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From: Rik van Riel on 13 Nov 2009 13:40
On 11/13/2009 01:15 PM, Mel Gorman wrote:
> If reclaim fails to make sufficient progress, the priority is raised.
> Once the priority is higher, kswapd starts waiting on congestion. However,
> if the zone is below the min watermark then kswapd needs to continue working
> without delay as there is a danger of an increased rate of GFP_ATOMIC
> allocation failure.
>
> This patch changes the conditions under which kswapd waits on
> congestion by only going to sleep if the min watermarks are being met.
>
>
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 90b11e4..bc09547 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -685,6 +685,7 @@ static const char * const vmstat_text[] = {
> "kswapd_inodesteal",
> "kswapd_slept_prematurely_fast",
> "kswapd_slept_prematurely_slow",
> + "kswapd_no_congestion_wait",
>
>
Perhaps better named "kswapd_skip_congestion_wait" ?

Other than that, the patch looks good to me.

Reviewed-by: Rik van Riel <riel(a)redhat.com>

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