Messages in this thread | | | Date | Sat, 3 Mar 2007 14:58:48 -0800 | From | "Ray Lee" <> | Subject | Re: userspace pagecache management tool |
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On 3/3/07, Andrew Morton <akpm@linux-foundation.org> wrote: > It is to address the "waah, backups fill my memory with pagecache" and the > "waah, updatedb swapped everything out" and the "waah, copying a DVD > gobbled all my memory" problems.
Is the updatedb problem really due to pagecache?
> When running > > pagecache-management.sh dd if=100-mb-file of=foo > or > pagecache-management.sh cp -a /usr/src/linux-2.6.20 /usr/src/foo > > the amount of pagecache in the machine is pretty much unaltered. Maybe a > megabyte of additional cache in the second case, because of ext3 indirect > blocks.
ray@phoenix:~/work/home/pagecache-management$ grep ext3_i /proc/slabinfo; ./pagecache-management.sh sudo updatedb; grep ext3_i /proc/slabinfo ext3_inode_cache 21024 23722 1584 2 1 : tunables 24 12 0 : slabdata 11861 11861 0 ext3_inode_cache 41332 41332 1584 2 1 : tunables 24 12 0 : slabdata 20666 20666 0 ray@phoenix:~/work/home/pagecache-management$ echo $(( 1584 * (41332-21024) )) 32167872
Or is there a /proc/sys/vm/* knob that can be tweaked for this before/after the updatedb?
But yeah, I for one would happily submit patches to upstream authors to address this there. There's no reason code should be making the kernel guess its intention on these things.
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