linux-kernel - Re: [PATCH] mm/vmscan: Do not block forever atshrink_inactive

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Date:	Tue, 3 Jun 2014 14:43:22 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
cc:	Motohiro.Kosaki@...fujitsu.com, david@...morbit.com,
	riel@...hat.com, kosaki.motohiro@...fujitsu.com,
	fengguang.wu@...el.com, kamezawa.hiroyu@...fujitsu.com,
	akpm@...ux-foundation.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH] mm/vmscan: Do not block forever
 atshrink_inactive_list().

On Mon, 26 May 2014, Tetsuo Handa wrote:

> In shrink_inactive_list(), we do not insert delay at
> 
>   if (!sc->hibernation_mode && !current_is_kswapd())
>     wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
> 
> if sc->hibernation_mode != 0.
> Follow the same reason, we should not insert delay at
> 
>   while (unlikely(too_many_isolated(zone, file, sc))) {
>     congestion_wait(BLK_RW_ASYNC, HZ/10);
> 
>     /* We are about to die and free our memory. Return now. */
>     if (fatal_signal_pending(current))
>       return SWAP_CLUSTER_MAX;
>   }
> 
> if sc->hibernation_mode != 0.
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> ---
>  mm/vmscan.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 32c661d..89c42ca 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1362,6 +1362,9 @@ static int too_many_isolated(struct zone *zone, int file,
>  	if (current_is_kswapd())
>  		return 0;
>  
> +	if (sc->hibernation_mode)
> +		return 0;
> +
>  	if (!global_reclaim(sc))
>  		return 0;
>  

This isn't the only too_many_isolated() functions that do a delay, how is 
the too_many_isolated() in mm/compaction.c different?
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