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    Subject[PATCH 06/12] Add proc interface to get resource group info of task
    06/12: task_procsupport

    Adds an interface in /proc to get the name of a resource group to which
    a task is attached.
    --

    Signed-Off-By: Chandra Seetharaman <sekharan@us.ibm.com>
    Signed-off-by: MAEDA Naoaki <maeda.naoaki@jp.fujitsu.com>

    fs/proc/base.c | 19 +++++++++++++++++++
    include/linux/res_group.h | 2 ++
    kernel/res_group/task.c | 32 +++++++++++++++++++++++++++++++-
    3 files changed, 52 insertions(+), 1 deletion(-)

    Index: linux-2617-rc3/fs/proc/base.c
    ===================================================================
    --- linux-2617-rc3.orig/fs/proc/base.c 2006-04-27 09:18:03.000000000 -0700
    +++ linux-2617-rc3/fs/proc/base.c 2006-04-27 09:22:27.000000000 -0700
    @@ -70,6 +70,7 @@
    #include <linux/ptrace.h>
    #include <linux/seccomp.h>
    #include <linux/cpuset.h>
    +#include <linux/res_group.h>
    #include <linux/audit.h>
    #include <linux/poll.h>
    #include "internal.h"
    @@ -115,6 +116,9 @@ enum pid_directory_inos {
    #ifdef CONFIG_CPUSETS
    PROC_TGID_CPUSET,
    #endif
    +#ifdef CONFIG_RES_GROUPS
    + PROC_TGID_RES_GROUP,
    +#endif
    #ifdef CONFIG_SECURITY
    PROC_TGID_ATTR,
    PROC_TGID_ATTR_CURRENT,
    @@ -156,6 +160,9 @@ enum pid_directory_inos {
    #ifdef CONFIG_CPUSETS
    PROC_TID_CPUSET,
    #endif
    +#ifdef CONFIG_RES_GROUPS
    + PROC_TID_RES_GROUP,
    +#endif
    #ifdef CONFIG_SECURITY
    PROC_TID_ATTR,
    PROC_TID_ATTR_CURRENT,
    @@ -219,6 +226,9 @@ static struct pid_entry tgid_base_stuff[
    #ifdef CONFIG_CPUSETS
    E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
    #endif
    +#ifdef CONFIG_RES_GROUPS
    + E(PROC_TGID_RES_GROUP,"res_group",S_IFREG|S_IRUGO),
    +#endif
    E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
    E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
    #ifdef CONFIG_AUDITSYSCALL
    @@ -261,6 +271,9 @@ static struct pid_entry tid_base_stuff[]
    #ifdef CONFIG_CPUSETS
    E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
    #endif
    +#ifdef CONFIG_RES_GROUPS
    + E(PROC_TID_RES_GROUP, "res_group",S_IFREG|S_IRUGO),
    +#endif
    E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
    E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
    #ifdef CONFIG_AUDITSYSCALL
    @@ -1823,6 +1836,12 @@ static struct dentry *proc_pident_lookup
    inode->i_fop = &proc_cpuset_operations;
    break;
    #endif
    +#ifdef CONFIG_RES_GROUPS
    + case PROC_TID_RES_GROUP:
    + case PROC_TGID_RES_GROUP:
    + inode->i_fop = &proc_res_group_operations;
    + break;
    +#endif
    case PROC_TID_OOM_SCORE:
    case PROC_TGID_OOM_SCORE:
    inode->i_fop = &proc_info_file_operations;
    Index: linux-2617-rc3/kernel/res_group/task.c
    ===================================================================
    --- linux-2617-rc3.orig/kernel/res_group/task.c 2006-04-27 09:22:20.000000000 -0700
    +++ linux-2617-rc3/kernel/res_group/task.c 2006-04-27 09:22:27.000000000 -0700
    @@ -13,7 +13,8 @@
    * (at your option) any later version.
    *
    */
    -#include <linux/sched.h>
    +#include <linux/seq_file.h>
    +#include <linux/proc_fs.h>
    #include <linux/module.h>
    #include "local.h"

    @@ -194,4 +195,33 @@ next_task:
    kref_put(&rgroup->ref, release_res_group);
    }

    +static int proc_res_group_show(struct seq_file *m, void *v)
    +{
    + struct task_struct *tsk = m->private;
    + struct resource_group *rgroup = tsk->res_group;
    +
    + if (!rgroup)
    + return -EINVAL;
    +
    + kref_get(&rgroup->ref);
    + seq_puts(m, "/");
    + if (!is_res_group_root(rgroup))
    + seq_puts(m, rgroup->name);
    + seq_putc(m, '\n');
    + kref_put(&rgroup->ref, release_res_group);
    + return 0;
    +}
    +
    +static int res_group_open(struct inode *inode, struct file *file)
    +{
    + struct task_struct *tsk = PROC_I(inode)->task;
    + return single_open(file, proc_res_group_show, tsk);
    +}
    +
    +struct file_operations proc_res_group_operations = {
    + .open = res_group_open,
    + .read = seq_read,
    + .llseek = seq_lseek,
    + .release = single_release,
    +};
    EXPORT_SYMBOL_GPL(set_res_group);
    Index: linux-2617-rc3/include/linux/res_group.h
    ===================================================================
    --- linux-2617-rc3.orig/include/linux/res_group.h 2006-04-27 09:22:20.000000000 -0700
    +++ linux-2617-rc3/include/linux/res_group.h 2006-04-27 09:22:27.000000000 -0700
    @@ -94,6 +94,8 @@ struct resource_group {
    struct list_head children; /* head of children */
    };

    +extern struct file_operations proc_res_group_operations;
    +
    extern void init_task_res_group(struct task_struct *);
    extern void clear_task_res_group(struct task_struct *);
    extern void res_group_init(void);
    --

    ----------------------------------------------------------------------
    Chandra Seetharaman | Be careful what you choose....
    - sekharan@us.ibm.com | .......you may get it.
    ----------------------------------------------------------------------
    -
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