mfdesc[0]->name */
+ /* but could be different */
+ int type_id; /* unique TypeID */
+ int maxdepth; /* maximum depth supported */
+
+ /* functions to be called on any class type by external API's */
+
+ struct ckrm_core_class *(*alloc) (struct ckrm_core_class * parent,
+ const char *name);
+ int (*free) (struct ckrm_core_class * cls);
+ int (*show_members) (struct ckrm_core_class *, struct seq_file *);
+ int (*show_stats) (struct ckrm_core_class *, struct seq_file *);
+ int (*show_config) (struct ckrm_core_class *, struct seq_file *);
+ int (*show_shares) (struct ckrm_core_class *, struct seq_file *);
+
+ int (*reset_stats) (struct ckrm_core_class *, const char *resname,
+ const char *);
+ int (*set_config) (struct ckrm_core_class *, const char *resname,
+ const char *cfgstr);
+ int (*set_shares) (struct ckrm_core_class *, const char *resname,
+ struct ckrm_shares * shares);
+ int (*forced_reclassify) (struct ckrm_core_class *, const char *);
+
+ /* functions to be called on a class type by ckrm internals */
+
+ /* class initialization for new RC */
+ void (*add_resctrl) (struct ckrm_core_class *, int resid);
+};
+
+/*
+ * CKRM CORE CLASS
+ * common part to any class structure (i.e. instance of a classtype)
+ */
+
+/*
+ * basic definition of a hierarchy that is to be used by the the CORE classes
+ * and can be used by the resource class objects
+ */
+
+#define CKRM_CORE_MAGIC 0xBADCAFFE
+
+struct ckrm_hnode {
+ struct ckrm_core_class *parent;
+ struct list_head siblings;
+ struct list_head children;
+};
+
+struct ckrm_core_class {
+ struct ckrm_classtype *classtype;
+ void *res_class[CKRM_MAX_RES_CTLRS]; /* resource classes */
+ spinlock_t class_lock; /* protects list,array above */
+
+ struct list_head objlist; /* generic object list */
+ struct list_head clslist; /* peer classtype classes */
+ struct dentry *dentry; /* dentry of inode in the RCFS */
+ int magic;
+
+ struct ckrm_hnode hnode; /* hierarchy */
+ rwlock_t hnode_rwlock; /* protects hnode above. */
+ atomic_t refcnt;
+ const char *name;
+ int delayed; /* core deletion delayed */
+ /* because of race conditions */
+};
+
+/* type coerce between derived class types and ckrm core class type */
+#define class_type(type,coreptr) container_of(coreptr,type,core)
+#define class_core(clsptr) (&(clsptr)->core)
+/* locking classes */
+#define class_lock(coreptr) spin_lock(&(coreptr)->class_lock)
+#define class_unlock(coreptr) spin_unlock(&(coreptr)->class_lock)
+/* what type is a class of ISA */
+#define class_isa(clsptr) (class_core(clsptr)->classtype)
+
+/*
+ * OTHER
+ */
+
+#define ckrm_get_res_class(rescls, resid, type) \
+ ((type*) (((resid != -1) && ((rescls) != NULL) \
+ && ((rescls) != (void *)-1)) ? \
+ ((struct ckrm_core_class *)(rescls))->res_class[resid] : NULL))
+
+
+extern int ckrm_register_res_ctlr(struct ckrm_classtype *, struct ckrm_res_ctlr *);
+extern int ckrm_unregister_res_ctlr(struct ckrm_res_ctlr *);
+
+extern int ckrm_validate_and_grab_core(struct ckrm_core_class *core);
+extern int ckrm_init_core_class(struct ckrm_classtype *clstype,
+ struct ckrm_core_class *dcore,
+ struct ckrm_core_class *parent,
+ const char *name);
+extern int ckrm_release_core_class(struct ckrm_core_class *);
+
+/* TODO: can disappear after cls del debugging */
+
+extern struct ckrm_res_ctlr *ckrm_resctlr_lookup(struct ckrm_classtype *type,
+ const char *resname);
+
+extern void ckrm_lock_hier(struct ckrm_core_class *);
+extern void ckrm_unlock_hier(struct ckrm_core_class *);
+extern struct ckrm_core_class *ckrm_get_next_child(struct ckrm_core_class *,
+ struct ckrm_core_class *);
+
+extern void child_guarantee_changed(struct ckrm_shares *, int, int);
+extern void child_maxlimit_changed(struct ckrm_shares *, int);
+extern int set_shares(struct ckrm_shares *, struct ckrm_shares *,
+ struct ckrm_shares *);
+
+/* classtype registration and lookup */
+extern int ckrm_register_classtype(struct ckrm_classtype *clstype);
+extern int ckrm_unregister_classtype(struct ckrm_classtype *clstype);
+extern struct ckrm_classtype *ckrm_find_classtype_by_name(const char *name);
+
+/* default functions that can be used in classtypes's function table */
+extern int ckrm_class_show_shares(struct ckrm_core_class *core,
+ struct seq_file *seq);
+extern int ckrm_class_show_stats(struct ckrm_core_class *core,
+ struct seq_file *seq);
+extern int ckrm_class_show_config(struct ckrm_core_class *core,
+ struct seq_file *seq);
+extern int ckrm_class_set_config(struct ckrm_core_class *core,
+ const char *resname, const char *cfgstr);
+extern int ckrm_class_set_shares(struct ckrm_core_class *core,
+ const char *resname,
+ struct ckrm_shares *shares);
+extern int ckrm_class_reset_stats(struct ckrm_core_class *core,
+ const char *resname, const char *unused);
+
+static inline void ckrm_core_grab(struct ckrm_core_class *core)
+{
+ if (core)
+ atomic_inc(&core->refcnt);
+}
+
+static inline void ckrm_core_drop(struct ckrm_core_class *core)
+{
+ /* only make definition available in this context */
+ extern void ckrm_free_core_class(struct ckrm_core_class *core);
+ if (core && (atomic_dec_and_test(&core->refcnt)))
+ ckrm_free_core_class(core);
+}
+
+static inline unsigned int ckrm_is_core_valid(struct ckrm_core_class * core)
+{
+ return (core && (core->magic == CKRM_CORE_MAGIC));
+}
+
+/*
+ * iterate through all associate resource controllers:
+ * requires following arguments (ckrm_core_class *cls,
+ * ckrm_res_ctrl *ctlr,
+ * void *robj,
+ * int bmap)
+ */
+
+#define forall_class_resobjs(cls,rcbs,robj,bmap) \
+ for ( bmap=((cls->classtype)->bit_res_ctlrs) ; \
+ ({ int rid; ((rid=ffs(bmap)-1) >= 0) && \
+ (bmap &= ~(1<<rid), \
+ ((rcbs=cls->classtype->res_ctlrs[rid]) \
+ && (robj=cls->res_class[rid]))); }); \
+ )
+
+extern struct ckrm_classtype *ckrm_classtypes[];
+
+/*
+ * CE Invocation interface
+ */
+
+#define ce_protect(ctype) (atomic_inc(&((ctype)->ce_nr_users)))
+#define ce_release(ctype) (atomic_dec(&((ctype)->ce_nr_users)))
+
