lkml.org 
[lkml]   [2009]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: regression in page writeback
    On Wed, 23 Sep 2009 08:22:20 +0800 Wu Fengguang <fengguang.wu@intel.com> wrote:

    > Jens' per-bdi writeback has another improvement. In 2.6.31, when
    > superblocks A and B both have 100000 dirty pages, it will first
    > exhaust A's 100000 dirty pages before going on to sync B's.

    That would only be true if someone broke 2.6.31. Did they?

    SYSCALL_DEFINE0(sync)
    {
    wakeup_pdflush(0);
    sync_filesystems(0);
    sync_filesystems(1);
    if (unlikely(laptop_mode))
    laptop_sync_completion();
    return 0;
    }

    the sync_filesystems(0) is supposed to non-blockingly start IO against
    all devices. It used to do that correctly. But people mucked with it
    so perhaps it no longer does.



    \
     
     \ /
      Last update: 2009-09-23 02:59    [W:0.020 / U:150.704 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site