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Message-ID: <tip-d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d@git.kernel.org> Date: Mon, 23 May 2016 22:46:24 -0700 From: tip-bot for Wang Nan <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: tglx@...utronix.de, lizefan@...wei.com, hekuang@...wei.com, wangnan0@...wei.com, mingo@...nel.org, namhyung@...nel.org, mhiramat@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com, acme@...hat.com Subject: [tip:perf/urgent] perf evsel: Record fd into perf_mmap Commit-ID: d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d Gitweb: http://git.kernel.org/tip/d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d Author: Wang Nan <wangnan0@...wei.com> AuthorDate: Fri, 20 May 2016 16:38:24 +0000 Committer: Arnaldo Carvalho de Melo <acme@...hat.com> CommitDate: Fri, 20 May 2016 14:56:58 -0300 perf evsel: Record fd into perf_mmap Add a fd field into struct perf_mmap so that perf can track the mmap fd. This feature will be used for toggling overwrite ring buffers. Signed-off-by: Wang Nan <wangnan0@...wei.com> Cc: He Kuang <hekuang@...wei.com> Cc: Jiri Olsa <jolsa@...nel.org> Cc: Masami Hiramatsu <mhiramat@...nel.org> Cc: Namhyung Kim <namhyung@...nel.org> Cc: Zefan Li <lizefan@...wei.com> Cc: pi3orama@....com Link: http://lkml.kernel.org/r/1463762315-155689-3-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang <hekuang@...wei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> --- tools/perf/util/evlist.c | 6 ++++++ tools/perf/util/evlist.h | 1 + 2 files changed, 7 insertions(+) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index c4bfe11..1a370db 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -881,6 +881,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx) if (evlist->mmap[idx].base != NULL) { munmap(evlist->mmap[idx].base, evlist->mmap_len); evlist->mmap[idx].base = NULL; + evlist->mmap[idx].fd = -1; atomic_set(&evlist->mmap[idx].refcnt, 0); } auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap); @@ -901,10 +902,14 @@ void perf_evlist__munmap(struct perf_evlist *evlist) static int perf_evlist__alloc_mmap(struct perf_evlist *evlist) { + int i; + evlist->nr_mmaps = cpu_map__nr(evlist->cpus); if (cpu_map__empty(evlist->cpus)) evlist->nr_mmaps = thread_map__nr(evlist->threads); evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap)); + for (i = 0; i < evlist->nr_mmaps; i++) + evlist->mmap[i].fd = -1; return evlist->mmap != NULL ? 0 : -ENOMEM; } @@ -941,6 +946,7 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx, evlist->mmap[idx].base = NULL; return -1; } + evlist->mmap[idx].fd = fd; if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap, &mp->auxtrace_mp, evlist->mmap[idx].base, fd)) diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 85d1b598..0d165b1 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -28,6 +28,7 @@ struct record_opts; struct perf_mmap { void *base; int mask; + int fd; atomic_t refcnt; u64 prev; struct auxtrace_mmap auxtrace_mmap;
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