[PATCH 39/42] perf tools: Convert lseek + read to pread

[Namhyung Kim]

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@xxxxxxxxxx>
---
 tools/perf/util/dso.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index ae92046ae2c8..b6ad22b3c6f2 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -566,10 +566,7 @@ dso_cache__read(struct dso *dso, struct machine *machine,
 		}
 	}
 
-	if (-1 == lseek(dso->data.fd, cache_offset, SEEK_SET))
-		goto err_unlock;
-
-	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)
 		goto err_unlock;
 
-- 
2.2.2

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