diff options
author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-07-01 15:58:24 -0400 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-14 22:59:07 -0700 |
commit | 2fd821ee4dd784a940d6840ebc85ecc8d7b80744 (patch) | |
tree | 17b3a3d247b7414252ce69c9781a0b254e3977aa /scripts | |
parent | e25d45868ca209a7d13772ed313a99ea0f9194d6 (diff) |
tracing: Use flag buffer_disabled for irqsoff tracer
commit 10246fa35d4ffdfe472185d4cbf9c2dfd9a9f023 upstream.
If the ring buffer is disabled and the irqsoff tracer records a trace it
will clear out its buffer and lose the data it had previously recorded.
Currently there's a callback when writing to the tracing_of file, but if
tracing is disabled via the function tracer trigger, it will not inform
the irqsoff tracer to stop recording.
By using the "mirror" flag (buffer_disabled) in the trace_array, that keeps
track of the status of the trace_array's buffer, it gives the irqsoff
tracer a fast way to know if it should record a new trace or not.
The flag may be a little behind the real state of the buffer, but it
should not affect the trace too much. It's more important for the irqsoff
tracer to be fast.
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions