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| author | Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> | 2015-11-07 01:32:05 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-07 02:50:42 +0100 |
| commit | 83eec5e6dd10f0b1ab83ee660c8be883b3da7ba8 (patch) | |
| tree | dfda7436993043b6aeb0cc1d6990effc3fed344d /fs/nilfs2/sufile.c | |
| parent | nilfs2: add a tracepoint for transaction events (diff) | |
| download | linux-83eec5e6dd10f0b1ab83ee660c8be883b3da7ba8.tar.xz linux-83eec5e6dd10f0b1ab83ee660c8be883b3da7ba8.zip | |
nilfs2: add tracepoints for analyzing sufile manipulation
This patch adds tracepoints which would be useful for analyzing segment
usage from a perspective of high level sufile manipulation (check, alloc,
free). sufile is an important in-place updated metadata file, so
analyzing the behavior would be useful for performance turning.
example of usage (a case of allocation):
$ sudo bin/tpoint nilfs2:nilfs2_segment_usage_allocated
Tracing nilfs2:nilfs2_segment_usage_allocated. Ctrl-C to end.
segctord-17800 [002] ...1 10671.867294: nilfs2_segment_usage_allocated: sufile = ffff880054f908a8 segnum = 2
segctord-17800 [002] ...1 10675.073477: nilfs2_segment_usage_allocated: sufile = ffff880054f908a8 segnum = 3
Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Benixon Dhas <benixon.dhas@wdc.com>
Cc: TK Kato <TK.Kato@wdc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/sufile.c')
| -rw-r--r-- | fs/nilfs2/sufile.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c index 2a869c35c362..7ff8f15207ab 100644 --- a/fs/nilfs2/sufile.c +++ b/fs/nilfs2/sufile.c @@ -30,6 +30,8 @@ #include "mdt.h" #include "sufile.h" +#include <trace/events/nilfs2.h> + /** * struct nilfs_sufile_info - on-memory private data of sufile * @mi: on-memory private data of metadata file @@ -358,6 +360,7 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) break; /* never happens */ } } + trace_nilfs2_segment_usage_check(sufile, segnum, cnt); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &su_bh); if (ret < 0) @@ -388,6 +391,9 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) nilfs_mdt_mark_dirty(sufile); brelse(su_bh); *segnump = segnum; + + trace_nilfs2_segment_usage_allocated(sufile, segnum); + goto out_header; } @@ -490,6 +496,8 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, NILFS_SUI(sufile)->ncleansegs++; nilfs_mdt_mark_dirty(sufile); + + trace_nilfs2_segment_usage_freed(sufile, segnum); } /** |