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Date: Tue, 25 Nov 2008 08:32:31 -0500 From: Rik van Riel <riel@...hat.com> To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> CC: linux-mm@...ck.org, linux-kernel@...r.kernel.org, mel@....ul.ie, akpm@...ux-foundation.org Subject: Re: [PATCH] vmscan: bail out of page reclaim after swap_cluster_max pages KOSAKI Motohiro wrote: >> Sometimes the VM spends the first few priority rounds rotating back >> referenced pages and submitting IO. Once we get to a lower priority, >> sometimes the VM ends up freeing way too many pages. >> >> The fix is relatively simple: in shrink_zone() we can check how many >> pages we have already freed, direct reclaim tasks break out of the >> scanning loop if they have already freed enough pages and have reached >> a lower priority level. >> >> However, in order to do this we do need to know how many pages we already >> freed, so move nr_reclaimed into scan_control. >> >> Signed-off-by: Rik van Riel <riel@...hat.com> >> --- >> Kosaki, this should address the zone scanning pressure issue. > > hmmmm. I still don't like the behavior when priority==DEF_PRIORITY. > but I also should explain by code and benchmark. Well, the behaviour when priority==DEF_PRIORITY is the same as the kernel's behaviour without the patch... > therefore, I'll try to mesure this patch in this week. Looking forward to it. -- All rights reversed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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