lkml.org 
[lkml]   [2009]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH 18/45] writeback: introduce wait queue for balance_dirty_pages()
    From
    Date
    On Thu, 2009-10-08 at 09:58 +0800, Wu Fengguang wrote:
    >
    > > How this runqueue->nr_iowait is handled now ?
    >
    > Good question. io_schedule() has an old comment for throttling IO wait:
    >
    > * But don't do that if it is a deliberate, throttling IO wait (this task
    > * has set its backing_dev_info: the queue against which it should throttle)
    > */
    > void __sched io_schedule(void)
    >
    > So it looks both Jens' and this patch behaves right in ignoring the
    > iowait accounting for balance_dirty_pages() :)

    Well it is a change in behaviour, and I think IOWAIT makes sense when
    we're blocked due to io throttle..

    Hmm?



    \
     
     \ /
      Last update: 2009-10-08 10:13    [W:4.099 / U:0.396 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site