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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>
This commit is contained in:
Adrian Hunter 2015-09-25 16:15:39 +03:00 committed by Arnaldo Carvalho de Melo
parent 35ca01c117
commit 601897b54c
3 changed files with 28 additions and 0 deletions
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4
tools/perf/Documentation/itrace.txt
View File

@ -6,6 +6,7 @@
e synthesize error events
d create a debug log
g synthesize a call chain (use with i or x)
l synthesize last branch entries (use with i or x)
The default is all events i.e. the same as --itrace=ibxe
@ -20,3 +21,6 @@
Also the call chain size (default 16, max. 1024) for instructions or
transactions events can be specified.
Also the number of last branch entries (default 64, max. 1024) for
instructions or transactions events can be specified.

20
tools/perf/util/auxtrace.c
View File

@ -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;

4
tools/perf/util/auxtrace.h
View File

@ -63,7 +63,9 @@ enum itrace_period_type {
* @calls: limit branch samples to calls (can be combined with @returns)
* @returns: limit branch samples to returns (can be combined with @calls)
* @callchain: add callchain to 'instructions' events
* @last_branch: add branch context to 'instruction' events
* @callchain_sz: maximum callchain size
* @last_branch_sz: branch context size
* @period: 'instructions' events period
* @period_type: 'instructions' events period type
*/
@ -79,7 +81,9 @@ struct itrace_synth_opts {
bool calls;
bool returns;
bool callchain;
bool last_branch;
unsigned int callchain_sz;
unsigned int last_branch_sz;
unsigned long long period;
enum itrace_period_type period_type;
};