From 601897b54c7ed492a89b262dccd7c6f7faf12b30 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 25 Sep 2015 16:15:39 +0300 Subject: 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 Signed-off-by: Adrian Hunter Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1443186956-18718-9-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/auxtrace.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'tools/perf/util/auxtrace.c') diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index c4993b2e6c50..7f10430af39c 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -926,6 +926,8 @@ s64 perf_event__process_auxtrace(struct perf_tool *tool, #define PERF_ITRACE_DEFAULT_PERIOD 100000 #define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 16 #define PERF_ITRACE_MAX_CALLCHAIN_SZ 1024 +#define PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ 64 +#define PERF_ITRACE_MAX_LAST_BRANCH_SZ 1024 void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts) { @@ -936,6 +938,7 @@ void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts) synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE; synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD; synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ; + synth_opts->last_branch_sz = PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ; } /* @@ -1043,6 +1046,23 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str, synth_opts->callchain_sz = val; } break; + case 'l': + synth_opts->last_branch = true; + synth_opts->last_branch_sz = + PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ; + while (*p == ' ' || *p == ',') + p += 1; + if (isdigit(*p)) { + unsigned int val; + + val = strtoul(p, &endptr, 10); + p = endptr; + if (!val || + val > PERF_ITRACE_MAX_LAST_BRANCH_SZ) + goto out_err; + synth_opts->last_branch_sz = val; + } + break; case ' ': case ',': break; -- cgit v1.2.3-55-g7522