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Subject[RFC patch 03/12] LTTng instrumentation ipc
Interprocess communication, core events.

Added tracepoints :

ipc_msg_create
ipc_sem_create
ipc_shm_create

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: 'Peter Zijlstra' <peterz@infradead.org>
CC: "Frank Ch. Eigler" <fche@redhat.com>
CC: 'Ingo Molnar' <mingo@elte.hu>
CC: 'Hideo AOKI' <haoki@redhat.com>
CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
CC: 'Steven Rostedt' <rostedt@goodmis.org>
---
ipc/ipc-trace.h | 15 +++++++++++++++
ipc/msg.c | 6 +++++-
ipc/sem.c | 6 +++++-
ipc/shm.c | 6 +++++-
4 files changed, 30 insertions(+), 3 deletions(-)
Index: linux-2.6-lttng/ipc/msg.c
===================================================================
--- linux-2.6-lttng.orig/ipc/msg.c 2008-07-03 12:45:36.000000000 -0400
+++ linux-2.6-lttng/ipc/msg.c 2008-07-03 12:47:14.000000000 -0400
@@ -38,6 +38,7 @@
#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/ipc_namespace.h>
+#include "ipc-trace.h"

#include <asm/current.h>
#include <asm/uaccess.h>
@@ -314,6 +315,7 @@ asmlinkage long sys_msgget(key_t key, in
struct ipc_namespace *ns;
struct ipc_ops msg_ops;
struct ipc_params msg_params;
+ long ret;

ns = current->nsproxy->ipc_ns;

@@ -324,7 +326,9 @@ asmlinkage long sys_msgget(key_t key, in
msg_params.key = key;
msg_params.flg = msgflg;

- return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
+ ret = ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
+ trace_ipc_msg_create(ret, msgflg);
+ return ret;
}

static inline unsigned long
Index: linux-2.6-lttng/ipc/sem.c
===================================================================
--- linux-2.6-lttng.orig/ipc/sem.c 2008-07-03 12:45:36.000000000 -0400
+++ linux-2.6-lttng/ipc/sem.c 2008-07-03 12:47:14.000000000 -0400
@@ -83,6 +83,7 @@
#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/ipc_namespace.h>
+#include "ipc-trace.h"

#include <asm/uaccess.h>
#include "util.h"
@@ -314,6 +315,7 @@ asmlinkage long sys_semget(key_t key, in
struct ipc_namespace *ns;
struct ipc_ops sem_ops;
struct ipc_params sem_params;
+ long err;

ns = current->nsproxy->ipc_ns;

@@ -328,7 +330,9 @@ asmlinkage long sys_semget(key_t key, in
sem_params.flg = semflg;
sem_params.u.nsems = nsems;

- return ipcget(ns, &sem_ids(ns), &sem_ops, &sem_params);
+ err = ipcget(ns, &sem_ids(ns), &sem_ops, &sem_params);
+ trace_ipc_sem_create(err, semflg);
+ return err;
}

/* Manage the doubly linked list sma->sem_pending as a FIFO:
Index: linux-2.6-lttng/ipc/shm.c
===================================================================
--- linux-2.6-lttng.orig/ipc/shm.c 2008-07-03 12:45:36.000000000 -0400
+++ linux-2.6-lttng/ipc/shm.c 2008-07-03 12:47:14.000000000 -0400
@@ -39,6 +39,7 @@
#include <linux/nsproxy.h>
#include <linux/mount.h>
#include <linux/ipc_namespace.h>
+#include "ipc-trace.h"

#include <asm/uaccess.h>

@@ -460,6 +461,7 @@ asmlinkage long sys_shmget (key_t key, s
struct ipc_namespace *ns;
struct ipc_ops shm_ops;
struct ipc_params shm_params;
+ long err;

ns = current->nsproxy->ipc_ns;

@@ -471,7 +473,9 @@ asmlinkage long sys_shmget (key_t key, s
shm_params.flg = shmflg;
shm_params.u.size = size;

- return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
+ err = ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
+ trace_ipc_shm_create(err, shmflg);
+ return err;
}

static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
Index: linux-2.6-lttng/ipc/ipc-trace.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-lttng/ipc/ipc-trace.h 2008-07-03 12:47:14.000000000 -0400
@@ -0,0 +1,15 @@
+#ifndef _IPC_TRACE_H
+#define _IPC_TRACE_H
+
+#include <linux/tracepoint.h>
+
+DEFINE_TRACE(ipc_msg_create,
+ TPPROTO(long id, int flags),
+ TPARGS(id, flags));
+DEFINE_TRACE(ipc_sem_create,
+ TPPROTO(long id, int flags),
+ TPARGS(id, flags));
+DEFINE_TRACE(ipc_shm_create,
+ TPPROTO(long id, int flags),
+ TPARGS(id, flags));
+#endif
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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