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perf auxtrace: Add option to synthesize branch stacks on samples
Add AUX area tracing option 'l' to synthesize branch stacks on samples just like sample type PERF_SAMPLE_BRANCH_STACK. This is taken into use by Intel PT in a subsequent patch. Based-on-patch-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1443186956-18718-9-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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3 changed files with 28 additions and 0 deletions
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@ -6,6 +6,7 @@
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e synthesize error events
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d create a debug log
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g synthesize a call chain (use with i or x)
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l synthesize last branch entries (use with i or x)
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The default is all events i.e. the same as --itrace=ibxe
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@ -20,3 +21,6 @@
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Also the call chain size (default 16, max. 1024) for instructions or
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transactions events can be specified.
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Also the number of last branch entries (default 64, max. 1024) for
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instructions or transactions events can be specified.
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@ -926,6 +926,8 @@ s64 perf_event__process_auxtrace(struct perf_tool *tool,
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#define PERF_ITRACE_DEFAULT_PERIOD 100000
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#define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 16
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#define PERF_ITRACE_MAX_CALLCHAIN_SZ 1024
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#define PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ 64
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#define PERF_ITRACE_MAX_LAST_BRANCH_SZ 1024
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void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
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{
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@ -936,6 +938,7 @@ void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
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synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
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synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
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synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
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synth_opts->last_branch_sz = PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
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}
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/*
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@ -1043,6 +1046,23 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str,
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synth_opts->callchain_sz = val;
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}
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break;
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case 'l':
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synth_opts->last_branch = true;
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synth_opts->last_branch_sz =
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PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
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while (*p == ' ' || *p == ',')
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p += 1;
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if (isdigit(*p)) {
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unsigned int val;
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val = strtoul(p, &endptr, 10);
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p = endptr;
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if (!val ||
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val > PERF_ITRACE_MAX_LAST_BRANCH_SZ)
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goto out_err;
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synth_opts->last_branch_sz = val;
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}
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break;
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case ' ':
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case ',':
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break;
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@ -63,7 +63,9 @@ enum itrace_period_type {
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* @calls: limit branch samples to calls (can be combined with @returns)
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* @returns: limit branch samples to returns (can be combined with @calls)
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* @callchain: add callchain to 'instructions' events
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* @last_branch: add branch context to 'instruction' events
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* @callchain_sz: maximum callchain size
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* @last_branch_sz: branch context size
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* @period: 'instructions' events period
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* @period_type: 'instructions' events period type
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*/
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@ -79,7 +81,9 @@ struct itrace_synth_opts {
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bool calls;
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bool returns;
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bool callchain;
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bool last_branch;
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unsigned int callchain_sz;
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unsigned int last_branch_sz;
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unsigned long long period;
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enum itrace_period_type period_type;
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};
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