+/* CE Classification callbacks with */
+
+#define CE_CLASSIFY_NORET(ctype, event, objs_to_classify...) \
+do { \
+ if ((ctype)->ce_cb_active \
+ && (test_bit(event,&(ctype)->ce_callbacks.c_interest))) \
+ (*(ctype)->ce_callbacks.classify)(event, \
+ objs_to_classify); \
+} while (0)
+
+#define CE_CLASSIFY_RET(ret, ctype, event, objs_to_classify...) \
+do { \
+ if ((ctype)->ce_cb_active \
+ && (test_bit(event,&(ctype)->ce_callbacks.c_interest))) \
+ ret = (*(ctype)->ce_callbacks.classify)(event, \
+ objs_to_classify);\
+} while (0)
+
+#define CE_NOTIFY(ctype, event, cls, objs_to_classify) \
+do { \
+ if ((ctype)->ce_cb_active \
+ && (test_bit(event,&(ctype)->ce_callbacks.n_interest))) \
+ (*(ctype)->ce_callbacks.notify)(event, \
+ cls,objs_to_classify); \
+} while (0)
+
+/*
+ * RCFS related
+ */
+
+/* vars needed by other modules/core */
+
+extern int rcfs_mounted;
+extern int rcfs_engine_regd;
+
+#endif /* CONFIG_CKRM */
+#endif /* _LINUX_CKRM_RC_H */
Index: linux-2.6.12-ckrm1/include/linux/rcfs.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/include/linux/rcfs.h 2005-06-20 13:08:29.000000000 -0700
@@ -0,0 +1,96 @@
+#ifndef _LINUX_RCFS_H
+#define _LINUX_RCFS_H
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/ckrm_events.h>
+#include <linux/ckrm_rc.h>
+#include <linux/ckrm_ce.h>
+
+/*
+ * The following declarations cannot be included in any of ckrm*.h files
+ * without jumping hoops. Remove later when rearrangements done
+ */
+
+#define RCFS_MAGIC 0x4feedbac
+#define RCFS_MAGF_NAMELEN 20
+extern int RCFS_IS_MAGIC;
+
+#define rcfs_is_magic(dentry) ((dentry)->d_fsdata == &RCFS_IS_MAGIC)
+
+struct rcfs_inode_info {
+ struct ckrm_core_class *core;
+ char *name;
+ struct inode vfs_inode;
+};
+
+#define RCFS_DEFAULT_DIR_MODE (S_IFDIR | S_IRUGO | S_IXUGO)
+#define RCFS_DEFAULT_FILE_MODE (S_IFREG | S_IRUSR | S_IWUSR | S_IRGRP |S_IROTH)
+
+struct rcfs_magf {
+ char name[RCFS_MAGF_NAMELEN];
+ int mode;
+ struct inode_operations *i_op;
+ struct file_operations *i_fop;
+};
+
+struct rcfs_mfdesc {
+ struct rcfs_magf *rootmf; /* Root directory and its magic files */
+ int rootmflen; /* length of above array */
+ /*
+ * Can have a different magf describing magic files
+ * for non-root entries too.
+ */
+};
+
+extern struct rcfs_mfdesc *genmfdesc[];
+
+struct rcfs_inode_info *RCFS_I(struct inode *inode);
+
+int rcfs_empty(struct dentry *);
+struct inode *rcfs_get_inode(struct super_block *, int, dev_t);
+int rcfs_mknod(struct inode *, struct dentry *, int, dev_t);
+int _rcfs_mknod(struct inode *, struct dentry *, int, dev_t);
+int rcfs_mkdir(struct inode *, struct dentry *, int);
+struct ckrm_core_class *rcfs_make_core(struct dentry *, struct ckrm_core_class *);
+struct dentry *rcfs_set_magf_byname(char *, void *);
+
+struct dentry *rcfs_create_internal(struct dentry *, struct rcfs_magf *, int);
+int rcfs_delete_internal(struct dentry *);
+int rcfs_create_magic(struct dentry *, struct rcfs_magf *, int);
+int rcfs_clear_magic(struct dentry *);
+
+extern struct super_operations rcfs_super_ops;
+extern struct address_space_operations rcfs_aops;
+
+extern struct inode_operations rcfs_dir_inode_operations;
+extern struct inode_operations rcfs_rootdir_inode_operations;
+extern struct inode_operations rcfs_file_inode_operations;
+
+extern struct file_operations target_fileops;
+extern struct file_operations shares_fileops;
+extern struct file_operations stats_fileops;
+extern struct file_operations config_fileops;
+extern struct file_operations members_fileops;
+extern struct file_operations reclassify_fileops;
+extern struct file_operations rcfs_file_operations;
+
+/* Callbacks into rcfs from ckrm */
+
+struct rcfs_functions {
+ int (*mkroot) (struct rcfs_magf *, int, struct dentry **);
+ int (*rmroot) (struct dentry *);
+ int (*register_classtype) (struct ckrm_classtype *);
+ int (*deregister_classtype) (struct ckrm_classtype *);
+};
+
+int rcfs_register_classtype(struct ckrm_classtype *);
+int rcfs_deregister_classtype(struct ckrm_classtype *);
+int rcfs_mkroot(struct rcfs_magf *, int, struct dentry **);
+int rcfs_rmroot(struct dentry *);
+
+#define RCFS_ROOT "/rcfs" /* TODO: Should use the mount point */
+extern struct dentry *rcfs_rootde;
+extern struct rbce_eng_callback rcfs_eng_callbacks;
+
+#endif /* _LINUX_RCFS_H */
Index: linux-2.6.12-ckrm1/include/linux/sched.h
===================================================================
--- linux-2.6.12-ckrm1.orig/include/linux/sched.h 2005-06-20 13:08:27.000000000 -0700
+++ linux-2.6.12-ckrm1/include/linux/sched.h 2005-06-20 13:08:29.000000000 -0700
@@ -744,6 +744,11 @@ struct task_struct {
#ifdef CONFIG_DELAY_ACCT
struct task_delay_info delays;
#endif
+#ifdef CONFIG_CKRM
+ spinlock_t ckrm_tsklock;
+ void *ce_data;
+#endif
+
};

static inline pid_t process_group(struct task_struct *tsk)
Index: linux-2.6.12-ckrm1/init/main.c
===================================================================
--- linux-2.6.12-ckrm1.orig/init/main.c 2005-06-17 12:48:29.000000000 -0700
+++ linux-2.6.12-ckrm1/init/main.c 2005-06-20 13:08:29.000000000 -0700
@@ -47,6 +47,7 @@
#include <linux/rmap.h>
#include <linux/mempolicy.h>
#include <linux/key.h>
+#include <linux/ckrm_events.h>

#include <asm/io.h>
#include <asm/bugs.h>
@@ -465,6 +466,7 @@ asmlinkage void __init start_kernel(void
rcu_init();
init_IRQ();
pidhash_init();
+ ckrm_init();
init_timers();
softirq_init();
time_init();
Index: linux-2.6.12-ckrm1/kernel/ckrm/ckrm.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/ckrm.c 2005-06-20 13:08:29.000000000 -0700
@@ -0,0 +1,892 @@
+/* ckrm.c - Class-based Kernel Resource Management (CKRM)
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003, 2004
+ * (C) Shailabh Nagar, IBM Corp. 2003, 2004
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Vivek Kashyap, IBM Corp. 2004
+ *
+ *
+ * Provides kernel API of CKRM for in-kernel,per-resource controllers
+ * (one each for cpu, memory, io, network) and callbacks for
+ * classification modules.
