From: Rik van Riel <riel@redhat.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org, Eric Whitney <eric.whitney@hp.com>
Subject: Re: [PATCH -mm 14/24] Ramfs and Ram Disk pages are unevictable
Date: Thu, 12 Jun 2008 13:29:52 -0400 [thread overview]
Message-ID: <20080612132952.568226f6@cuia.bos.redhat.com> (raw)
In-Reply-To: <200806121054.19253.nickpiggin@yahoo.com.au>
On Thu, 12 Jun 2008 10:54:18 +1000
Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> On Thursday 12 June 2008 04:42, Rik van Riel wrote:
> > From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
> >
> > Christoph Lameter pointed out that ram disk pages also clutter the
> > LRU lists. When vmscan finds them dirty and tries to clean them,
> > the ram disk writeback function just redirties the page so that it
> > goes back onto the active list. Round and round she goes...
> This isn't the case for brd any longer. It doesn't use the buffer
> cache as its backing store, so the buffer cache is reclaimable.
What does that mean?
I know that pages of files that got paged into the page
cache from the ramdisk can be evicted (back to the ram
disk), but how do the brd pages themselves behave?
--
All Rights Reversed
next prev parent reply other threads:[~2008-06-12 17:30 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-11 18:42 [PATCH -mm 00/24] VM pageout scalability improvements (V12) Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 01/24] vmscan: move isolate_lru_page() to vmscan.c Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 02/24] vmscan: Use an indexed array for LRU variables Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 03/24] swap: use an array for the LRU pagevecs Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 04/24] vmscan: free swap space on swap-in/activation Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 05/24] define page_file_cache() function Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 06/24] vmscan: split LRU lists into anon & file sets Rik van Riel
2008-06-13 0:39 ` Hiroshi Shimamoto
2008-06-13 17:48 ` [PATCH] fix printk in show_free_areas Rik van Riel
2008-06-13 20:21 ` [PATCH] collect lru meminfo statistics from correct offset Lee Schermerhorn
2008-06-15 15:07 ` [PATCH] fix printk in show_free_areas KOSAKI Motohiro
2008-06-11 18:42 ` [PATCH -mm 07/24] vmscan: second chance replacement for anonymous pages Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 08/24] vmscan: fix pagecache reclaim referenced bit check Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 09/24] vmscan: add newly swapped in pages to the inactive list Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 10/24] more aggressively use lumpy reclaim Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 11/24] pageflag helpers for configed-out flags Rik van Riel
2008-06-11 20:01 ` Andrew Morton
2008-06-11 20:08 ` Rik van Riel
2008-06-11 20:23 ` Lee Schermerhorn
2008-06-11 20:30 ` Rik van Riel
2008-06-11 20:28 ` Lee Schermerhorn
2008-06-11 20:32 ` Rik van Riel
2008-06-11 20:43 ` Lee Schermerhorn
2008-06-11 20:48 ` Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 12/24] Unevictable LRU Infrastructure Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 13/24] Unevictable LRU Page Statistics Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 14/24] Ramfs and Ram Disk pages are unevictable Rik van Riel
2008-06-12 0:54 ` Nick Piggin
2008-06-12 17:29 ` Rik van Riel [this message]
2008-06-12 17:37 ` Nick Piggin
2008-06-12 17:50 ` Rik van Riel
2008-06-12 17:57 ` Nick Piggin
2008-06-11 18:42 ` [PATCH -mm 15/24] SHM_LOCKED " Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 16/24] mlock: mlocked " Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 17/24] mlock: downgrade mmap sem while populating mlocked regions Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 18/24] mmap: handle mlocked pages during map, remap, unmap Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 19/24] vmstat: mlocked pages statistics Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 20/24] swap: cull unevictable pages in fault path Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 21/24] vmstat: unevictable and mlocked pages vm events Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 22/24] vmscan: unevictable LRU scan sysctl Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 23/24] mlock: count attempts to free mlocked page Rik van Riel
2008-06-11 18:42 ` [PATCH -mm 24/24] doc: unevictable LRU and mlocked pages documentation Rik van Riel
2008-06-12 5:34 ` [PATCH -mm 00/24] VM pageout scalability improvements (V12) Andrew Morton
2008-06-12 13:31 ` Rik van Riel
2008-06-16 5:32 ` KOSAKI Motohiro
2008-06-16 6:20 ` Andrew Morton
2008-06-16 6:22 ` KOSAKI Motohiro
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