mirror of
https://git.yoctoproject.org/meta-ti
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Paul Woegerer
110 lines
3.4 KiB
Diff
110 lines
3.4 KiB
Diff
From 4ff16c25e2cc48cbe6956e356c38a25ac063a64d Mon Sep 17 00:00:00 2001
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From: David Smith <dsmith@redhat.com>
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Date: Tue, 7 Feb 2012 10:11:05 -0600
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Subject: [PATCH] tracepoint, vfs, sched: Add exec() tracepoint
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Added a minimal exec tracepoint. Exec is an important major event
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in the life of a task, like fork(), clone() or exit(), all of
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which we already trace.
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[ We also do scheduling re-balancing during exec() - so it's useful
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from a scheduler instrumentation POV as well. ]
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If you want to watch a task start up, when it gets exec'ed is a good place
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to start. With the addition of this tracepoint, exec's can be monitored
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and better picture of general system activity can be obtained. This
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tracepoint will also enable better process life tracking, allowing you to
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answer questions like "what process keeps starting up binary X?".
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This tracepoint can also be useful in ftrace filtering and trigger
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conditions: i.e. starting or stopping filtering when exec is called.
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Signed-off-by: David Smith <dsmith@redhat.com>
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Cc: Steven Rostedt <rostedt@goodmis.org>
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Cc: Christoph Hellwig <hch@infradead.org>
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Cc: Al Viro <viro@zeniv.linux.org.uk>
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Cc: Andrew Morton <akpm@linux-foundation.org>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Link: http://lkml.kernel.org/r/4F314D19.7030504@redhat.com
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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---
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fs/exec.c | 9 ++++++---
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include/trace/events/sched.h | 27 +++++++++++++++++++++++++++
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2 files changed, 33 insertions(+), 3 deletions(-)
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diff --git a/fs/exec.c b/fs/exec.c
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index aeb135c..d0d2080 100644
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--- a/fs/exec.c
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+++ b/fs/exec.c
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@@ -63,6 +63,8 @@
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#include <trace/events/task.h>
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#include "internal.h"
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+#include <trace/events/sched.h>
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+
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int core_uses_pid;
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char core_pattern[CORENAME_MAX_SIZE] = "core";
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unsigned int core_pipe_limit;
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@@ -1401,9 +1403,10 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
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*/
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bprm->recursion_depth = depth;
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if (retval >= 0) {
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- if (depth == 0)
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- ptrace_event(PTRACE_EVENT_EXEC,
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- old_pid);
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+ if (depth == 0) {
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+ trace_sched_process_exec(current, old_pid, bprm);
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+ ptrace_event(PTRACE_EVENT_EXEC, old_pid);
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+ }
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put_binfmt(fmt);
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allow_write_access(bprm->file);
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if (bprm->file)
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diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
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index 6ba596b..e61ddfe 100644
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--- a/include/trace/events/sched.h
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+++ b/include/trace/events/sched.h
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@@ -6,6 +6,7 @@
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#include <linux/sched.h>
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#include <linux/tracepoint.h>
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+#include <linux/binfmts.h>
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/*
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* Tracepoint for calling kthread_stop, performed to end a kthread:
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@@ -276,6 +277,32 @@ TRACE_EVENT(sched_process_fork,
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);
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/*
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+ * Tracepoint for exec:
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+ */
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+TRACE_EVENT(sched_process_exec,
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+
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+ TP_PROTO(struct task_struct *p, pid_t old_pid,
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+ struct linux_binprm *bprm),
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+
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+ TP_ARGS(p, old_pid, bprm),
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+
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+ TP_STRUCT__entry(
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+ __string( filename, bprm->filename )
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+ __field( pid_t, pid )
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+ __field( pid_t, old_pid )
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+ ),
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+
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+ TP_fast_assign(
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+ __assign_str(filename, bprm->filename);
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+ __entry->pid = p->pid;
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+ __entry->old_pid = p->pid;
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+ ),
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+
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+ TP_printk("filename=%s pid=%d old_pid=%d", __get_str(filename),
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+ __entry->pid, __entry->old_pid)
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+);
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+
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+/*
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* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
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* adding sched_stat support to SCHED_FIFO/RR would be welcome.
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*/
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--
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1.7.6.5
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