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authorHitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>2015-11-07 03:32:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-07 04:50:42 +0300
commit83eec5e6dd10f0b1ab83ee660c8be883b3da7ba8 (patch)
treedfda7436993043b6aeb0cc1d6990effc3fed344d /fs/nilfs2/sufile.c
parent44fda114601fa5edebeacecb265f09d802670bc0 (diff)
downloadlinux-83eec5e6dd10f0b1ab83ee660c8be883b3da7ba8.tar.xz
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.c8
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);
}
/**