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From: Greg KH <greg@kroah.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>,
	linux-kernel@vger.kernel.org, lee.schermerhorn@hp.com,
	kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org,
	eric.whitney@hp.com
Subject: Re: [PATCH -mm 15/25] Ramfs and Ram Disk pages are non-reclaimable
Date: Sat, 7 Jun 2008 21:32:10 -0700	[thread overview]
Message-ID: <20080608043210.GB21251@kroah.com> (raw)
In-Reply-To: <20080606180510.87a49e19.akpm@linux-foundation.org>

On Fri, Jun 06, 2008 at 06:05:10PM -0700, Andrew Morton wrote:
> 
> Also, I expect there are a whole host of pseudo-filesystems (sysfs?)
> which have this problem.  Does the patch address all of them?  If not,
> can we come up with something which _does_ address them all without
> having to hunt down and change every such fs?

sysfs used to have this issue, until the people at IBM rewrote the whole
backing store for sysfs so that now it is reclaimable and pages out
quite nicely when there is memory pressure.  That's how they run 20,000
disks on the s390 boxes with no memory :)

But it would be nice to solve the issue "generically" for ram based
filesystems, if possible (usbfs, securityfs, debugfs, etc.)

thanks,

greg k-h

  reply	other threads:[~2008-06-08  4:37 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
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 [this message]
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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