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perf intel-pt: Use itrace debug log flags to suppress some messages

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The "d" option may be followed by flags which affect what debug messages
will or will not be logged. Each flag must be preceded by either '+' or
'-'. The flags support by Intel PT are:

		-a	Suppress logging of perf events

Suppressing perf events is useful for decreasing the size of the log.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200710151104.15137-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2020-07-10 18:11:00 +03:00
committed by Arnaldo Carvalho de Melo
parent 935aac2d2d
commit 8b83fccdd2
2 changed files with 14 additions and 8 deletions
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5
tools/perf/Documentation/perf-intel-pt.txt
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@@ -882,7 +882,10 @@ For example, for errors but not overflow or data lost errors:
The "d" option will cause the creation of a file "intel_pt.log" containing all
decoded packets and instructions. Note that this option slows down the decoder
and that the resulting file may be very large.
and that the resulting file may be very large. The "d" option may be followed
by flags which affect what debug messages will or will not be logged. Each flag
must be preceded by either '+' or '-'. The flags support by Intel PT are:
-a Suppress logging of perf events
In addition, the period of the "instructions" event can be specified. e.g.