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>
This commit is contained in:
Andi Kleen 2016-03-28 10:45:38 -07:00 committed by Arnaldo Carvalho de Melo
parent f7380c12ec
commit d1706b39f0
6 changed files with 49 additions and 2 deletions

View File

@ -672,6 +672,7 @@ The letters are:
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)
s skip initial number of events
"Instructions" events look like they were recorded by "perf record -e
instructions".
@ -730,6 +731,12 @@ from one sample to the next.
To disable trace decoding entirely, use the option --no-itrace.
It is also possible to skip events generated (instructions, branches, transactions)
at the beginning. This is useful to ignore initialization code.
--itrace=i0nss1000000
skips the first million instructions.
dump option
-----------

View File

@ -7,6 +7,7 @@
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)
s skip initial number of events
The default is all events i.e. the same as --itrace=ibxe
@ -24,3 +25,10 @@
Also the number of last branch entries (default 64, max. 1024) for
instructions or transactions events can be specified.
It is also possible to skip events generated (instructions, branches, transactions)
at the beginning. This is useful to ignore initialization code.
--itrace=i0nss1000000
skips the first million instructions.

View File

@ -940,6 +940,7 @@ void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
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;
synth_opts->initial_skip = 0;
}
/*
@ -1064,6 +1065,12 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str,
synth_opts->last_branch_sz = val;
}
break;
case 's':
synth_opts->initial_skip = strtoul(p, &endptr, 10);
if (p == endptr)
goto out_err;
p = endptr;
break;
case ' ':
case ',':
break;

View File

@ -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;
};
/**

View File

@ -66,6 +66,7 @@ struct intel_bts {
u64 branches_id;
size_t branches_event_size;
bool synth_needs_swap;
unsigned long num_events;
};
struct intel_bts_queue {
@ -275,6 +276,10 @@ static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
union perf_event event;
struct perf_sample sample = { .ip = 0, };
if (bts->synth_opts.initial_skip &&
bts->num_events++ <= bts->synth_opts.initial_skip)
return 0;
event.sample.header.type = PERF_RECORD_SAMPLE;
event.sample.header.misc = PERF_RECORD_MISC_USER;
event.sample.header.size = sizeof(struct perf_event_header);

View File

@ -100,6 +100,8 @@ struct intel_pt {
u64 cyc_bit;
u64 noretcomp_bit;
unsigned max_non_turbo_ratio;
unsigned long num_events;
};
enum switch_state {
@ -972,6 +974,10 @@ static int intel_pt_synth_branch_sample(struct intel_pt_queue *ptq)
if (pt->branches_filter && !(pt->branches_filter & ptq->flags))
return 0;
if (pt->synth_opts.initial_skip &&
pt->num_events++ < pt->synth_opts.initial_skip)
return 0;
event->sample.header.type = PERF_RECORD_SAMPLE;
event->sample.header.misc = PERF_RECORD_MISC_USER;
event->sample.header.size = sizeof(struct perf_event_header);
@ -1029,6 +1035,10 @@ static int intel_pt_synth_instruction_sample(struct intel_pt_queue *ptq)
union perf_event *event = ptq->event_buf;
struct perf_sample sample = { .ip = 0, };
if (pt->synth_opts.initial_skip &&
pt->num_events++ < pt->synth_opts.initial_skip)
return 0;
event->sample.header.type = PERF_RECORD_SAMPLE;
event->sample.header.misc = PERF_RECORD_MISC_USER;
event->sample.header.size = sizeof(struct perf_event_header);
@ -1087,6 +1097,10 @@ static int intel_pt_synth_transaction_sample(struct intel_pt_queue *ptq)
union perf_event *event = ptq->event_buf;
struct perf_sample sample = { .ip = 0, };
if (pt->synth_opts.initial_skip &&
pt->num_events++ < pt->synth_opts.initial_skip)
return 0;
event->sample.header.type = PERF_RECORD_SAMPLE;
event->sample.header.misc = PERF_RECORD_MISC_USER;
event->sample.header.size = sizeof(struct perf_event_header);
@ -1199,14 +1213,18 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
ptq->have_sample = false;
if (pt->sample_instructions &&
(state->type & INTEL_PT_INSTRUCTION)) {
(state->type & INTEL_PT_INSTRUCTION) &&
(!pt->synth_opts.initial_skip ||
pt->num_events++ >= pt->synth_opts.initial_skip)) {
err = intel_pt_synth_instruction_sample(ptq);
if (err)
return err;
}
if (pt->sample_transactions &&
(state->type & INTEL_PT_TRANSACTION)) {
(state->type & INTEL_PT_TRANSACTION) &&
(!pt->synth_opts.initial_skip ||
pt->num_events++ >= pt->synth_opts.initial_skip)) {
err = intel_pt_synth_transaction_sample(ptq);
if (err)
return err;