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Thu, 10 Oct 2019 09:06:25 -0700 (PDT) From: Arnaldo Carvalho de Melo X-Google-Original-From: Arnaldo Carvalho de Melo Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id C4B2A4DD66; Thu, 10 Oct 2019 13:06:22 -0300 (-03) Date: Thu, 10 Oct 2019 13:06:22 -0300 To: Jiri Olsa Cc: lkml , Ingo Molnar , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Michael Petlan Subject: Re: [PATCH 27/36] libperf: Add perf_evlist__for_each_mmap function Message-ID: <20191010160622.GC11638@kernel.org> References: <20191007125344.14268-1-jolsa@kernel.org> <20191007125344.14268-28-jolsa@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191007125344.14268-28-jolsa@kernel.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Mon, Oct 07, 2019 at 02:53:35PM +0200, Jiri Olsa escreveu: > Adding perf_evlist__for_each_mmap function and exporting > it in perf/evlist.h header, so user can iterate through > 'struct perf_mmap' objects. > > Adding internal perf_mmap__link function to do the actual > linking. > > Link: http://lkml.kernel.org/n/tip-5h62ytvpxgozhqix2y41cvex@git.kernel.org > Signed-off-by: Jiri Olsa > --- > tools/perf/lib/evlist.c | 26 +++++++++++++++++++++++- > tools/perf/lib/include/internal/evlist.h | 2 ++ > tools/perf/lib/include/internal/mmap.h | 5 +++-- > tools/perf/lib/include/perf/evlist.h | 9 ++++++++ > tools/perf/lib/libperf.map | 1 + > tools/perf/lib/mmap.c | 6 ++++-- > tools/perf/util/evlist.c | 4 +++- > 7 files changed, 47 insertions(+), 6 deletions(-) > > diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c > index 65045614c938..4e85d9bb92bf 100644 > --- a/tools/perf/lib/evlist.c > +++ b/tools/perf/lib/evlist.c > @@ -347,6 +347,8 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo > return NULL; > > for (i = 0; i < evlist->nr_mmaps; i++) { > + struct perf_mmap *prev = i ? &map[i - 1] : NULL; > + > /* > * When the perf_mmap() call is made we grab one refcount, plus > * one extra to let perf_mmap__consume() get the last > @@ -356,7 +358,7 @@ static struct perf_mmap* perf_evlist__alloc_mmap(struct perf_evlist *evlist, boo > * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and > * thus does perf_mmap__get() on it. > */ > - perf_mmap__init(&map[i], overwrite, NULL); > + perf_mmap__init(&map[i], prev, overwrite, NULL); > } > > return map; > @@ -405,6 +407,15 @@ perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp, > return perf_mmap__mmap(map, mp, output, cpu); > } > > +static void perf_evlist__set_mmap0(struct perf_evlist *evlist, struct perf_mmap *map, > + bool overwrite) > +{ > + if (overwrite) > + evlist->mmap_ovw0 = map; > + else > + evlist->mmap0 = map; > +} > + > static int > mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, > int idx, struct perf_mmap_param *mp, int cpu_idx, > @@ -460,6 +471,9 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, > > if (ops->mmap(map, mp, *output, evlist_cpu) < 0) > return -1; > + > + if (!idx) > + perf_evlist__set_mmap0(evlist, map, overwrite); > } else { > if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) > return -1; > @@ -605,3 +619,13 @@ void perf_evlist__munmap(struct perf_evlist *evlist) > zfree(&evlist->mmap); > zfree(&evlist->mmap_ovw); > } > + > +struct perf_mmap* > +perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map, > + bool overwrite) > +{ > + if (map) > + return map->next; > + > + return overwrite ? evlist->mmap_ovw0 : evlist->mmap0; > +} > diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h > index be0b25a70730..513a85cb7bfe 100644 > --- a/tools/perf/lib/include/internal/evlist.h > +++ b/tools/perf/lib/include/internal/evlist.h > @@ -25,6 +25,8 @@ struct perf_evlist { > struct hlist_head heads[PERF_EVLIST__HLIST_SIZE]; > struct perf_mmap *mmap; > struct perf_mmap *mmap_ovw; > + struct perf_mmap *mmap0; > + struct perf_mmap *mmap_ovw0; Why do you use this funny name? Using this "0" suffix? Please pick