diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-14 11:34:33 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-15 19:38:06 +0300 |
| commit | 32a951b4fd6bbe60ef5d65930b1712321e241b27 (patch) | |
| tree | 6900abcdecfb044b93de799a1f7fcc01e9893ad4 /tools/perf/util/evlist.c | |
| parent | db49120a32b347fb93aea3319305932657dd118c (diff) | |
| download | linux-32a951b4fd6bbe60ef5d65930b1712321e241b27.tar.xz | |
perf evlist: Drop redundant evsel->overwrite indicator
evsel->overwrite indicator means an event should be put into
overwritable ring buffer. In current implementation, it equals to
evsel->attr.write_backward. To reduce compliexity, remove
evsel->overwrite, use evsel->attr.write_backward instead.
In addition, in __perf_evsel__open(), if kernel doesn't support
write_backward and user explicitly set it in evsel, don't fallback
like other missing feature, since it is meaningless to fall back to
a forward ring buffer in this case: we are unable to stably read
from an forward overwritable ring buffer.
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: Nilay Vaish <nilayvaish@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.c')
| -rw-r--r-- | tools/perf/util/evlist.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 862e69c2690d..6803f5ccd15e 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1003,7 +1003,7 @@ static bool perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused, struct perf_evsel *evsel) { - if (evsel->overwrite) + if (evsel->attr.write_backward) return false; return true; } @@ -1018,7 +1018,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx, evlist__for_each_entry(evlist, evsel) { int fd; - if (evsel->overwrite != (evlist->overwrite && evlist->backward)) + if (!!evsel->attr.write_backward != (evlist->overwrite && evlist->backward)) continue; if (evsel->system_wide && thread) |