Commit-ID: 6adaad14d7d4d3ef31b4e2dc992b18b5da7c4eb3
Gitweb: http://git.kernel.org/tip/6adaad14d7d4d3ef31b4e2dc992b18b5da7c4eb3
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Mon, 16 Mar 2009 21:57:17 -0400
Commit: Steven Rostedt <srostedt@xxxxxxxxxx>
CommitDate: Mon, 16 Mar 2009 23:31:15 -0400
tracing: stop comm recording on tracing off
Impact: fix for losing comms in trace
The command lines of tasks are cached at sched switch to not need
to record them at every trace point. Disabling the tracing on stops
the recording of traces, but does not stop the caching of command lines.
When the tracing is off the cache may overflow and cause the tracing
to show incorrect tasks matching the PIDs.
This patch disables prevents updates to the comm cache when the ring buffer
is off.
Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
---
kernel/trace/trace.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2796bd2..8f89690 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -797,7 +797,7 @@ void trace_find_cmdline(int pid, char comm[])
void tracing_record_cmdline(struct task_struct *tsk)
{
- if (atomic_read(&trace_record_cmdline_disabled))
+ if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
return;
trace_save_cmdline(tsk);
--
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