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>
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