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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>
This commit is contained in:
Hitoshi Mitake 2015-11-06 16:32:05 -08:00 committed by Linus Torvalds
parent 44fda11460
commit 83eec5e6dd
2 changed files with 75 additions and 0 deletions
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8
fs/nilfs2/sufile.c
View File

@ -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);
}
/**

67
include/trace/events/nilfs2.h
View File

@ -95,6 +95,73 @@ TRACE_EVENT(nilfs2_transaction_transition,
show_transaction_state(__entry->state))
);
TRACE_EVENT(nilfs2_segment_usage_check,
TP_PROTO(struct inode *sufile,
__u64 segnum,
unsigned long cnt),
TP_ARGS(sufile, segnum, cnt),
TP_STRUCT__entry(
__field(struct inode *, sufile)
__field(__u64, segnum)
__field(unsigned long, cnt)
),
TP_fast_assign(
__entry->sufile = sufile;
__entry->segnum = segnum;
__entry->cnt = cnt;
),
TP_printk("sufile = %p segnum = %llu cnt = %lu",
__entry->sufile,
__entry->segnum,
__entry->cnt)
);
TRACE_EVENT(nilfs2_segment_usage_allocated,
TP_PROTO(struct inode *sufile,
__u64 segnum),
TP_ARGS(sufile, segnum),
TP_STRUCT__entry(
__field(struct inode *, sufile)
__field(__u64, segnum)
),
TP_fast_assign(
__entry->sufile = sufile;
__entry->segnum = segnum;
),
TP_printk("sufile = %p segnum = %llu",
__entry->sufile,
__entry->segnum)
);
TRACE_EVENT(nilfs2_segment_usage_freed,
TP_PROTO(struct inode *sufile,
__u64 segnum),
TP_ARGS(sufile, segnum),
TP_STRUCT__entry(
__field(struct inode *, sufile)
__field(__u64, segnum)
),
TP_fast_assign(
__entry->sufile = sufile;
__entry->segnum = segnum;
),
TP_printk("sufile = %p segnum = %llu",
__entry->sufile,
__entry->segnum)
);
#endif /* _TRACE_NILFS2_H */
/* This part must be outside protection */