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Message-ID: <4F8326FD.8020507@redhat.com> Date: Mon, 09 Apr 2012 14:14:21 -0400 From: Rik van Riel <riel@...hat.com> To: Alexey Ivanov <rbtz@...dex-team.ru> CC: "gnehzuil.lzheng@...il.com" <gnehzuil.lzheng@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org> Subject: Re: mapped pagecache pages vs unmapped pages On 04/09/2012 01:11 PM, Alexey Ivanov wrote: > Thanks for the hint! > > Can anyone clarify the reason of not using zone->inactive_ratio in inactive_file_is_low_global()? New anonymous pages start out on the active anon list, and are always referenced. If memory fills up, they may end up getting moved to the inactive anon list; being referenced while on the inactive anon list is enough to get them promoted back to the active list. New file pages start out on the INACTIVE file list, and start their lives not referenced at all. Due to readahead extra reads, many file pages may never be referenced. Only file pages that are referenced twice make it onto the active list. This means the inactive file list has to be large enough for all the readahead buffers, and give pages enough time on the list that frequently accessed ones can get accessed twice and promoted. http://linux-mm.org/PageReplacementDesign -- 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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