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Date: Wed, 23 Jan 2013 12:54:44 +0100
From: Stephane Eranian <eranian@...gle.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: "mingo@...e.hu" <mingo@...e.hu>,
LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrew Morton <akpm@...ux-foundation.org>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 16/29] perf, tools: Add support for weight v7
On Wed, Jan 23, 2013 at 12:38 PM, Stephane Eranian <eranian@...gle.com> wrote:
> On Thu, Jan 17, 2013 at 9:36 PM, Andi Kleen <andi@...stfloor.org> wrote:
>> From: Andi Kleen <ak@...ux.intel.com>
>>
>> perf record has a new option -W that enables weightened sampling.
>>
>> Add sorting support in top/report for the average weight per sample and the
>> total weight sum. This allows to both compare relative cost per event
>> and the total cost over the measurement period.
>>
>> Add the necessary glue to perf report, record and the library.
>>
>> v2: Merge with new hist refactoring.
>> v3: Fix manpage. Remove value check.
>> Rename global_weight to weight and weight to local_weight.
>> v4: Readd sort keys to manpage
>> v5: Move weight to end
>> v6: Move weight to template
>> v7: Rename weight key.
>> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
>> ---
>> tools/perf/Documentation/perf-record.txt | 6 +++
>> tools/perf/Documentation/perf-report.txt | 2 +-
>> tools/perf/Documentation/perf-top.txt | 2 +-
>> tools/perf/builtin-annotate.c | 2 +-
>> tools/perf/builtin-diff.c | 7 ++--
>> tools/perf/builtin-record.c | 2 +
>> tools/perf/builtin-report.c | 7 ++--
>> tools/perf/builtin-top.c | 5 ++-
>> tools/perf/perf.h | 1 +
>> tools/perf/util/event.h | 1 +
>> tools/perf/util/evsel.c | 10 ++++++
>> tools/perf/util/hist.c | 23 +++++++++----
>> tools/perf/util/hist.h | 8 +++-
>> tools/perf/util/session.c | 3 ++
>> tools/perf/util/sort.c | 51 +++++++++++++++++++++++++++++-
>> tools/perf/util/sort.h | 3 ++
>> 16 files changed, 112 insertions(+), 21 deletions(-)
>>
>> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
>> index f7d74b2..6f3405e 100644
>> --- a/tools/perf/Documentation/perf-record.txt
>> +++ b/tools/perf/Documentation/perf-record.txt
>> @@ -185,6 +185,12 @@ is enabled for all the sampling events. The sampled branch type is the same for
>> The various filters must be specified as a comma separated list: --branch-filter any_ret,u,k
>> Note that this feature may not be available on all processors.
>>
>> +-W::
>> +--weight::
>> +Enable weightened sampling. An additional weight is recorded per sample and can be
>> +displayed with the weight and local_weight sort keys. This currently works for TSX
>> +abort events and some memory events in precise mode on modern Intel CPUs.
>> +
>> SEE ALSO
>> --------
>> linkperf:perf-stat[1], linkperf:perf-list[1]
>> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
>> index cb4216d..5dabd4d 100644
>> --- a/tools/perf/Documentation/perf-report.txt
>> +++ b/tools/perf/Documentation/perf-report.txt
>> @@ -59,7 +59,7 @@ OPTIONS
>> --sort=::
>> Sort by key(s): pid, comm, dso, symbol, parent, srcline,
>> dso_from, dso_to, symbol_to, symbol_from, mispredict,
>> - abort, intx
>> + abort, intx, local_weight, weight
>>
>> -p::
>> --parent=<regex>::
>> diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
>> index 1398b73..3533e0a 100644
>> --- a/tools/perf/Documentation/perf-top.txt
>> +++ b/tools/perf/Documentation/perf-top.txt
>> @@ -114,7 +114,7 @@ Default is to monitor all CPUS.