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/ckrm_rc.h>
+#include <linux/rcfs.h>
+#include <net/sock.h>
+#include <linux/ip.h>
+
+#include <asm/uaccess.h>
+#include <asm/errno.h>
+
+rwlock_t ckrm_class_lock; /* protects classlists */
+
+struct rcfs_functions rcfs_fn;
+EXPORT_SYMBOL_GPL(rcfs_fn);
+
+int rcfs_engine_regd; /* rcfs state needed by another module */
+EXPORT_SYMBOL_GPL(rcfs_engine_regd);
+
+int rcfs_mounted;
+EXPORT_SYMBOL_GPL(rcfs_mounted);
+
+/*
+ * Helper Functions
+ */
+
+/*
+ * Return non-zero if the given resource is registered.
+ */
+inline unsigned int ckrm_is_res_regd(struct ckrm_classtype *clstype, int resid)
+{
+ return ((resid >= 0) && (resid < clstype->max_resid) &&
+ test_bit(resid, &clstype->bit_res_ctlrs)
+ );
+}
+
+/*
+ * Return non-zero if the given core class pointer is valid.
+ */
+struct ckrm_res_ctlr *ckrm_resctlr_lookup(struct ckrm_classtype *clstype,
+ const char *resname)
+{
+ int resid = -1;
+
+ if (!clstype || !resname)
+ return NULL;
+ for (resid = 0; resid < clstype->max_resid; resid++) {
+ if (test_bit(resid, &clstype->bit_res_ctlrs)) {
+ struct ckrm_res_ctlr *rctrl = clstype->res_ctlrs[resid];
+ if (!strncmp(resname, rctrl->res_name,
+ CKRM_MAX_RES_NAME))
+ return rctrl;
+ }
+ }
+ return NULL;
+}
+
+EXPORT_SYMBOL_GPL(ckrm_resctlr_lookup);
+
+/* given a classname return the class handle and its classtype*/
+void *ckrm_classobj(char *classname, int *classtype_id)
+{
+ int i;
+
+ *classtype_id = -1;
+ if (!classname || !*classname) {
+ return NULL;
+ }
+
+ read_lock(&ckrm_class_lock);
+ for (i = 0; i < CKRM_MAX_CLASSTYPES; i++) {
+ struct ckrm_classtype *ctype = ckrm_classtypes[i];
+ struct ckrm_core_class *core;
+
+ if (ctype == NULL)
+ continue;
+ list_for_each_entry(core, &ctype->classes, clslist) {
+ if (core->name && !strcmp(core->name, classname)) {
+ /* FIXME: should grep reference. */
+ *classtype_id = ctype->type_id;
+ return core;
+ }
+ }
+ }
+ read_unlock(&ckrm_class_lock);
+ return NULL;
+}
+
+EXPORT_SYMBOL_GPL(ckrm_is_res_regd);
+EXPORT_SYMBOL_GPL(ckrm_classobj);
+
+/*
+ * Internal Functions/macros
+ */
+
+static inline void set_callbacks_active(struct ckrm_classtype *ctype)
+{
+ ctype->ce_cb_active = ((atomic_read(&ctype->ce_regd) > 0) &&
+ (ctype->ce_callbacks.always_callback
+ || (ctype->num_classes > 1)));
+}
+
+int ckrm_validate_and_grab_core(struct ckrm_core_class *core)
+{
+ int rc = 0;
+ read_lock(&ckrm_class_lock);
+ if (likely(ckrm_is_core_valid(core))) {
+ ckrm_core_grab(core);
+ rc = 1;
+ }
+ read_unlock(&ckrm_class_lock);
+ return rc;
+}
+
+/*
+ * Interfaces for classification engine
+ */
+
+/*
+ * Registering a callback structure by the classification engine.
+ *
+ * Returns typeId of class on success -errno for failure.
+ */
+int ckrm_register_engine(const char *typename, struct ckrm_eng_callback * ecbs)
+{
+ struct ckrm_classtype *ctype;
+
+ ctype = ckrm_find_classtype_by_name(typename);
+ if (ctype == NULL)
+ return (-ENOENT);
+
+ atomic_inc(&ctype->ce_regd);
+
+ /* another engine registered or trying to register ? */
+ if (atomic_read(&ctype->ce_regd) != 1) {
+ atomic_dec(&ctype->ce_regd);
+ return (-EBUSY);
+ }
+
+ /*
+ * One of the following must be set:
+ * classify, class_delete (due to object reference) or
+ * notify (case where notification supported but not classification)
+ * The function pointer must be set the momement the mask is non-null
+ */
+ if (!(((ecbs->classify) && (ecbs->class_delete)) || (ecbs->notify)) ||
+ (ecbs->c_interest && ecbs->classify == NULL) ||
+ (ecbs->n_interest && ecbs->notify == NULL)) {
+ atomic_dec(&ctype->ce_regd);
+ return -EINVAL;
+ }
+
+ ctype->ce_callbacks = *ecbs;
+ set_callbacks_active(ctype);
+
+ if (ctype->ce_callbacks.class_add) {
+ struct ckrm_core_class *core;
+
+ read_lock(&ckrm_class_lock);
+ list_for_each_entry(core, &ctype->classes, clslist) {
+ (*ctype->ce_callbacks.class_add) (core->name, core,
+ ctype->type_id);
+ }
+ read_unlock(&ckrm_class_lock);
+ }
+ return ctype->type_id;
+}
+
+/*
+ * Unregistering a callback structure by the classification engine.
