Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 10/10] perf symbols: Convert lseek + read to pread | Date | Thu, 29 Jan 2015 17:23:45 -0300 |
| |
From: Namhyung Kim <namhyung@kernel.org>
When dso_cache__read() is called, it reads data from the given offset using lseek + normal read syscall. It can be combined to a single pread syscall.
Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1422518843-25818-40-git-send-email-namhyung@kernel.org [ Fixed it up when cherry picking it from the multi threaded patchkit ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/dso.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 45be944d450a..c2f7d3b90966 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -532,12 +532,8 @@ dso_cache__read(struct dso *dso, u64 offset, u8 *data, ssize_t size) break; cache_offset = offset & DSO__DATA_CACHE_MASK; - ret = -EINVAL; - if (-1 == lseek(dso->data.fd, cache_offset, SEEK_SET)) - break; - - ret = read(dso->data.fd, cache->data, DSO__DATA_CACHE_SIZE); + ret = pread(dso->data.fd, cache->data, DSO__DATA_CACHE_SIZE, cache_offset); if (ret <= 0) break; -- 1.9.3
| |