From: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
To: "MinChan Kim" <minchan.kim@gmail.com>
Cc: "Rik van Riel" <riel@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, lee.schermerhorn@hp.com,
"Hugh Dickins" <hugh@veritas.com>
Subject: Re: [PATCH -mm 04/25] free swap space on swap-in/activation
Date: Mon, 9 Jun 2008 22:38:19 +0900 [thread overview]
Message-ID: <2f11576a0806090638u445209e7m359c03a4776826be@mail.gmail.com> (raw)
In-Reply-To: <28c262360806081914v357f4093ra1e1e9e36f487eb7@mail.gmail.com>
Hi Kim-san,
>> - Can completely optimise the thing away if !CONFIG_SWAP.
>
> I think we can optimize more and more in case of if !CONFIG_SWAP.
> If system are !CONFIG_SWAP, we can never swap out anonymous pages.
>
> Don't we manage anonymous pages with list ?
>
> Such system don't need to insert anonymous pages into lru list when fault occur.
> It is just needless overhead.
>
> Also, If we can't reclaim anonymous pages, don't we need anon rmap facility ?
> I don't know well which subsystems used rmap.
>
> If pageout only use anonymous rmap for pageout,
> we can remove anonymous rmapping code in case of !CONFIG_SWAP
You are right.
but I think rmap isn't bottle neck in embedded system.
Why do you want remove that?
next prev parent reply other threads:[~2008-06-09 13:38 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-06 20:28 [PATCH -mm 00/25] VM pageout scalability improvements (V10) Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 01/25] move isolate_lru_page() to vmscan.c Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 02/25] Use an indexed array for LRU variables Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 5:43 ` KOSAKI Motohiro
2008-06-07 14:47 ` Rik van Riel
2008-06-08 11:22 ` KOSAKI Motohiro
2008-06-07 18:42 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 03/25] use an array for the LRU pagevecs Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 04/25] free swap space on swap-in/activation Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 19:56 ` Rik van Riel
2008-06-09 2:14 ` MinChan Kim
2008-06-09 2:42 ` Rik van Riel
2008-06-09 13:38 ` KOSAKI Motohiro [this message]
2008-06-10 2:30 ` MinChan Kim
2008-06-06 20:28 ` [PATCH -mm 05/25] define page_file_cache() function Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 23:38 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 06/25] split LRU lists into anon & file sets Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 1:22 ` Rik van Riel
2008-06-07 1:52 ` Andrew Morton
2008-06-06 20:28 ` [PATCH -mm 07/25] second chance replacement for anonymous pages Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 6:03 ` KOSAKI Motohiro
2008-06-07 6:43 ` Andrew Morton
2008-06-08 15:04 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 08/25] add some sanity checks to get_scan_ratio Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-08 15:11 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 09/25] fix pagecache reclaim referenced bit check Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-07 1:08 ` Rik van Riel
2008-06-08 10:02 ` Peter Zijlstra
2008-06-06 20:28 ` [PATCH -mm 10/25] add newly swapped in pages to the inactive list Rik van Riel, Rik van Riel
2008-06-07 1:04 ` Andrew Morton
2008-06-06 20:28 ` [PATCH -mm 11/25] more aggressively use lumpy reclaim Rik van Riel, Rik van Riel
2008-06-07 1:05 ` Andrew Morton
2008-06-06 20:28 ` [PATCH -mm 12/25] pageflag helpers for configed-out flags Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 13/25] Noreclaim LRU Infrastructure Rik van Riel, Rik van Riel
2008-06-07 1:05 ` Andrew Morton
2008-06-08 20:34 ` Rik van Riel
2008-06-08 20:57 ` Andrew Morton
2008-06-08 21:32 ` Rik van Riel
2008-06-08 21:43 ` Ray Lee
2008-06-08 23:22 ` Andrew Morton
2008-06-08 23:34 ` Rik van Riel
2008-06-08 23:54 ` Andrew Morton
2008-06-09 0:56 ` Rik van Riel
2008-06-09 6:10 ` Andrew Morton
2008-06-09 13:44 ` Rik van Riel
2008-06-09 2:58 ` Rik van Riel
2008-06-09 5:44 ` Andrew Morton
2008-06-10 19:17 ` Christoph Lameter
2008-06-10 19:37 ` Rik van Riel
2008-06-10 21:33 ` Andrew Morton
2008-06-10 21:48 ` Andi Kleen
2008-06-10 22:05 ` Dave Hansen
2008-06-11 5:09 ` Paul Mundt
2008-06-11 6:16 ` Andrew Morton
2008-06-11 6:29 ` Paul Mundt
2008-06-11 12:06 ` Andi Kleen
2008-06-11 14:09 ` Removing node flags from page->flags was Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure II Andi Kleen
2008-06-11 19:03 ` [PATCH -mm 13/25] Noreclaim LRU Infrastructure Andy Whitcroft
2008-06-11 20:52 ` Andi Kleen
2008-06-11 23:25 ` Christoph Lameter
2008-06-08 22:03 ` Rik van Riel
2008-06-08 21:07 ` KOSAKI Motohiro
2008-06-10 20:09 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 14/25] Noreclaim LRU Page Statistics Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 15/25] Ramfs and Ram Disk pages are non-reclaimable Rik van Riel, Rik van Riel
2008-06-07 1:05 ` Andrew Morton
2008-06-08 4:32 ` Greg KH
2008-06-06 20:28 ` [PATCH -mm 16/25] SHM_LOCKED " Rik van Riel, Rik van Riel
2008-06-07 1:05 ` Andrew Morton
2008-06-07 5:21 ` KOSAKI Motohiro
2008-06-10 21:03 ` Rik van Riel
2008-06-10 21:22 ` Lee Schermerhorn
2008-06-10 21:49 ` Andrew Morton
2008-06-06 20:28 ` [PATCH -mm 17/25] Mlocked Pages " Rik van Riel, Rik van Riel
2008-06-07 1:07 ` Andrew Morton
2008-06-07 5:38 ` KOSAKI Motohiro
2008-06-10 3:31 ` Nick Piggin
2008-06-10 12:50 ` Rik van Riel
2008-06-10 21:14 ` Rik van Riel
2008-06-10 21:43 ` Lee Schermerhorn
2008-06-10 21:57 ` Andrew Morton
2008-06-11 16:01 ` Lee Schermerhorn
2008-06-10 23:48 ` Rik van Riel
2008-06-11 15:29 ` Lee Schermerhorn
2008-06-11 1:00 ` Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 18/25] Downgrade mmap sem while populating mlocked regions Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 19/25] Handle mlocked pages during map, remap, unmap Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 20/25] Mlocked Pages statistics Rik van Riel, Rik van Riel
2008-06-06 20:28 ` [PATCH -mm 21/25] Cull non-reclaimable pages in fault path Rik van Riel, Rik van Riel
2008-06-06 20:29 ` [PATCH -mm 22/25] Noreclaim and Mlocked pages vm events Rik van Riel, Rik van Riel
2008-06-06 20:29 ` [PATCH -mm 23/25] Noreclaim LRU scan sysctl Rik van Riel, Rik van Riel
2008-06-06 20:29 ` [PATCH -mm 24/25] Mlocked Pages: count attempts to free mlocked page Rik van Riel, Rik van Riel
2008-06-06 20:29 ` [PATCH -mm 25/25] Noreclaim LRU and Mlocked Pages Documentation Rik van Riel, Rik van Riel
2008-06-06 21:02 ` [PATCH -mm 00/25] VM pageout scalability improvements (V10) Andrew Morton
2008-06-06 21:08 ` Rik van Riel
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