+ *
+ * Returns 0 on success -errno for failure.
+ */
+int ckrm_unregister_engine(const char *typename)
+{
+ struct ckrm_classtype *ctype;
+
+ ctype = ckrm_find_classtype_by_name(typename);
+ if (ctype == NULL)
+ return (-ENOENT);
+
+ ctype->ce_cb_active = 0;
+ if (atomic_read(&ctype->ce_nr_users) > 1) {
+ /* Somebody is currently using the engine, cannot deregister. */
+ return (-EAGAIN);
+ }
+ atomic_set(&ctype->ce_regd, 0);
+ memset(&ctype->ce_callbacks, 0, sizeof(struct ckrm_eng_callback));
+ return 0;
+}
+
+/*
+ * Interfaces to manipulate class (core or resource) hierarchies
+ */
+
+static void
+ckrm_add_child(struct ckrm_core_class *parent, struct ckrm_core_class *child)
+{
+ struct ckrm_hnode *cnode = &child->hnode;
+
+ if (!ckrm_is_core_valid(child)) {
+ printk(KERN_ERR "Invalid child %p given in ckrm_add_child\n",
+ child);
+ return;
+ }
+ class_lock(child);
+ INIT_LIST_HEAD(&cnode->children);
+ INIT_LIST_HEAD(&cnode->siblings);
+
+ if (parent) {
+ struct ckrm_hnode *pnode;
+
+ if (!ckrm_is_core_valid(parent)) {
+ printk(KERN_ERR
+ "Invalid parent %p given in ckrm_add_child\n",
+ parent);
+ parent = NULL;
+ } else {
+ pnode = &parent->hnode;
+ write_lock(&parent->hnode_rwlock);
+ list_add(&cnode->siblings, &pnode->children);
+ write_unlock(&parent->hnode_rwlock);
+ }
+ }
+ cnode->parent = parent;
+ class_unlock(child);
+ return;
+}
+
+static int ckrm_remove_child(struct ckrm_core_class *child)
+{
+ struct ckrm_hnode *cnode, *pnode;
+ struct ckrm_core_class *parent;
+
+ if (!ckrm_is_core_valid(child)) {
+ printk(KERN_ERR "Invalid child %p given"
+ " in ckrm_remove_child\n",
+ child);
+ return 0;
+ }
+
+ cnode = &child->hnode;
+ parent = cnode->parent;
+ if (!ckrm_is_core_valid(parent)) {
+ printk(KERN_ERR "Invalid parent %p in ckrm_remove_child\n",
+ parent);
+ return 0;
+ }
+
+ pnode = &parent->hnode;
+
+ class_lock(child);
+ /* ensure that the node does not have children */
+ if (!list_empty(&cnode->children)) {
+ class_unlock(child);
+ return 0;
+ }
+ write_lock(&parent->hnode_rwlock);
+ list_del(&cnode->siblings);
+ write_unlock(&parent->hnode_rwlock);
+ cnode->parent = NULL;
+ class_unlock(child);
+ return 1;
+}
+
+void ckrm_lock_hier(struct ckrm_core_class *parent)
+{
+ if (ckrm_is_core_valid(parent)) {
+ read_lock(&parent->hnode_rwlock);
+ }
+}
+
+void ckrm_unlock_hier(struct ckrm_core_class *parent)
+{
+ if (ckrm_is_core_valid(parent)) {
+ read_unlock(&parent->hnode_rwlock);
+ }
+}
+
+/*
+ * hnode_rwlock of the parent core class must held in read mode.
+ * external callers should 've called ckrm_lock_hier before calling this
+ * function.
+ */
+#define hnode_2_core(ptr) \
+((ptr)? container_of(ptr, struct ckrm_core_class, hnode) : NULL)
+
+struct ckrm_core_class *ckrm_get_next_child(struct ckrm_core_class *parent,
+ struct ckrm_core_class *child)
+{
+ struct list_head *cnode;
+ struct ckrm_hnode *next_cnode;
+ struct ckrm_core_class *next_childcore;
+
+ if (!ckrm_is_core_valid(parent)) {
+ printk(KERN_ERR "Invalid parent %p in ckrm_get_next_child\n",
+ parent);
+ return NULL;
+ }
+ if (list_empty(&parent->hnode.children)) {
+ return NULL;
+ }
+ if (child) {
+ if (!ckrm_is_core_valid(child)) {
+ printk(KERN_ERR
+ "Invalid child %p in ckrm_get_next_child\n",
+ child);
+ return NULL;
+ }
+ cnode = child->hnode.siblings.next;
+ } else {
+ cnode = parent->hnode.children.next;
+ }
+
+ if (cnode == &parent->hnode.children) { /* back at the anchor */
+ return NULL;
+ }
+
+ next_cnode = container_of(cnode, struct ckrm_hnode, siblings);
+ next_childcore = hnode_2_core(next_cnode);
+
+ if (!ckrm_is_core_valid(next_childcore)) {
+ printk(KERN_ERR
+ "Invalid next child %p in ckrm_get_next_child\n",
+ next_childcore);
+ return NULL;
+ }
+ return next_childcore;
+}
+
+EXPORT_SYMBOL_GPL(ckrm_lock_hier);
+EXPORT_SYMBOL_GPL(ckrm_unlock_hier);
+EXPORT_SYMBOL_GPL(ckrm_get_next_child);
+
+static void
+ckrm_alloc_res_class(struct ckrm_core_class *core,
+ struct ckrm_core_class *parent, int resid)
+{
+
+ struct ckrm_classtype *clstype;
+ /*
+ * Allocate a resource class only if the resource controller has
+ * registered with core and the engine requests for the class.
