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Date: Mon, 5 Oct 2015 14:29:37 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jiri Olsa <jolsa@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Stephane Eranian <eranian@...gle.com>,
David Ahern <dsahern@...il.com>,
Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC/PATCH 03/38] perf tools: Move auxtrace_mmap field to struct
perf_evlist
On 02/10/15 21:45, Arnaldo Carvalho de Melo wrote:
> Em Fri, Oct 02, 2015 at 02:18:44PM +0900, Namhyung Kim escreveu:
>> Since it's gonna share struct mmap with dummy tracking evsel to track
>> meta events only, let's move auxtrace out of struct perf_mmap.
> Is this moving around _strictly_ needed?
Also, what if you wanted to capture AUX data and tracking together.
In addition, currently Intel PT can have either 1 dummy event for tracking
plus sched_switch
or 2 dummy events to allow for system-wide tracking of context switches.
i.e. there
are multiple tracking events.
>
> - Arnaldo
>
>> Cc: Adrian Hunter <adrian.hunter@...el.com>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>> tools/perf/builtin-record.c | 4 ++--
>> tools/perf/util/evlist.c | 30 +++++++++++++++++++++---------
>> tools/perf/util/evlist.h | 2 +-
>> 3 files changed, 24 insertions(+), 12 deletions(-)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index 5e01c070dbf2..0accac6e0812 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -220,7 +220,7 @@ static int record__auxtrace_read_snapshot_all(struct record *rec)
>>
>> for (i = 0; i < rec->evlist->nr_mmaps; i++) {
>> struct auxtrace_mmap *mm =
>> - &rec->evlist->mmap[i].auxtrace_mmap;
>> + &rec->evlist->auxtrace_mmap[i];
>>
>> if (!mm->base)
>> continue;
>> @@ -405,7 +405,7 @@ static int record__mmap_read_all(struct record *rec)
>> int rc = 0;
>>
>> for (i = 0; i < rec->evlist->nr_mmaps; i++) {
>> - struct auxtrace_mmap *mm = &rec->evlist->mmap[i].auxtrace_mmap;
>> + struct auxtrace_mmap *mm = &rec->evlist->auxtrace_mmap[i];
>>
>> if (rec->evlist->mmap[i].base) {
>> if (record__mmap_read(rec, i) != 0) {
>> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
>> index e46adcd5b408..042dffc67986 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -810,9 +810,12 @@ union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
>> return event;
>> }
>>
>> -static bool perf_mmap__empty(struct perf_mmap *md)
>> +static bool perf_evlist__mmap_empty(struct perf_evlist *evlist, int idx)
>> {
>> - return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;
>> + struct perf_mmap *md = &evlist->mmap[idx];
>> +
>> + return perf_mmap__read_head(md) == md->prev &&
>> + evlist->auxtrace_mmap[idx].base == NULL;
>> }
>>
>> static void perf_evlist__mmap_get(struct perf_evlist *evlist, int idx)
>> @@ -838,7 +841,7 @@ void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
>> perf_mmap__write_tail(md, old);
>> }
>>
>> - if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md))
>> + if (atomic_read(&md->refcnt) == 1 && perf_evlist__mmap_empty(evlist, idx))
>> perf_evlist__mmap_put(evlist, idx);
>> }
>>
>> @@ -879,7 +882,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
>> evlist->mmap[idx].base = NULL;
>> atomic_set(&evlist->mmap[idx].refcnt, 0);
>> }
>> - auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap);
>> + auxtrace_mmap__munmap(&evlist->auxtrace_mmap[idx]);
>> }
>>
>> void perf_evlist__munmap(struct perf_evlist *evlist)
>> @@ -901,7 +904,15 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
>> if (cpu_map__empty(evlist->cpus))
>> evlist->nr_mmaps = thread_map__nr(evlist->threads);
>> evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
>> - return evlist->mmap != NULL ? 0 : -ENOMEM;
>> + if (evlist->mmap == NULL)
>> + return -ENOMEM;
>> + evlist->auxtrace_mmap = calloc(evlist->nr_mmaps,
>> + sizeof(struct auxtrace_mmap));
>> + if (evlist->auxtrace_mmap == NULL) {
>> + zfree(&evlist->mmap);
>> + return -ENOMEM;
>> + }
>> + return 0;
>> }
>>
>> struct mmap_params {
>> @@ -938,10 +949,6 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
>> return -1;
>> }
>>
>> - if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap,
>> - &mp->auxtrace_mp, evlist->mmap[idx].base, fd))
>> - return -1;
>> -
>> return 0;
>> }
>>
>> @@ -963,6 +970,11 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
>> *output = fd;
>> if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0)
>> return -1;
>> +
>> + if (auxtrace_mmap__mmap(&evlist->auxtrace_mmap[idx],
>> + &mp->auxtrace_mp,
>> + evlist->mmap[idx].base, fd))
>> + return -1;
>> } else {
>> if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
>> return -1;
>> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
>> index 414e383885f5..51574ce8ac69 100644
>> --- a/tools/perf/util/evlist.h
>> +++ b/tools/perf/util/evlist.h
>> @@ -30,7 +30,6 @@ struct perf_mmap {
>> int mask;
>> atomic_t refcnt;
>> u64 prev;
>> - struct auxtrace_mmap auxtrace_mmap;
>> char event_copy[PERF_SAMPLE_MAX_SIZE] __attribute__((aligned(8)));
>> };
>>
>> @@ -53,6 +52,7 @@ struct perf_evlist {
>> } workload;
>> struct fdarray pollfd;
>> struct perf_mmap *mmap;
>> + struct auxtrace_mmap *auxtrace_mmap;
>> struct thread_map *threads;
>> struct cpu_map *cpus;
>> struct perf_evsel *selected;
>> --
>> 2.6.0
--
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