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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-14 08:34:33 +0000 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-07-15 13:38:06 -0300 |
commit | 32a951b4fd6bbe60ef5d65930b1712321e241b27 (patch) | |
tree | 6900abcdecfb044b93de799a1f7fcc01e9893ad4 /tools | |
parent | db49120a32b347fb93aea3319305932657dd118c (diff) | |
download | linux-32a951b4fd6bbe60ef5d65930b1712321e241b27.tar.gz linux-32a951b4fd6bbe60ef5d65930b1712321e241b27.tar.bz2 linux-32a951b4fd6bbe60ef5d65930b1712321e241b27.zip |
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')
-rw-r--r-- | tools/perf/tests/backward-ring-buffer.c | 1 | ||||
-rw-r--r-- | tools/perf/util/evlist.c | 4 | ||||
-rw-r--r-- | tools/perf/util/evsel.c | 12 | ||||
-rw-r--r-- | tools/perf/util/evsel.h | 1 |
4 files changed, 8 insertions, 10 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"); 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) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index ba0f59fa3d5d..9ac2f92ce88d 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1377,6 +1377,9 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus, int pid = -1, err; enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE; + if (perf_missing_features.write_backward && evsel->attr.write_backward) + return -EINVAL; + if (evsel->system_wide) nthreads = 1; else @@ -1407,11 +1410,6 @@ fallback_missing_features: if (perf_missing_features.lbr_flags) evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS | PERF_SAMPLE_BRANCH_NO_CYCLES); - if (perf_missing_features.write_backward) { - if (evsel->overwrite) - return -EINVAL; - evsel->attr.write_backward = false; - } retry_sample_id: if (perf_missing_features.sample_id_all) evsel->attr.sample_id_all = 0; @@ -1513,7 +1511,7 @@ try_fallback: */ if (!perf_missing_features.write_backward && evsel->attr.write_backward) { perf_missing_features.write_backward = true; - goto fallback_missing_features; + goto out_close; } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) { perf_missing_features.clockid_wrong = true; goto fallback_missing_features; @@ -2422,7 +2420,7 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target, "We found oprofile daemon running, please stop it and try again."); break; case EINVAL: - if (evsel->overwrite && perf_missing_features.write_backward) + if (evsel->attr.write_backward && perf_missing_features.write_backward) return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel."); if (perf_missing_features.clockid) return scnprintf(msg, size, "clockid feature not supported."); diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index d73391e8740e..e60cbfc2cd35 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -114,7 +114,6 @@ struct perf_evsel { bool tracking; bool per_pkg; bool precise_max; - bool overwrite; /* parse modifier helper */ int exclude_GH; int nr_members; |