Messages in this thread | | | Date | Sun, 06 Dec 2009 16:01:44 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH 6/7] wipe_page_reference return SWAP_AGAIN if VM pressulre is low and lock contention is detected. |
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On 12/04/2009 03:45 AM, KOSAKI Motohiro wrote: > From 3fb2a585729a37e205c5ea42ac6c48d4a6c0a29c Mon Sep 17 00:00:00 2001 > From: KOSAKI Motohiro<kosaki.motohiro@jp.fujitsu.com> > Date: Fri, 4 Dec 2009 12:54:37 +0900 > Subject: [PATCH 6/7] wipe_page_reference return SWAP_AGAIN if VM pressulre is low and lock contention is detected. > > Larry Woodman reported AIM7 makes serious ptelock and anon_vma_lock > contention on current VM. because SplitLRU VM (since 2.6.28) remove > calc_reclaim_mapped() test, then shrink_active_list() always call > page_referenced() against mapped page although VM pressure is low. > Lightweight VM pressure is very common situation and it easily makes > ptelock contention with page fault. then, anon_vma_lock is holding > long time and it makes another lock contention. then, fork/exit > throughput decrease a lot.
It looks good to me. Larry, does this patch series resolve your issue?
Acked-by: Rik van Riel <riel@redhat.com>
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