something more informative and add a comment on the struct perf_evlist definiton. I've processed up to the previous patch, pushed to acme/tmp.perf/core. - Arnaldo > }; > > typedef void > diff --git a/tools/perf/lib/include/internal/mmap.h b/tools/perf/lib/include/internal/mmap.h > index b328332b6ccf..f5b4f902b453 100644 > --- a/tools/perf/lib/include/internal/mmap.h > +++ b/tools/perf/lib/include/internal/mmap.h > @@ -33,6 +33,7 @@ struct perf_mmap { > u64 flush; > libperf_unmap_cb_t unmap_cb; > char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8); > + struct perf_mmap *next; > }; > > struct perf_mmap_param { > @@ -42,8 +43,8 @@ struct perf_mmap_param { > > size_t perf_mmap__mmap_len(struct perf_mmap *map); > > -void perf_mmap__init(struct perf_mmap *map, bool overwrite, > - libperf_unmap_cb_t unmap_cb); > +void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, > + bool overwrite, libperf_unmap_cb_t unmap_cb); > int perf_mmap__mmap(struct perf_mmap *map, struct perf_mmap_param *mp, > int fd, int cpu); > void perf_mmap__munmap(struct perf_mmap *map); > diff --git a/tools/perf/lib/include/perf/evlist.h b/tools/perf/lib/include/perf/evlist.h > index 16f526e74d13..8c4b3c28535e 100644 > --- a/tools/perf/lib/include/perf/evlist.h > +++ b/tools/perf/lib/include/perf/evlist.h > @@ -3,6 +3,7 @@ > #define __LIBPERF_EVLIST_H > > #include > +#include > > struct perf_evlist; > struct perf_evsel; > @@ -38,4 +39,12 @@ LIBPERF_API int perf_evlist__filter_pollfd(struct perf_evlist *evlist, > LIBPERF_API int perf_evlist__mmap(struct perf_evlist *evlist, int pages); > LIBPERF_API void perf_evlist__munmap(struct perf_evlist *evlist); > > +LIBPERF_API struct perf_mmap *perf_evlist__next_mmap(struct perf_evlist *evlist, > + struct perf_mmap *map, > + bool overwrite); > +#define perf_evlist__for_each_mmap(evlist, pos, overwrite) \ > + for ((pos) = perf_evlist__next_mmap((evlist), NULL, overwrite); \ > + (pos) != NULL; \ > + (pos) = perf_evlist__next_mmap((evlist), (pos), overwrite)) > + > #endif /* __LIBPERF_EVLIST_H */ > diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map > index 2184aba36c3f..8be02afc324b 100644 > --- a/tools/perf/lib/libperf.map > +++ b/tools/perf/lib/libperf.map > @@ -43,6 +43,7 @@ LIBPERF_0.0.1 { > perf_evlist__mmap; > perf_evlist__munmap; > perf_evlist__filter_pollfd; > + perf_evlist__next_mmap; > perf_mmap__consume; > perf_mmap__read_init; > perf_mmap__read_done; > diff --git a/tools/perf/lib/mmap.c b/tools/perf/lib/mmap.c > index fe9e1b095fd7..fe7e9ef8a68c 100644 > --- a/tools/perf/lib/mmap.c > +++ b/tools/perf/lib/mmap.c > @@ -12,13 +12,15 @@ > #include > #include "internal.h" > > -void perf_mmap__init(struct perf_mmap *map, bool overwrite, > - libperf_unmap_cb_t unmap_cb) > +void perf_mmap__init(struct perf_mmap *map, struct perf_mmap *prev, > + bool overwrite, libperf_unmap_cb_t unmap_cb) > { > map->fd = -1; > map->overwrite = overwrite; > map->unmap_cb = unmap_cb; > refcount_set(&map->refcnt, 0); > + if (prev) > + prev->next = map; > } > > size_t perf_mmap__mmap_len(struct perf_mmap *map) > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c > index 4910ae711b13..469a5476ef1a 100644 > --- a/tools/perf/util/evlist.c > +++ b/tools/perf/util/evlist.c > @@ -582,6 +582,8 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist, > return NULL; > > for (i = 0; i < evlist->core.nr_mmaps; i++) { > + struct perf_mmap *prev = i ? &map[i - 1].core : NULL; > + > /* > * When the perf_mmap() call is made we grab one refcount, plus > * one extra to let perf_mmap__consume() get the last > @@ -591,7 +593,7 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist, > * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and > * thus does perf_mmap__get() on it. > */ > - perf_mmap__init(&map[i].core, overwrite, perf_mmap__unmap_cb); > + perf_mmap__init(&map[i].core, prev, overwrite, perf_mmap__unmap_cb); > } > > return map; > -- > 2.21.0 -- - Arnaldo