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| author |   Alexey Budankov <alexey.budankov@linux.intel.com> | 2018-11-06 12:04:58 +0300 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-12-17 14:55:08 -0300 |
| commit | d3d1af6f011a553a00d2bda90b2700c0d56bd8f7 (patch) | |
| tree | 8f3deb8dcd8b095b3e876fee7d5825c851b10c1c /tools/perf/util/mmap.h | |
| parent | perf mmap: Map data buffer for preserving collected data (diff) | |
| download | linux-dev-d3d1af6f011a553a00d2bda90b2700c0d56bd8f7.tar.xz linux-dev-d3d1af6f011a553a00d2bda90b2700c0d56bd8f7.zip | |
perf record: Enable asynchronous trace writing
The trace file offset is read once before mmaps iterating loop and
written back after all performance data is enqueued for aio writing.
The trace file offset is incremented linearly after every successful aio
write operation.
record__aio_sync() blocks till completion of the started AIO operation
and then proceeds.
record__aio_mmap_read_sync() implements a barrier for all incomplete
aio write requests.
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/ce2d45e9-d236-871c-7c8f-1bed2d37e8ac@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/mmap.h')
| -rw-r--r-- | tools/perf/util/mmap.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h index 3f10ad030c5e..b99213ba11b5 100644 --- a/tools/perf/util/mmap.h +++ b/tools/perf/util/mmap.h @@ -12,6 +12,7 @@ #include "auxtrace.h" #include "event.h" +struct aiocb; /** * struct perf_mmap - perf's ring buffer mmap details * @@ -33,6 +34,7 @@ struct perf_mmap { struct { void *data; struct aiocb cblock; + int nr_cblocks; } aio; #endif }; @@ -94,6 +96,18 @@ union perf_event *perf_mmap__read_event(struct perf_mmap *map); int perf_mmap__push(struct perf_mmap *md, void *to, int push(struct perf_mmap *map, void *to, void *buf, size_t size)); +#ifdef HAVE_AIO_SUPPORT +int perf_mmap__aio_push(struct perf_mmap *md, void *to, + int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off), + off_t *off); +#else +static inline int perf_mmap__aio_push(struct perf_mmap *md __maybe_unused, void *to __maybe_unused, + int push(void *to, struct aiocb *cblock, void *buf, size_t size, off_t off) __maybe_unused, + off_t *off __maybe_unused) +{ + return 0; +} +#endif size_t perf_mmap__mmap_len(struct perf_mmap *map); |