lkml.org 
[lkml]   [2013]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH -v2 -tip] fix race between stop_two_cpus and stop_cpus
    On Fri, Nov 01, 2013 at 10:41:46AM -0400, Rik van Riel wrote:
    > Subject: fix race between stop_two_cpus and stop_cpus
    >
    > There is a race between stop_two_cpus, and the global stop_cpus.
    >
    > It is possible for two CPUs to get their stopper functions queued
    > "backwards" from one another, resulting in the stopper threads
    > getting stuck, and the system hanging. This can happen because
    > queuing up stoppers is not synchronized.
    >
    > This patch adds synchronization between stop_cpus (a rare operation),
    > and stop_two_cpus.
    >
    > Signed-off-by: Rik van Riel <riel@redhat.com>
    > ---
    > v2: use lglock, as suggested by Peter & Mel, thanks to both of you
    > for insisting on nicer code :)
    >

    This is a tad more comprehensible :). Thanks!

    Acked-by: Mel Gorman <mgorman@suse.de>

    --
    Mel Gorman
    SUSE Labs


    \
     
     \ /
      Last update: 2013-11-01 16:21    [W:2.735 / U:0.012 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site