Re: [PATCH] vmscan: prevent background aging of anon page in no swapsystem

[Rik van Riel]

On 08/29/2010 11:43 AM, Minchan Kim wrote:

> This patch prevents unnecessary anon pages demotion in not-swapon and
> non-configured swap system. Of course, it could make side effect that
> hot anon pages could swap out when admin does swap on.
> But I think sooner or later it would be steady state.
> So it's not a big problem.
> We could lose someting but gain more thing(TLB flush and unnecessary
> function call to demote anon pages).

A agree that is not a big worry.  I expect virtually all the
systems with swap space will do swapon at boot time.

> I used total_swap_pages because we want to age anon pages
> even though swap full happens.
>
> Cc: Rik van Riel<riel@xxxxxxxxxx>
> Cc: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx>
> Cc: Johannes Weiner<hannes@xxxxxxxxxxx>
> Reported-by: Ying Han<yinghan@xxxxxxxxxx>
> Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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