+ */
+ if (!ckrm_is_core_valid(core))
+ return;
+ clstype = core->classtype;
+ core->res_class[resid] = NULL;
+
+ if (test_bit(resid, &clstype->bit_res_ctlrs)) {
+ struct ckrm_res_ctlr *rcbs;
+
+ atomic_inc(&clstype->nr_resusers[resid]);
+ rcbs = clstype->res_ctlrs[resid];
+
+ if (rcbs && rcbs->res_alloc) {
+ core->res_class[resid] =
+ (*rcbs->res_alloc) (core, parent);
+ if (core->res_class[resid])
+ return;
+ printk(KERN_ERR "Error creating res class\n");
+ }
+ atomic_dec(&clstype->nr_resusers[resid]);
+ }
+}
+
+/*
+ * Initialize a core class
+ *
+ */
+
+int
+ckrm_init_core_class(struct ckrm_classtype *clstype,
+ struct ckrm_core_class *dcore,
+ struct ckrm_core_class *parent, const char *name)
+{
+ /* TODO: Should replace name with dentry or add dentry? */
+ int i;
+
+ /* TODO: How is this used in initialization? */
+ pr_debug("name %s => %p\n", name ? name : "default", dcore);
+ if ((dcore != clstype->default_class) && (!ckrm_is_core_valid(parent))){
+ printk(KERN_NOTICE "error not a valid parent %p\n", parent);
+ return -EINVAL;
+ }
+ dcore->classtype = clstype;
+ dcore->magic = CKRM_CORE_MAGIC;
+ dcore->name = name;
+ dcore->class_lock = SPIN_LOCK_UNLOCKED;
+ dcore->hnode_rwlock = RW_LOCK_UNLOCKED;
+ dcore->delayed = 0;
+
+ atomic_set(&dcore->refcnt, 0);
+ write_lock(&ckrm_class_lock);
+
+ INIT_LIST_HEAD(&dcore->objlist);
+ list_add_tail(&dcore->clslist, &clstype->classes);
+
+ clstype->num_classes++;
+ set_callbacks_active(clstype);
+
+ write_unlock(&ckrm_class_lock);
+ ckrm_add_child(parent, dcore);
+
+ for (i = 0; i < clstype->max_resid; i++)
+ ckrm_alloc_res_class(dcore, parent, i);
+
+ /* fix for race condition seen in stress with numtasks */
+ if (parent)
+ ckrm_core_grab(parent);
+
+ ckrm_core_grab(dcore);
+ return 0;
+}
+
+static void ckrm_free_res_class(struct ckrm_core_class *core, int resid)
+{
+ /*
+ * Free a resource class only if the resource controller has
+ * registered with core
+ */
+ if (core->res_class[resid]) {
+ struct ckrm_res_ctlr *rcbs;
+ struct ckrm_classtype *clstype = core->classtype;
+
+ atomic_inc(&clstype->nr_resusers[resid]);
+ rcbs = clstype->res_ctlrs[resid];
+
+ if (rcbs->res_free) {
+ (*rcbs->res_free) (core->res_class[resid]);
+ /* compensate inc in alloc */
+ atomic_dec(&clstype->nr_resusers[resid]);
+ }
+ atomic_dec(&clstype->nr_resusers[resid]);
+ }
+ core->res_class[resid] = NULL;
+}
+
+/*
+ * Free a core class
+ * requires that all tasks were previously reassigned to another class
+ *
+ * Returns 0 on success -errno on failure.
+ */
+
+void ckrm_free_core_class(struct ckrm_core_class *core)
+{
+ int i;
+ struct ckrm_classtype *clstype = core->classtype;
+ struct ckrm_core_class *parent = core->hnode.parent;
+
+ pr_debug("core=%p:%s parent=%p:%s\n", core, core->name, parent,
+ parent->name);
+ if (core->delayed) {
+ /* this core was marked as late */
+ printk("class <%s> finally deleted %lu\n", core->name, jiffies);
+ }
+ if (ckrm_remove_child(core) == 0) {
+ printk("Core class removal failed. Chilren present\n");
+ }
+ for (i = 0; i < clstype->max_resid; i++) {
+ ckrm_free_res_class(core, i);
+ }
+
+ write_lock(&ckrm_class_lock);
+ /* Clear the magic, so we would know if this core is reused. */
+ core->magic = 0;
+#if 0 /* Dynamic not yet enabled */
+ core->res_class = NULL;
+#endif
+ /* Remove this core class from its linked list. */
+ list_del(&core->clslist);
+ clstype->num_classes--;
+ set_callbacks_active(clstype);
+ write_unlock(&ckrm_class_lock);
+
+ /* fix for race condition seen in stress with numtasks */
+ if (parent)
+ ckrm_core_drop(parent);
+
+ kfree(core);
+}
+
+int ckrm_release_core_class(struct ckrm_core_class *core)
+{
+ if (!ckrm_is_core_valid(core)) /* Invalid core */
+ return -EINVAL;
+
+ if (core == core->classtype->default_class)
+ return 0;
+
+ /* need to make sure that the classgot really dropped */
+ if (atomic_read(&core->refcnt) != 1) {
+ pr_debug("class <%s> deletion delayed refcnt=%d jif=%ld\n",
+ core->name, atomic_read(&core->refcnt), jiffies);
+ core->delayed = 1; /* just so we have a ref point */
+ }
+ ckrm_core_drop(core);
+ return 0;
+}
+
+/*
+ * Interfaces for the resource controller
+ */
+/*
+ * Registering a callback structure by the resource controller.
+ *
+ * Returns the resource id(0 or +ve) on success, -errno for failure.
