Messages in this thread | | | Date | Fri, 27 Jul 2007 20:16:32 +0200 | From | Rene Herman <> | Subject | Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23] |
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On 07/27/2007 07:45 PM, Daniel Hazelton wrote:
> Updatedb or another process that uses the FS heavily runs on a users > 256MB P3-800 (when it is idle) and the VFS caches grow, causing memory > pressure that causes other applications to be swapped to disk. In the > morning the user has to wait for the system to swap those applications > back in. > > Questions about it: > Q) Does swap-prefetch help with this? > A) [From all reports I've seen (*)] Yes, it does.
No it does not. If updatedb filled memory to the point of causing swapping (which noone is reproducing anyway) it HAS FILLED MEMORY and swap-prefetch hasn't any memory to prefetch into -- updatedb itself doesn't use any significant memory.
Here's swap-prefetch's author saying the same:
http://lkml.org/lkml/2007/2/9/112
| It can't help the updatedb scenario. Updatedb leaves the ram full and | swap prefetch wants to cost as little as possible so it will never | move anything out of ram in preference for the pages it wants to swap | back in.
Now please finally either understand this, or tell us how we're wrong.
Rene.
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