lkml.org 
[lkml]   [2011]   [May]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 6/6] writeback: refill b_io iff empty
    On Wed 04-05-11 15:39:31, Wu Fengguang wrote:
    > To help understand the behavior change, I wrote the writeback_queue_io
    > trace event, and found very different patterns between
    > - vanilla kernel
    > - this patchset plus the sync livelock fixes
    >
    > Basically the vanilla kernel each time pulls a random number of inodes
    > from b_dirty, while the patched kernel tends to pull a fixed number of
    > inodes (enqueue=1031) from b_dirty. The new behavior is very interesting...
    This regularity is really strange. Did you have a chance to look more into
    it? I find it highly unlikely that there would be exactly 1031 dirty inodes
    in b_dirty list every time you call move_expired_inodes()...

    Honza
    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


    \
     
     \ /
      Last update: 2011-05-05 18:39    [W:0.018 / U:29.856 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site