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

[Johannes Weiner]

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@xxxxxxxxxxx>