linux-kernel - Re: [PATCH 3/4] f2fs: introduce trace points in f2fs filesystem

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Date:	Mon, 14 Jan 2013 10:28:35 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Pankaj Kumar <pankaj.km@...sung.com>
Subject: Re: [PATCH 3/4] f2fs: introduce trace points in f2fs filesystem

2013-01-12 (토), 14:41 +0900, Namjae Jeon:
> From: Namjae Jeon <namjae.jeon@...sung.com>
> 
> #> cat /sys/kernel/debug/tracing/events/f2fs/enable
> 0
> #> echo 1 > /sys/kernel/debug/tracing/events/f2fs/enable
> #> cat /sys/kernel/debug/tracing/events/f2fs/enable
> 1
> 
> #> mount -t f2fs /dev/sdb3  /mnt/
> #>
> #> cat /sys/kernel/debug/tracing/trace
> # tracer: nop
> #
> #TASK-PID    CPU#    TIMESTAMP  FUNCTION
> #   | |       |          |         |
>  mount-423   [001]    49.879188: f2fs_iget: dev 8,19 ino 2
>  mount-423   [001]    49.879215: f2fs_get_page: dev 8,19  page_index 81, type 2
>  mount-423   [001]    49.879224: f2fs_readpage: dev 8,19 ino 2 page_index 81
>  mount-423   [001]    49.879819: f2fs_get_page: dev 8,19  page_index 83, type 2
>  mount-423   [001]    49.879830: f2fs_readpage: dev 8,19 ino 2 page_index 83
>  mount-423   [001]    49.880434: f2fs_get_page: dev 8,19  page_index 593, type 2
>  mount-423   [001]    49.880442: f2fs_readpage: dev 8,19 ino 2 page_index 593
>  mount-423   [001]    49.889931: f2fs_get_page: dev 8,19  page_index 595, type 2
>  mount-423   [001]    49.889939: f2fs_readpage: dev 8,19 ino 2 page_index 595
>  mount-423   [001]    49.892169: f2fs_get_page: dev 8,19  page_index 594, type 2
>  mount-423   [001]    49.892186: f2fs_readpage: dev 8,19 ino 2 page_index 594
>  ...
>  ..
> 
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Pankaj Kumar <pankaj.km@...sung.com>
> ---
>  fs/f2fs/checkpoint.c        |   17 +
>  fs/f2fs/data.c              |   17 +
>  fs/f2fs/file.c              |   14 +
>  fs/f2fs/inode.c             |   10 +
>  fs/f2fs/namei.c             |    7 +-
>  fs/f2fs/node.c              |   23 +-
>  fs/f2fs/segment.c           |    5 +
>  fs/f2fs/super.c             |    4 +
>  include/trace/events/f2fs.h | 1220 +++++++++++++++++++++++++++++++++++++++++++

IMO, it needs to split this patch into two independent patches like:
1. adding a header file to the event subsystem, and
2. introducing tracepoints in f2fs.

Then, we need to get acks from all the related maintainers.

Moreover, it is obvious that the patch-set should describe each of
tracepoints precisely and concretely.

Anyway, it must be a valuable job. :)
Thanks,

-- 
Jaegeuk Kim
Samsung

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