Re: [PATCH] mm,vmscan: Use accurate values for zone_reclaimable()checks

[Tejun Heo]

Hello,

On Fri, Oct 23, 2015 at 06:42:43AM +0900, Tetsuo Handa wrote:
> Then, isn't below change easier to backport which will also alleviate
> needlessly burning CPU cycles?
> 
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3385,6 +3385,7 @@ retry:
>  	((gfp_mask & __GFP_REPEAT) && pages_reclaimed < (1 << order))) {
>  		/* Wait for some write requests to complete then retry */
>  		wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50);
> +		schedule_timeout_uninterruptible(1);
>  		goto retry;
>  	}

Yeah, that works too.  It should still be put on a dedicated wq with
MEM_RECLAIM tho.

Thanks.

-- 
tejun
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