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    SubjectRe: [PATCH 1/2] mm,vmscan: Kill global shrinker lock.
    On Mon 20-11-17 01:33:09, Christoph Hellwig wrote:
    > On Mon, Nov 20, 2017 at 10:25:26AM +0100, Michal Hocko wrote:
    > > On Fri 17-11-17 09:35:21, Christoph Hellwig wrote:
    > > > On Tue, Nov 14, 2017 at 06:37:42AM +0900, Tetsuo Handa wrote:
    > > > > Since do_shrink_slab() can reschedule, we cannot protect shrinker_list
    > > > > using one RCU section. But using atomic_inc()/atomic_dec() for each
    > > > > do_shrink_slab() call will not impact so much.
    > > >
    > > > But you could use SRCU..
    > >
    > > Davidlohr has tried that already http://lkml.kernel.org/r/1434398602.1903.15.camel@stgolabs.net
    > > and failed. Doing SRCU inside core kernel is not seen with a great
    > > support...
    >
    > I can't actually find any objection in that thread. What's the problem
    > Davidlohr ran into?

    The patch has been dropped because allnoconfig failed to compile back
    then http://lkml.kernel.org/r/CAP=VYLr0rPWi1aeuk4w1On9CYRNmnEWwJgGtaX=wEvGaBURtrg@mail.gmail.com
    I have problem to find the follow up discussion though. The main
    argument was that SRC is not generally available and so the core
    kernel should rely on it.
    --
    Michal Hocko SUSE Labs

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