xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf tools: Add dso__data_get/put_fd()

Browse Source 
Using dso__data_fd() in multi-thread environment is not safe since
returned fd can be closed and/or reused anytime.

So convert it to the dso__data_get/put_fd() pair to protect the access
with lock.

The original dso__data_fd() is deprecated and kept only for testing.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1432137821-10853-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2015-05-21 01:03:41 +09:00
committed by Arnaldo Carvalho de Melo
parent e840238d7c
commit 4bb11d012a
4 changed files with 50 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
tools/perf/util/dso.h
View File

@@ -240,7 +240,8 @@ int __kmod_path__parse(struct kmod_path *m, const char *path,
/*
* The dso__data_* external interface provides following functions:
* dso__data_fd
* dso__data_get_fd
* dso__data_put_fd
* dso__data_close
* dso__data_size
* dso__data_read_offset
@@ -257,8 +258,11 @@ int __kmod_path__parse(struct kmod_path *m, const char *path,
* The current usage of the dso__data_* interface is as follows:
*
* Get DSO's fd:
* int fd = dso__data_fd(dso, machine);
* USE 'fd' SOMEHOW
* int fd = dso__data_get_fd(dso, machine);
* if (fd >= 0) {
* USE 'fd' SOMEHOW
* dso__data_put_fd(dso);
* }
*
* Read DSO's data:
* n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE);
@@ -277,7 +281,8 @@ int __kmod_path__parse(struct kmod_path *m, const char *path,
*
* TODO
*/
int dso__data_fd(struct dso *dso, struct machine *machine);
int dso__data_get_fd(struct dso *dso, struct machine *machine);
void dso__data_put_fd(struct dso *dso __maybe_unused);
void dso__data_close(struct dso *dso);
off_t dso__data_size(struct dso *dso, struct machine *machine);