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authorAndi Kleen <ak@linux.intel.com>2016-03-28 10:45:38 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-03-30 11:14:09 -0300
commitd1706b39f0af6901ab2a5e2ebb210b53c1a5bdc7 (patch)
tree4bee0f637581706387688651a57fb867c7f6e559 /tools/perf/util/auxtrace.h
parentf7380c12ec6cfd69f274ba6181cd01c764f877bb (diff)
downloadlinux-d1706b39f0af6901ab2a5e2ebb210b53c1a5bdc7.tar.bz2
perf tools: Add support for skipping itrace instructions
When using 'perf script' to look at PT traces it is often useful to ignore the initialization code at the beginning. On larger traces which may have many millions of instructions in initialization code doing that in a pipeline can be very slow, with perf script spending a lot of CPU time calling printf and writing data. This patch adds an extension to the --itrace argument that skips 'n' events (instructions, branches or transactions) at the beginning. This is much more efficient. v2: Add support for BTS (Adrian Hunter) Document in itrace.txt Fix branch check Check transactions and instructions too Committer note: To test intel_pt one needs to make sure VT-x isn't active, i.e. stopping KVM guests on the test machine, as described by Andi Kleen at http://lkml.kernel.org/r/20160301234953.GD23621@tassilo.jf.intel.com Signed-off-by: Andi Kleen <ak@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1459187142-20035-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/auxtrace.h')
-rw-r--r--tools/perf/util/auxtrace.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 57ff31ecb8e4..767989e0e312 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -68,6 +68,7 @@ enum itrace_period_type {
* @last_branch_sz: branch context size
* @period: 'instructions' events period
* @period_type: 'instructions' events period type
+ * @initial_skip: skip N events at the beginning.
*/
struct itrace_synth_opts {
bool set;
@@ -86,6 +87,7 @@ struct itrace_synth_opts {
unsigned int last_branch_sz;
unsigned long long period;
enum itrace_period_type period_type;
+ unsigned long initial_skip;
};
/**