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Date: Fri, 2 Oct 2015 15:45:25 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: 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>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [RFC/PATCH 03/38] perf tools: Move auxtrace_mmap field to struct
perf_evlist
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?
- 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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