On Wed, Aug 27, 2014 at 03:26:07PM +0200, Jan Kara wrote:
> On Thu 07-08-14 11:35:49, Zheng Liu wrote:
> > From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
> >
> > 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.
Fair enough. I will fix it in next version.
Thanks,
- Zheng
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