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perf tools: Use O_LARGEFILE to open perf data file

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Open perf data file with O_LARGEFILE flag since its size is
easily larger that 2G.

For example:

 # rm -rf perf.data
 # ./perf kmem record sleep 300

 [ perf record: Woken up 0 times to write data ]
 [ perf record: Captured and wrote 3142.147 MB perf.data
 (~137282513 samples) ]

 # ll -h perf.data
 -rw------- 1 root root 3.1G .....

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4B68F32A.9040203@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Xiao Guangrong
2010-02-03 11:53:14 +08:00
committed by Ingo Molnar
parent 59f411b62c
commit b8f46c5a34
4 changed files with 23 additions and 13 deletions
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5
tools/perf/util/session.c
View File

@@ -1,3 +1,6 @@
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
#include <linux/kernel.h>
#include <byteswap.h>
@@ -12,7 +15,7 @@ static int perf_session__open(struct perf_session *self, bool force)
{
struct stat input_stat;
self->fd = open(self->filename, O_RDONLY);
self->fd = open(self->filename, O_RDONLY|O_LARGEFILE);
if (self->fd < 0) {
pr_err("failed to open file: %s", self->filename);
if (!strcmp(self->filename, "perf.data"))