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| author | Wang Nan <wangnan0@huawei.com> | 2016-07-14 08:34:45 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-15 17:27:51 -0300 |
| commit | 626a6b784e91bc61ca9fe0f9dd5bb60cb91ccb6b (patch) | |
| tree | 098aaace6e0697084a0c9e88c6c5b26927e215f3 /tools/perf/tests/backward-ring-buffer.c | |
| parent | f6cdff8329e04b08cbc195194223e9dbadeeaa1e (diff) | |
| download | linux-626a6b784e91bc61ca9fe0f9dd5bb60cb91ccb6b.tar.bz2 | |
perf tools: Enable overwrite settings
This patch allows following config terms and option:
Globally setting events to overwrite;
# perf record --overwrite ...
Set specific events to be overwrite or no-overwrite.
# perf record --event cycles/overwrite/ ...
# perf record --event cycles/no-overwrite/ ...
Add missing config terms and update the config term array size because
the longest string length has changed.
For overwritable events, it automatically selects attr.write_backward
since perf requires it to be backward for reading.
Test result:
# perf record --overwrite -e syscalls:*enter_nanosleep* usleep 1
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.011 MB perf.data (1 samples) ]
# perf evlist -v
syscalls:sys_enter_nanosleep: type: 2, size: 112, config: 0x134, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW, disabled: 1, inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, write_backward: 1
# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-14-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@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 | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c index db9cd3048655..615780cbfe1d 100644 --- a/tools/perf/tests/backward-ring-buffer.c +++ b/tools/perf/tests/backward-ring-buffer.c @@ -108,7 +108,11 @@ int test__backward_ring_buffer(int subtest __maybe_unused) } bzero(&parse_error, sizeof(parse_error)); - err = parse_events(evlist, "syscalls:sys_enter_prctl", &parse_error); + /* + * Set backward bit, ring buffer should be writing from end. Record + * it in aux evlist + */ + err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error); if (err) { pr_debug("Failed to parse tracepoint event, try use root\n"); ret = TEST_SKIP; @@ -117,10 +121,6 @@ int test__backward_ring_buffer(int subtest __maybe_unused) perf_evlist__config(evlist, &opts, NULL); - /* Set backward bit, ring buffer should be writing from end */ - evlist__for_each_entry(evlist, evsel) - evsel->attr.write_backward = 1; - err = perf_evlist__open(evlist); if (err < 0) { pr_debug("perf_evlist__open: %s\n", |