+ */
+static int
+ckrm_register_res_ctlr_intern(struct ckrm_classtype *clstype,
+ struct ckrm_res_ctlr * rcbs)
+{
+ int resid, ret, i;
+
+ if (!rcbs)
+ return -EINVAL;
+
+ resid = rcbs->resid;
+
+ spin_lock(&clstype->res_ctlrs_lock);
+ printk(KERN_WARNING "resid is %d name is %s %s\n",
+ resid, rcbs->res_name, clstype->res_ctlrs[resid]->res_name);
+ if (resid >= 0) {
+ if ((resid < CKRM_MAX_RES_CTLRS)
+ && (clstype->res_ctlrs[resid] == NULL)) {
+ clstype->res_ctlrs[resid] = rcbs;
+ atomic_set(&clstype->nr_resusers[resid], 0);
+ set_bit(resid, &clstype->bit_res_ctlrs);
+ ret = resid;
+ if (resid >= clstype->max_resid) {
+ clstype->max_resid = resid + 1;
+ }
+ } else {
+ ret = -EBUSY;
+ }
+ spin_unlock(&clstype->res_ctlrs_lock);
+ return ret;
+ }
+ for (i = clstype->resid_reserved; i < clstype->max_res_ctlrs; i++) {
+ if (clstype->res_ctlrs[i] == NULL) {
+ clstype->res_ctlrs[i] = rcbs;
+ rcbs->resid = i;
+ atomic_set(&clstype->nr_resusers[i], 0);
+ set_bit(i, &clstype->bit_res_ctlrs);
+ if (i >= clstype->max_resid) {
+ clstype->max_resid = i + 1;
+ }
+ spin_unlock(&clstype->res_ctlrs_lock);
+ return i;
+ }
+ }
+ spin_unlock(&clstype->res_ctlrs_lock);
+ return (-ENOMEM);
+}
+
+int
+ckrm_register_res_ctlr(struct ckrm_classtype *clstype, struct ckrm_res_ctlr *rcbs)
+{
+ struct ckrm_core_class *core;
+ int resid;
+
+ resid = ckrm_register_res_ctlr_intern(clstype, rcbs);
+
+ if (resid >= 0) {
+ /* run through all classes and create the resource class
+ * object and if necessary "initialize" class in context
+ * of this resource
+ */
+ read_lock(&ckrm_class_lock);
+ list_for_each_entry(core, &clstype->classes, clslist) {
+ printk("CKRM .. create res clsobj for resouce <%s>"
+ "class <%s> par=%p\n", rcbs->res_name,
+ core->name, core->hnode.parent);
+ ckrm_alloc_res_class(core, core->hnode.parent, resid);
+
+ if (clstype->add_resctrl) {
+ /* FIXME: this should be mandatory */
+ (*clstype->add_resctrl) (core, resid);
+ }
+ }
+ read_unlock(&ckrm_class_lock);
+ }
+ return resid;
+}
+
+/*
+ * Unregistering a callback structure by the resource controller.
+ *
+ * Returns 0 on success -errno for failure.
+ */
+int ckrm_unregister_res_ctlr(struct ckrm_res_ctlr *rcbs)
+{
+ struct ckrm_classtype *clstype = rcbs->classtype;
+ struct ckrm_core_class *core = NULL;
+ int resid = rcbs->resid;
+
+ if ((clstype == NULL) || (resid < 0)) {
+ return -EINVAL;
+ }
+ /* TODO: probably need to also call deregistration function */
+
+ read_lock(&ckrm_class_lock);
+ /* free up this resource from all the classes */
+ list_for_each_entry(core, &clstype->classes, clslist) {
+ ckrm_free_res_class(core, resid);
+ }
+ read_unlock(&ckrm_class_lock);
+
+ if (atomic_read(&clstype->nr_resusers[resid])) {
+ return -EBUSY;
+ }
+
+ spin_lock(&clstype->res_ctlrs_lock);
+ clstype->res_ctlrs[resid] = NULL;
+ clear_bit(resid, &clstype->bit_res_ctlrs);
+ clstype->max_resid = fls(clstype->bit_res_ctlrs);
+ rcbs->resid = -1;
+ spin_unlock(&clstype->res_ctlrs_lock);
+
+ return 0;
+}
+
+/*
+ * Class Type Registration
+ */
+
+/* TODO: What locking is needed here?*/
+
+struct ckrm_classtype *ckrm_classtypes[CKRM_MAX_CLASSTYPES];
+EXPORT_SYMBOL_GPL(ckrm_classtypes);
+
+int ckrm_register_classtype(struct ckrm_classtype *clstype)
+{
+ int tid = clstype->type_id;
+
+ if (tid != -1) {
+ if ((tid < 0) || (tid > CKRM_MAX_CLASSTYPES)
+ || (ckrm_classtypes[tid]))
+ return -EINVAL;
+ } else {
+ int i;
+ for (i = CKRM_RESV_CLASSTYPES; i < CKRM_MAX_CLASSTYPES; i++) {
+ if (ckrm_classtypes[i] == NULL) {
+ tid = i;
+ break;
+ }
+ }
+ }
+ if (tid == -1)
+ return -EBUSY;
+ clstype->type_id = tid;
+ ckrm_classtypes[tid] = clstype;
+
+ /* TODO: Need to call the callbacks of the RCFS client */
+ if (rcfs_fn.register_classtype) {
+ (*rcfs_fn.register_classtype) (clstype);
+ /* No error return for now. */
+ }
+ return tid;
+}
+
+int ckrm_unregister_classtype(struct ckrm_classtype *clstype)
+{
+ int tid = clstype->type_id;
+
+ if ((tid < 0) || (tid > CKRM_MAX_CLASSTYPES)
+ || (ckrm_classtypes[tid] != clstype))
+ return -EINVAL;
+
+ if (rcfs_fn.deregister_classtype) {
+ (*rcfs_fn.deregister_classtype) (clstype);
+ /* No error return for now */
+ }
+
+ ckrm_classtypes[tid] = NULL;
+ clstype->type_id = -1;
+ return 0;
+}
+
+struct ckrm_classtype *ckrm_find_classtype_by_name(const char *name)
+{
+ int i;
+ for (i = 0; i < CKRM_MAX_CLASSTYPES; i++) {
+ struct ckrm_classtype *ctype = ckrm_classtypes[i];
+ if (ctype && !strncmp(ctype->name, name, CKRM_MAX_TYPENAME_LEN))
+ return ctype;
+ }
+ return NULL;
+}
+
+/*
+ * Generic Functions that can be used as default functions
+ * in almost all classtypes
+ * (a) function iterator over all resource classes of a class
+ * (b) function invoker on a named resource
+ */
+
+int ckrm_class_show_shares(struct ckrm_core_class *core, struct seq_file *seq)
+{
+ int i;
+ struct ckrm_res_ctlr *rcbs;
+ struct ckrm_classtype *clstype = core->classtype;
+ struct ckrm_shares shares;
