From: Jan Kara <jack@suse.cz>
To: Zheng Liu <gnehzuil.liu@gmail.com>
Cc: linux-ext4@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Jan Kara <jack@suse.cz>, Zheng Liu <wenqing.lz@taobao.com>
Subject: Re: [PATCH v3 2/6] ext4: track extent status tree shrinker delay statictics
Date: Wed, 27 Aug 2014 15:26:07 +0200 [thread overview]
Message-ID: <20140827132607.GA22211@quack.suse.cz> (raw)
In-Reply-To: <1407382553-24256-3-git-send-email-wenqing.lz@taobao.com>
On Thu 07-08-14 11:35:49, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@taobao.com>
>
> This commit adds some statictics in extent status tree shrinker. The
> purpose to add these is that we want to collect more details when we
> encounter a stall caused by extent status tree shrinker. Here we count
> the following statictics:
> stats:
> the number of all objects on all extent status trees
> the number of reclaimable objects on lru list
> cache hits/misses
> the last sorted interval
> the number of inodes on lru list
> average:
> scan time for shrinking some objects
> the number of shrunk objects
> maximum:
> the inode that has max nr. of objects on lru list
> the maximum scan time for shrinking some objects
>
> The output looks like below:
> $ cat /proc/fs/ext4/sda1/es_shrinker_info
> stats:
> 28228 objects
> 6341 reclaimable objects
> 5281/631 cache hits/misses
> 586 ms last sorted interval
> 250 inodes on lru list
> average:
> 153 us scan time
> 128 shrunk objects
> maximum:
> 255 inode (255 objects, 198 reclaimable)
> 125723 us max scan time
When reading through this again, I realized that we probably don't want
this file in /proc/fs/ext4 but rather in /sys/kernel/debug/ext4 because
it's really a debugging interface and we don't want any tools to start
using it.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2014-08-27 13:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-07 3:35 [PATCH v3 0/6] ext4: extents status tree shrinker improvement Zheng Liu
2014-08-07 3:35 ` [PATCH v3 1/6] ext4: improve extents status tree trace point Zheng Liu
2014-09-02 2:25 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 2/6] ext4: track extent status tree shrinker delay statictics Zheng Liu
2014-08-27 13:26 ` Jan Kara [this message]
2014-09-04 12:10 ` Zheng Liu
2014-09-04 15:49 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 3/6] ext4: cache extent hole in extent status tree for ext4_da_map_blocks() Zheng Liu
2014-08-27 13:55 ` Jan Kara
2014-09-04 13:05 ` Zheng Liu
2014-09-02 2:43 ` Theodore Ts'o
2014-09-04 13:04 ` Zheng Liu
2014-09-04 15:54 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 4/6] ext4: change lru to round-robin in extent status tree shrinker Zheng Liu
2014-08-27 15:01 ` Jan Kara
2014-09-03 3:37 ` Theodore Ts'o
2014-09-03 15:31 ` Jan Kara
2014-09-03 20:00 ` Theodore Ts'o
2014-09-03 22:14 ` Jan Kara
2014-09-03 22:38 ` Theodore Ts'o
[not found] ` <20140904071553.GA26930@quack.suse.cz>
2014-09-04 15:44 ` Theodore Ts'o
2014-09-08 15:47 ` Jan Kara
2014-08-07 3:35 ` [PATCH v3 5/6] ext4: use a list to track all reclaimable objects for extent status tree Zheng Liu
2014-08-27 15:13 ` Jan Kara
2014-09-03 3:44 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 6/6] ext4: use a garbage collection algorithm to manage object Zheng Liu
2014-08-27 15:24 ` Jan Kara
2014-10-20 14:48 ` [PATCH v3 0/6] ext4: extents status tree shrinker improvement Theodore Ts'o
2014-10-21 10:22 ` Jan Kara
2014-10-21 15:58 ` 刘峥(文卿)
2014-11-03 16:10 ` Jan Kara
2014-11-07 2:38 ` Zheng Liu
2014-11-13 23:40 ` Theodore Ts'o
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