diff options
| author | Wang Nan <wangnan0@huawei.com> | 2016-05-20 18:38:24 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-20 19:56:58 +0200 |
| commit | d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d (patch) | |
| tree | 665c128afe013e67fc919f07e907445190bce2c2 | |
| parent | perf evsel: Add overwrite attribute and check write_backward (diff) | |
| download | linux-d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d.tar.xz linux-d4c6fb36ac2c82f8f0c05b04cf102dcdc2d5a14d.zip | |
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@huawei.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1463762315-155689-3-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/evlist.c | 6 | ||||
| -rw-r--r-- | tools/perf/util/evlist.h | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index c4bfe11479a0..1a370db02a8c 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 85d1b59802e8..0d165b1d8f77 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; |