+
+ for (i = 0; i < clstype->max_resid; i++) {
+ atomic_inc(&clstype->nr_resusers[i]);
+ rcbs = clstype->res_ctlrs[i];
+ if (rcbs && rcbs->get_share_values) {
+ (*rcbs->get_share_values) (core->res_class[i], &shares);
+ seq_printf(seq,"res=%s,guarantee=%d,limit=%d,"
+ "total_guarantee=%d,max_limit=%d\n",
+ rcbs->res_name, shares.my_guarantee,
+ shares.my_limit, shares.total_guarantee,
+ shares.max_limit);
+ }
+ atomic_dec(&clstype->nr_resusers[i]);
+ }
+ return 0;
+}
+
+int ckrm_class_show_stats(struct ckrm_core_class *core, struct seq_file *seq)
+{
+ int i;
+ struct ckrm_res_ctlr *rcbs;
+ struct ckrm_classtype *clstype = core->classtype;
+
+ for (i = 0; i < clstype->max_resid; i++) {
+ atomic_inc(&clstype->nr_resusers[i]);
+ rcbs = clstype->res_ctlrs[i];
+ if (rcbs && rcbs->get_stats)
+ (*rcbs->get_stats) (core->res_class[i], seq);
+ atomic_dec(&clstype->nr_resusers[i]);
+ }
+ return 0;
+}
+
+int ckrm_class_show_config(struct ckrm_core_class *core, struct seq_file *seq)
+{
+ int i;
+ struct ckrm_res_ctlr *rcbs;
+ struct ckrm_classtype *clstype = core->classtype;
+
+ for (i = 0; i < clstype->max_resid; i++) {
+ atomic_inc(&clstype->nr_resusers[i]);
+ rcbs = clstype->res_ctlrs[i];
+ if (rcbs && rcbs->show_config)
+ (*rcbs->show_config) (core->res_class[i], seq);
+ atomic_dec(&clstype->nr_resusers[i]);
+ }
+ return 0;
+}
+
+int ckrm_class_set_config(struct ckrm_core_class *core, const char *resname,
+ const char *cfgstr)
+{
+ struct ckrm_classtype *clstype = core->classtype;
+ struct ckrm_res_ctlr *rcbs = ckrm_resctlr_lookup(clstype, resname);
+ int rc;
+
+ if (rcbs == NULL || rcbs->set_config == NULL)
+ return -EINVAL;
+ rc = (*rcbs->set_config) (core->res_class[rcbs->resid], cfgstr);
+ return rc;
+}
+
+#define legalshare(a) \
+ ( ((a) >=0) \
+ || ((a) == CKRM_SHARE_UNCHANGED) \
+ || ((a) == CKRM_SHARE_DONTCARE) )
+
+int ckrm_class_set_shares(struct ckrm_core_class *core, const char *resname,
+ struct ckrm_shares *shares)
+{
+ struct ckrm_classtype *clstype = core->classtype;
+ struct ckrm_res_ctlr *rcbs;
+ int rc;
+
+ /* Check for legal values */
+ if (!legalshare(shares->my_guarantee) || !legalshare(shares->my_limit)
+ || !legalshare(shares->total_guarantee)
+ || !legalshare(shares->max_limit))
+ return -EINVAL;
+
+ rcbs = ckrm_resctlr_lookup(clstype, resname);
+ if (rcbs == NULL || rcbs->set_share_values == NULL)
+ return -EINVAL;
+ rc = (*rcbs->set_share_values) (core->res_class[rcbs->resid], shares);
+ return rc;
+}
+
+int ckrm_class_reset_stats(struct ckrm_core_class *core, const char *resname,
+ const char *unused)
+{
+ struct ckrm_classtype *clstype = core->classtype;
+ struct ckrm_res_ctlr *rcbs = ckrm_resctlr_lookup(clstype, resname);
+ int rc;
+
+ if (rcbs == NULL || rcbs->reset_stats == NULL)
+ return -EINVAL;
+ rc = (*rcbs->reset_stats) (core->res_class[rcbs->resid]);
+ return rc;
+}
+
+/*
+ * Initialization
+ */
+
+void __init ckrm_init(void)
+{
+ printk("CKRM Initialization\n");
+ rwlock_init(&ckrm_class_lock);
+
+ /* register/initialize the Metatypes */
+
+#ifdef CONFIG_CKRM_TYPE_TASKCLASS
+ {
+ extern void ckrm_meta_init_taskclass(void);
+ ckrm_meta_init_taskclass();
+ }
+#endif
+#ifdef CONFIG_CKRM_TYPE_SOCKETCLASS
+ {
+ extern void ckrm_meta_init_sockclass(void);
+ ckrm_meta_init_sockclass();
+ }
+#endif
+ /* prepare init_task and then rely on inheritance of properties */
+ ckrm_cb_newtask(&init_task);
+ printk("CKRM Initialization done\n");
+}
+
+EXPORT_SYMBOL_GPL(ckrm_register_engine);
+EXPORT_SYMBOL_GPL(ckrm_unregister_engine);
+
+EXPORT_SYMBOL_GPL(ckrm_register_res_ctlr);
+EXPORT_SYMBOL_GPL(ckrm_unregister_res_ctlr);
+
+EXPORT_SYMBOL_GPL(ckrm_init_core_class);
+EXPORT_SYMBOL_GPL(ckrm_free_core_class);
+EXPORT_SYMBOL_GPL(ckrm_release_core_class);
+
+EXPORT_SYMBOL_GPL(ckrm_register_classtype);
+EXPORT_SYMBOL_GPL(ckrm_unregister_classtype);
+EXPORT_SYMBOL_GPL(ckrm_find_classtype_by_name);
+
+EXPORT_SYMBOL_GPL(ckrm_core_grab);
+EXPORT_SYMBOL_GPL(ckrm_core_drop);
+EXPORT_SYMBOL_GPL(ckrm_is_core_valid);
+EXPORT_SYMBOL_GPL(ckrm_validate_and_grab_core);
+
+EXPORT_SYMBOL_GPL(ckrm_register_event_set);
+EXPORT_SYMBOL_GPL(ckrm_unregister_event_set);
+EXPORT_SYMBOL_GPL(ckrm_register_event_cb);
+EXPORT_SYMBOL_GPL(ckrm_unregister_event_cb);
+
+EXPORT_SYMBOL_GPL(ckrm_class_show_stats);
+EXPORT_SYMBOL_GPL(ckrm_class_show_config);
+EXPORT_SYMBOL_GPL(ckrm_class_show_shares);
+
+EXPORT_SYMBOL_GPL(ckrm_class_set_config);
+EXPORT_SYMBOL_GPL(ckrm_class_set_shares);
+
+EXPORT_SYMBOL_GPL(ckrm_class_reset_stats);
Index: linux-2.6.12-ckrm1/kernel/ckrm/ckrmutils.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/ckrmutils.c 2005-06-20 13:08:29.000000000 -0700
@@ -0,0 +1,188 @@
+/*
+ * ckrmutils.c - Utility functions for CKRM
+ *
+ * Copyright (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Hubertus Franke , IBM Corp. 2004
+ *
+ * Provides simple utility functions for the core module, CE and resource
+ * controllers.
