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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>
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@ -881,6 +881,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
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if (evlist->mmap[idx].base != NULL) {
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munmap(evlist->mmap[idx].base, evlist->mmap_len);
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evlist->mmap[idx].base = NULL;
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evlist->mmap[idx].fd = -1;
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atomic_set(&evlist->mmap[idx].refcnt, 0);
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}
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auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap);
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@ -901,10 +902,14 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
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static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
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{
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int i;
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evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
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if (cpu_map__empty(evlist->cpus))
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evlist->nr_mmaps = thread_map__nr(evlist->threads);
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evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
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for (i = 0; i < evlist->nr_mmaps; i++)
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evlist->mmap[i].fd = -1;
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return evlist->mmap != NULL ? 0 : -ENOMEM;
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}
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@ -941,6 +946,7 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
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evlist->mmap[idx].base = NULL;
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return -1;
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}
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evlist->mmap[idx].fd = fd;
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if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap,
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&mp->auxtrace_mp, evlist->mmap[idx].base, fd))
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@ -28,6 +28,7 @@ struct record_opts;
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struct perf_mmap {
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void *base;
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int mask;
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int fd;
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atomic_t refcnt;
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u64 prev;
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struct auxtrace_mmap auxtrace_mmap;
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