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/tests/backward-ring-buffer.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/tests/backward-ring-buffer.c')
| -rw-r--r-- | tools/perf/tests/backward-ring-buffer.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c index f20ea4c0d0cb..5cee3873f2b5 100644 --- a/tools/perf/tests/backward-ring-buffer.c +++ b/tools/perf/tests/backward-ring-buffer.c @@ -101,6 +101,7 @@ int test__backward_ring_buffer(int subtest __maybe_unused) return TEST_FAIL; } + evlist->backward = true; err = perf_evlist__create_maps(evlist, &opts.target); if (err < 0) { pr_debug("Not enough memory to create thread/cpu maps\n"); |