linux-kernel - [RFC PATCH v2] Tracepoint: add exec tracepoint

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Date:	Thu, 03 Nov 2011 10:59:48 -0500
From:	David Smith <dsmith@...hat.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [RFC PATCH v2] Tracepoint: add exec tracepoint

New version corrects 2 small problems.  Include linux/binfmts.h in trace/events/sched.h to provide definition of 'struct linux_binprm'.  To avoid future abi problems, add 'struct task_struct' parameter (like most of the other sched tracepoints have).

---
From: David Smith <dsmith@...hat.com>

Added general purpose exec tracepoint.  The 'bprm' argument gives details of the exec.

Signed-off-by: David Smith <dsmith@...hat.com>
---
 fs/exec.c                    |    6 +++++-
 include/trace/events/sched.h |   23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 25dcbe5..b0f4919 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -61,6 +61,8 @@
 #include <asm/tlb.h>
 #include "internal.h"
 
+#include <trace/events/sched.h>
+
 int core_uses_pid;
 char core_pattern[CORENAME_MAX_SIZE] = "core";
 unsigned int core_pipe_limit;
@@ -1401,9 +1403,11 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
 			 */
 			bprm->recursion_depth = depth;
 			if (retval >= 0) {
-				if (depth == 0)
+				if (depth == 0) {
+					trace_sched_process_exec(current, bprm);
 					ptrace_event(PTRACE_EVENT_EXEC,
 							old_pid);
+				}
 				put_binfmt(fmt);
 				allow_write_access(bprm->file);
 				if (bprm->file)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 959ff18..ca8d084 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -6,6 +6,7 @@
 
 #include <linux/sched.h>
 #include <linux/tracepoint.h>
+#include <linux/binfmts.h>
 
 /*
  * Tracepoint for calling kthread_stop, performed to end a kthread:
@@ -276,6 +277,28 @@ TRACE_EVENT(sched_process_fork,
 );
 
 /*
+ * Tracepoint for exec:
+ */
+TRACE_EVENT(sched_process_exec,
+
+	TP_PROTO(struct task_struct *p, struct linux_binprm *bprm),
+
+	TP_ARGS(p, bprm),
+
+	TP_STRUCT__entry(
+		__string(	filename,	bprm->filename	)
+		__field(	pid_t,		pid		)
+	),
+
+	TP_fast_assign(
+		__assign_str(filename, bprm->filename);
+		__entry->pid	= p->pid;
+	),
+
+	TP_printk("filename=%s pid=%d", __get_str(filename), __entry->pid)
+);
+
+/*
  * XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
  *     adding sched_stat support to SCHED_FIFO/RR would be welcome.
  */
--
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