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/mm.h>
+#include <linux/err.h>
+#include <linux/mount.h>
+#include <linux/module.h>
+#include <linux/ckrm_rc.h>
+
+int get_exe_path_name(struct task_struct *tsk, char *buf, int buflen)
+{
+ struct vm_area_struct *vma;
+ struct vfsmount *mnt;
+ struct mm_struct *mm = get_task_mm(tsk);
+ struct dentry *dentry;
+ char *lname;
+ int rc = 0;
+
+ *buf = '\0';
+ if (!mm) {
+ return -EINVAL;
+ }
+ down_read(&mm->mmap_sem);
+ vma = mm->mmap;
+ while (vma) {
+ if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
+ dentry = dget(vma->vm_file->f_dentry);
+ mnt = mntget(vma->vm_file->f_vfsmnt);
+ lname = d_path(dentry, mnt, buf, buflen);
+ if (!IS_ERR(lname)) {
+ strncpy(buf, lname, strlen(lname) + 1);
+ } else {
+ rc = (int)PTR_ERR(lname);
+ }
+ mntput(mnt);
+ dput(dentry);
+ break;
+ }
+ vma = vma->vm_next;
+ }
+ up_read(&mm->mmap_sem);
+ mmput(mm);
+ return rc;
+}
+
+/*
+ * TODO: Use sparce to enforce cnt_lock.
+ *
+ * must be called with cnt_lock of parres held
+ * Caller is responsible for making sure that the new guarantee doesn't
+ * overflow parent's total guarantee.
+ */
+void child_guarantee_changed(struct ckrm_shares *parent, int cur, int new)
+{
+ if (new == cur || !parent) {
+ return;
+ }
+ if (new != CKRM_SHARE_DONTCARE) {
+ parent->unused_guarantee -= new;
+ }
+ if (cur != CKRM_SHARE_DONTCARE) {
+ parent->unused_guarantee += cur;
+ }
+ return;
+}
+
+/*
+ * must be called with cnt_lock of parres held
+ * Caller is responsible for making sure that the new limit is not more
+ * than parent's max_limit
+ */
+void child_maxlimit_changed(struct ckrm_shares *parent, int new_limit)
+{
+ if (parent && parent->cur_max_limit < new_limit) {
+ parent->cur_max_limit = new_limit;
+ }
+ return;
+}
+
+/*
+ * Caller is responsible for holding any lock to protect the data
+ * structures passed to this function
+ */
+int
+set_shares(struct ckrm_shares *new, struct ckrm_shares *cur,
+ struct ckrm_shares *par)
+{
+ int rc = -EINVAL;
+ int cur_usage_guar = cur->total_guarantee - cur->unused_guarantee;
+ int increase_by = new->my_guarantee - cur->my_guarantee;
+
+ /* Check total_guarantee for correctness */
+ if (new->total_guarantee <= CKRM_SHARE_DONTCARE) {
+ goto set_share_err;
+ } else if (new->total_guarantee == CKRM_SHARE_UNCHANGED) {
+ /* do nothing */;
+ } else if (cur_usage_guar > new->total_guarantee) {
+ goto set_share_err;
+ }
+ /* Check max_limit for correctness */
+ if (new->max_limit <= CKRM_SHARE_DONTCARE) {
+ goto set_share_err;
+ } else if (new->max_limit == CKRM_SHARE_UNCHANGED) {
+ /* do nothing */;
+ } else if (cur->cur_max_limit > new->max_limit) {
+ goto set_share_err;
+ }
+ /* Check my_guarantee for correctness */
+ if (new->my_guarantee == CKRM_SHARE_UNCHANGED) {
+ /* do nothing */;
+ } else if (new->my_guarantee == CKRM_SHARE_DONTCARE) {
+ /* do nothing */;
+ } else if (par && increase_by > par->unused_guarantee) {
+ goto set_share_err;
+ }
+ /* Check my_limit for correctness */
+ if (new->my_limit == CKRM_SHARE_UNCHANGED) {
+ /* do nothing */;
+ } else if (new->my_limit == CKRM_SHARE_DONTCARE) {
+ /* do nothing */;
+ } else if (par && new->my_limit > par->max_limit) {
+ /* I can't get more limit than my parent's limit */
+ goto set_share_err;
+
+ }
+ /* make sure guarantee is lesser than limit */
+ if (new->my_limit == CKRM_SHARE_DONTCARE) {
+ /* do nothing */;
+ } else if (new->my_limit == CKRM_SHARE_UNCHANGED) {
+ if (new->my_guarantee == CKRM_SHARE_DONTCARE) {
+ /* do nothing */;
+ } else if (new->my_guarantee == CKRM_SHARE_UNCHANGED) {
+ /*
+ * do nothing; earlier setting would have
+ * taken care of it
+ */;
+ } else if (new->my_guarantee > cur->my_limit) {
+ goto set_share_err;
+ }
+ } else { /* new->my_limit has a valid value */
+ if (new->my_guarantee == CKRM_SHARE_DONTCARE) {
+ /* do nothing */;
+ } else if (new->my_guarantee == CKRM_SHARE_UNCHANGED) {
+ if (cur->my_guarantee > new->my_limit) {
+ goto set_share_err;
+ }
+ } else if (new->my_guarantee > new->my_limit) {
+ goto set_share_err;
+ }
+ }
+ if (new->my_guarantee != CKRM_SHARE_UNCHANGED) {
+ child_guarantee_changed(par, cur->my_guarantee,
+ new->my_guarantee);
+ cur->my_guarantee = new->my_guarantee;
+ }
+ if (new->my_limit != CKRM_SHARE_UNCHANGED) {
+ child_maxlimit_changed(par, new->my_limit);
+ cur->my_limit = new->my_limit;
+ }
+ if (new->total_guarantee != CKRM_SHARE_UNCHANGED) {
+ cur->unused_guarantee = new->total_guarantee - cur_usage_guar;
+ cur->total_guarantee = new->total_guarantee;
+ }
+ if (new->max_limit != CKRM_SHARE_UNCHANGED) {
+ cur->max_limit = new->max_limit;
+ }
+ rc = 0;
+set_share_err:
+ return rc;
+}
+
+EXPORT_SYMBOL_GPL(get_exe_path_name);
+EXPORT_SYMBOL_GPL(child_guarantee_changed);
+EXPORT_SYMBOL_GPL(child_maxlimit_changed);
+EXPORT_SYMBOL_GPL(set_shares);
Index: linux-2.6.12-ckrm1/kernel/ckrm/Makefile
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/Makefile 2005-06-20 13:08:20.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/Makefile 2005-06-20 13:08:29.000000000 -0700
@@ -2,4 +2,4 @@
# Makefile for CKRM
#

-obj-y := ckrm_events.o
+obj-y += ckrm_events.o ckrm.o ckrmutils.o
--
-
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