[meta-ti] Paul Woegerer : linux-omap4-3.1.0: Add sched_process_exec tracing

[Arago Project git]

Module: meta-ti
Branch: master
Commit: c23f472783a5cab482d62c4ed31874c69397dbfe
URL:    http://arago-project.org/git/meta-ti.git?a=commit;h=c23f472783a5cab482d62c4ed31874c69397dbfe

Author: Paul Woegerer <paul_woegerer at mentor.com>
Date:   Fri Oct 12 00:40:24 2012 -0700

linux-omap4-3.1.0: Add sched_process_exec tracing

Signed-off-by: Denys Dmytriyenko <denys at ti.com>

---

 .../linux-omap4-3.1.0/add_exec_tracepoint.patch    |  109 ++++++++++++++++++++
 recipes-kernel/linux/linux-omap4_3.1.0.bb          |    3 +-
 2 files changed, 111 insertions(+), 1 deletions(-)

diff --git a/recipes-kernel/linux/linux-omap4-3.1.0/add_exec_tracepoint.patch b/recipes-kernel/linux/linux-omap4-3.1.0/add_exec_tracepoint.patch
new file mode 100644
index 0000000..0d9a63b
--- /dev/null
+++ b/recipes-kernel/linux/linux-omap4-3.1.0/add_exec_tracepoint.patch
@@ -0,0 +1,109 @@
+From 4ff16c25e2cc48cbe6956e356c38a25ac063a64d Mon Sep 17 00:00:00 2001
+From: David Smith <dsmith at redhat.com>
+Date: Tue, 7 Feb 2012 10:11:05 -0600
+Subject: [PATCH] tracepoint, vfs, sched: Add exec() tracepoint
+
+Added a minimal exec tracepoint. Exec is an important major event
+in the life of a task, like fork(), clone() or exit(), all of
+which we already trace.
+
+[ We also do scheduling re-balancing during exec() - so it's useful
+  from a scheduler instrumentation POV as well. ]
+
+If you want to watch a task start up, when it gets exec'ed is a good place
+to start.  With the addition of this tracepoint, exec's can be monitored
+and better picture of general system activity can be obtained. This
+tracepoint will also enable better process life tracking, allowing you to
+answer questions like "what process keeps starting up binary X?".
+
+This tracepoint can also be useful in ftrace filtering and trigger
+conditions: i.e. starting or stopping filtering when exec is called.
+
+Signed-off-by: David Smith <dsmith at redhat.com>
+Signed-off-by: Peter Zijlstra <a.p.zijlstra at chello.nl>
+Cc: Steven Rostedt <rostedt at goodmis.org>
+Cc: Christoph Hellwig <hch at infradead.org>
+Cc: Al Viro <viro at zeniv.linux.org.uk>
+Cc: Andrew Morton <akpm at linux-foundation.org>
+Cc: Linus Torvalds <torvalds at linux-foundation.org>
+Link: http://lkml.kernel.org/r/4F314D19.7030504@redhat.com
+Signed-off-by: Ingo Molnar <mingo at elte.hu>
+---
+ fs/exec.c                    |    9 ++++++---
+ include/trace/events/sched.h |   27 +++++++++++++++++++++++++++
+ 2 files changed, 33 insertions(+), 3 deletions(-)
+
+diff --git a/fs/exec.c b/fs/exec.c
+index aeb135c..d0d2080 100644
+--- a/fs/exec.c
++++ b/fs/exec.c
+@@ -63,6 +63,8 @@
+ #include <trace/events/task.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 +1403,10 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
+ 			 */
+ 			bprm->recursion_depth = depth;
+ 			if (retval >= 0) {
+-				if (depth == 0)
+-					ptrace_event(PTRACE_EVENT_EXEC,
+-							old_pid);
++				if (depth == 0) {
++					trace_sched_process_exec(current, old_pid, 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 6ba596b..e61ddfe 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 +277,32 @@ TRACE_EVENT(sched_process_fork,
+ );
+ 
+ /*
++ * Tracepoint for exec:
++ */
++TRACE_EVENT(sched_process_exec,
++
++	TP_PROTO(struct task_struct *p, pid_t old_pid,
++		 struct linux_binprm *bprm),
++
++	TP_ARGS(p, old_pid, bprm),
++
++	TP_STRUCT__entry(
++		__string(	filename,	bprm->filename	)
++		__field(	pid_t,		pid		)
++		__field(	pid_t,		old_pid		)
++	),
++
++	TP_fast_assign(
++		__assign_str(filename, bprm->filename);
++		__entry->pid		= p->pid;
++		__entry->old_pid	= p->pid;
++	),
++
++	TP_printk("filename=%s pid=%d old_pid=%d", __get_str(filename),
++		  __entry->pid, __entry->old_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.
+  */
+-- 
+1.7.6.5
diff --git a/recipes-kernel/linux/linux-omap4_3.1.0.bb b/recipes-kernel/linux/linux-omap4_3.1.0.bb
index c57d034..7e67055 100644
--- a/recipes-kernel/linux/linux-omap4_3.1.0.bb
+++ b/recipes-kernel/linux/linux-omap4_3.1.0.bb
@@ -3,7 +3,7 @@ COMPATIBLE_MACHINE = "pandaboard"
 require linux.inc
 
 # The main PR is now using MACHINE_KERNEL_PR, for omap4 see conf/machine/include/omap4.inc
-MACHINE_KERNEL_PR_append = "a"
+MACHINE_KERNEL_PR_append = "b"
 
 CORTEXA8FIXUP = "no"
 
@@ -12,6 +12,7 @@ SRCREV = "a5c60c099296fcfc0c8fa8085c40883971486512"
 
 SRC_URI = "git://dev.omapzoom.org/pub/scm/integration/kernel-ubuntu.git;protocol=git;branch=ti-ubuntu-3.1-1282 \
            file://0001-Makefile.fwinst-fix-install-breakage-for-FW-images-r.patch \
+           file://add_exec_tracepoint.patch \
            file://defconfig \
            "