lkml.org 
[lkml]   [2018]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable
    On Fri 01-06-18 10:25:59, Eric W. Biederman wrote:
    > Michal Hocko <mhocko@kernel.org> writes:
    >
    > > On Fri 01-06-18 09:32:42, Eric W. Biederman wrote:
    > >> Michal Hocko <mhocko@kernel.org> writes:
    > > [...]
    > >> > Group leader exiting early without tearing down the whole thread
    > >> > group should be quite rare as well. No question that somebody might do
    > >> > that on purpose though...
    > >>
    > >> The group leader exiting early is a completely legitimate and reasonable
    > >> thing to do, even if it is rare.
    > >
    > > I am not saying it isn't legitimate. But the most common case is the
    > > main thread waiting for its threads or calling exit which would tear the
    > > whole group down. Is there any easy way to achieve this other than tkill
    > > to group leader? Calling exit(3) from the leader performs group exit
    > > IIRC.
    >
    > pthread_exit from the group leader.

    Right, forgot to mention this one but this would be quite exotic, right?


    > > I am not arguing this is non-issue. And it certainly is a problem once
    > > somebody wants to be nasty... I was more interested how often this
    > > really happens for sane workloads.
    >
    > That is a fair question. All I know for certain is that whatever Kirill
    > Tkhai's workload was it was triggering this the slow path.

    Yeah, that was exactly why I've asked that originally. It must be
    something pretty special ;)
    --
    Michal Hocko
    SUSE Labs

    \
     
     \ /
      Last update: 2018-06-04 08:55    [W:4.005 / U:0.180 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site