From d3d1af6f011a553a00d2bda90b2700c0d56bd8f7 Mon Sep 17 00:00:00 2001 From: Alexey Budankov Date: Tue, 6 Nov 2018 12:04:58 +0300 Subject: 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 Reviewed-by: Jiri Olsa Acked-by: Namhyung Kim Cc: Alexander Shishkin Cc: Andi Kleen Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/ce2d45e9-d236-871c-7c8f-1bed2d37e8ac@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evlist.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'tools/perf/util/evlist.c') diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 6f010b9f0a81..e90575192209 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1018,7 +1018,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, */ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, unsigned int auxtrace_pages, - bool auxtrace_overwrite) + bool auxtrace_overwrite, int nr_cblocks) { struct perf_evsel *evsel; const struct cpu_map *cpus = evlist->cpus; @@ -1028,7 +1028,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, * Its value is decided by evsel's write_backward. * So &mp should not be passed through const pointer. */ - struct mmap_params mp = { .nr_cblocks = 0 }; + struct mmap_params mp = { .nr_cblocks = nr_cblocks }; if (!evlist->mmap) evlist->mmap = perf_evlist__alloc_mmap(evlist, false); @@ -1060,7 +1060,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages, int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages) { - return perf_evlist__mmap_ex(evlist, pages, 0, false); + return perf_evlist__mmap_ex(evlist, pages, 0, false, 0); } int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target) -- cgit