linux-kernel - Re: [PATCH 1/2] mm,vmscan: Kill global shrinker lock.

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Date:   Fri, 24 Nov 2017 08:46:26 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Huang Ying <ying.huang@...el.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Greg Thelen <gthelen@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm,vmscan: Kill global shrinker lock.

On Thu, Nov 16, 2017 at 12:44:22PM -0500, Johannes Weiner wrote:
> On Wed, Nov 15, 2017 at 09:56:02AM +0900, Minchan Kim wrote:
> > @@ -498,6 +498,14 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> >  			sc.nid = 0;
> >  
> >  		freed += do_shrink_slab(&sc, shrinker, nr_scanned, nr_eligible);
> > +		/*
> > +		 * bail out if someone want to register a new shrinker to prevent
> > +		 * long time stall by parallel ongoing shrinking.
> > +		 */
> > +		if (rwsem_is_contended(&shrinker_rwsem)) {
> > +			freed = 1;
> > +			break;
> > +		}
> >  	}
> 
> When you send the formal version, please include
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks for the review, Johannes.