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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@redhat.com>
hifive-unleashed-5.1
Steven Rostedt 2009-03-16 21:57:17 -04:00
parent 4ca5308523
commit 6adaad14d7
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace.c
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@ -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);