>> --sort::
>> Sort by key(s): pid, comm, dso, symbol, parent, srcline,
>> dso_from, dso_to, symbol_to, symbol_from, mispredict,
>> - abort, intx
>> + abort, intx, local_weight, weight
>>
>> -n::
>> --show-nr-samples::
>> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
>> index dc870cf..1bacb7d 100644
>> --- a/tools/perf/builtin-annotate.c
>> +++ b/tools/perf/builtin-annotate.c
>> @@ -62,7 +62,7 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
>> return 0;
>> }
>>
>> - he = __hists__add_entry(&evsel->hists, al, NULL, 1);
>> + he = __hists__add_entry(&evsel->hists, al, NULL, 1, 1);
>> if (he == NULL)
>> return -ENOMEM;
>>
>> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
>> index 93b852f..03a322f 100644
>> --- a/tools/perf/builtin-diff.c
>> +++ b/tools/perf/builtin-diff.c
>> @@ -248,9 +248,10 @@ int perf_diff__formula(char *buf, size_t size, struct hist_entry *he)
>> }
>>
>> static int hists__add_entry(struct hists *self,
>> - struct addr_location *al, u64 period)
>> + struct addr_location *al, u64 period,
>> + u64 weight)
>> {
>> - if (__hists__add_entry(self, al, NULL, period) != NULL)
>> + if (__hists__add_entry(self, al, NULL, period, weight) != NULL)
>> return 0;
>> return -ENOMEM;
>> }
>> @@ -272,7 +273,7 @@ static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
>> if (al.filtered)
>> return 0;
>>
>> - if (hists__add_entry(&evsel->hists, &al, sample->period)) {
>> + if (hists__add_entry(&evsel->hists, &al, sample->period, sample->weight)) {
>> pr_warning("problem incrementing symbol period, skipping event\n");
>> return -1;
>> }
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index e7da893..4e568aa 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -1062,6 +1062,8 @@ const struct option record_options[] = {
>> OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
>> "branch filter mask", "branch stack filter modes",
>> parse_branch_stack),
>> + OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
>> + "sample by weight (on special events only)"),
>> OPT_END()
>> };
>>
>> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
>> index 072c388..5dc0edd 100644
>> --- a/tools/perf/builtin-report.c
>> +++ b/tools/perf/builtin-report.c
>> @@ -88,7 +88,7 @@ static int perf_report__add_branch_hist_entry(struct perf_tool *tool,
>> * and not events sampled. Thus we use a pseudo period of 1.
>> */
>> he = __hists__add_branch_entry(&evsel->hists, al, parent,
>> - &bi[i], 1);
>> + &bi[i], 1, 1);
>> if (he) {
>> struct annotation *notes;
>> err = -ENOMEM;
>> @@ -146,7 +146,8 @@ static int perf_evsel__add_hist_entry(struct perf_evsel *evsel,
>> return err;
>> }
>>
>> - he = __hists__add_entry(&evsel->hists, al, parent, sample->period);
>> + he = __hists__add_entry(&evsel->hists, al, parent, sample->period,
>> + sample->weight);
>> if (he == NULL)
>> return -ENOMEM;
>>
>> @@ -597,7 +598,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
>> OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
>> "sort by key(s): pid, comm, dso, symbol, parent, dso_to,"
>> " dso_from, symbol_to, symbol_from, mispredict, srcline,"
>> - " abort, intx"),
>> + " abort, intx, weight, local_weight"),
>> OPT_BOOLEAN(0, "showcpuutilization", &symbol_conf.show_cpu_utilization,
>> "Show sample percentage for different cpu modes"),
>> OPT_STRING('p', "parent", &parent_pattern, "regex",
>> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
>> index 6cfb678..9f87db7 100644
>> --- a/tools/perf/builtin-top.c
>> +++ b/tools/perf/builtin-top.c
>> @@ -271,7 +271,8 @@ static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
>> {
>> struct hist_entry *he;
>>
>> - he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
>> + he = __hists__add_entry(&evsel->hists, al, NULL, sample->period,
>> + sample->weight);
>> if (he == NULL)
>> return NULL;
>>
>> @@ -1232,7 +1233,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
>> OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
>> "sort by key(s): pid, comm, dso, symbol, parent, dso_to,"
>> " dso_from, symbol_to, symbol_from, mispredict, srcline,"
>> - " abort, intx"),
>> + " abort, intx, weight, local_weight"),
>> OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
>> "Show a column with the number of samples"),
>> OPT_CALLBACK_DEFAULT('G', "call-graph", &top, "output_type,min_percent, call_order",
>> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
>> index c6d315b..7058155 100644
>> --- a/tools/perf/perf.h
>> +++ b/tools/perf/perf.h
>> @@ -238,6 +238,7 @@ struct perf_record_opts {
>> bool pipe_output;
>> bool raw_samples;
>> bool sample_address;
>> + bool sample_weight;
>> bool sample_time;
>> bool sample_id_all_missing;
>> bool exclude_guest_missing;
>> diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
>> index 0d573ff..a97fbbe 100644
>> --- a/tools/perf/util/event.h
>> +++ b/tools/perf/util/event.h
>> @@ -88,6 +88,7 @@ struct perf_sample {
>> u64 id;
>> u64 stream_id;
>> u64 period;
>> + u64 weight;
>> u32 cpu;
>> u32 raw_size;
>> void *raw_data;
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index 1b16dd1..805d33e 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -510,6 +510,9 @@ void perf_evsel__config(struct perf_evsel *evsel,
>> attr->branch_sample_type = opts->branch_stack;
>> }
>>
>> + if (opts->sample_weight)
>> + attr->sample_type |= PERF_SAMPLE_WEIGHT;
>> +
>> attr->mmap = track;
>> attr->comm = track;
>>
>> @@ -908,6 +911,7 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
>> data->cpu = data->pid = data->tid = -1;
>> data->stream_id = data->id = data->time = -1ULL;
>> data->period = 1;
>> + data->weight = 0;
>>
>> if (event->header.type != PERF_RECORD_SAMPLE) {
>> if (!evsel->attr.sample_id_all)
>> @@ -1058,6 +1062,12 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
>> }
>> }
>>
>> + data->weight = 0;
>> + if (type & PERF_SAMPLE_WEIGHT) {
>> + data->weight = *array;
>> + array++;
>> + }
>> +
>> return 0;
>> }
>>
>> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
>> index cb17e2a..a8d7647 100644
>> --- a/tools/perf/util/hist.c
>> +++ b/tools/perf/util/hist.c
>> @@ -151,9 +151,11 @@ static void hist_entry__add_cpumode_period(struct hist_entry *he,
>> }
>> }
>>
>> -static void he_stat__add_period(struct he_stat *he_stat, u64 period)
>> +static void he_stat__add_period(struct he_stat *he_stat, u64 period,
>> + u64 weight)
>> {
>> he_stat->period += period;
>> + he_stat->weight += weight;
>> he_stat->nr_events += 1;
>> }
>>
>> @@ -165,12 +167,14 @@ static void he_stat__add_stat(struct he_stat *dest, struct he_stat *src)
>> dest->period_guest_sys += src->period_guest_sys;
>> dest->period_guest_us += src->period_guest_us;
>> dest->nr_events += src->nr_events;
>> + dest->weight += src->weight;
>> }
>>
>> static void hist_entry__decay(struct hist_entry *he)
>> {
>> he->stat.period = (he->stat.period * 7) / 8;
>> he->stat.nr_events = (he->stat.nr_events * 7) / 8;
>> + /* XXX need decay for weight too? */
>> }
>>
>> static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
>> @@ -270,7 +274,8 @@ static u8 symbol__parent_filter(const struct symbol *parent)
>> static struct hist_entry *add_hist_entry(struct hists *hists,
>> struct hist_entry *entry,
>> struct addr_location *al,
>> - u64 period)
>> + u64 period,
>> + u64 weight)
>> {
>> struct rb_node **p;
>> struct rb_node *parent = NULL;
>> @@ -288,7 +293,7 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
>> cmp = hist_entry__cmp(entry, he);
>>
>> if (!cmp) {
>> - he_stat__add_period(&he->stat, period);
>> + he_stat__add_period(&he->stat, period, weight);
>>
> With this approach, you will not aggregate samples with similar
> weights for more than 2 samples.
> Example:
> Sample 1 W=250 -> no match, add Sample 1
> Sample 2 W=250 -> match Sample1, Sample1 new weight=500
> Sample 3 W=250 -> no match, add Sample 3
>
> Here you do not aggregate Sample 3 with Sample 1 and 2 , because you've updated
> the weight which you also use in the sort__weight_cmp() routine.
>
> That does not work for me with PEBS-LL. I want aggregation when
> samples are identical.
>
> I don't know why you want to aggregate weights.
Ok, figured this out. I needed to use local_weight and not weight for
the PEBS-LL case.
Works fine now. So I can use your patch unaltered.
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