Messages in this thread | | | Date | Wed, 10 Jan 2007 22:57:20 -0800 | From | Andrew Morton <> | Subject | Re: O_DIRECT question |
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On Thu, 11 Jan 2007 14:45:12 +0800 Aubrey <aubreylee@gmail.com> wrote:
> > > > In the interim you could do the old "echo 3 > /proc/sys/vm/drop_caches" > > thing, but that's terribly crude - drop_caches is really only for debugging > > and benchmarking. > > > Yes. This method can drop caches, but will fragment memory.
That's what page reclaim will do as well.
What you want is Mel's antifragmentation work, or lumpy reclaim.
> This is > not what I want. I want cache is limited to a tunable value of the > whole memory. For example, if total memory is 128M, is there a way to > trigger reclaim when cache size > 16M?
If there was, it'd "fragment memory" as well.
You might get a little benefit from increasing /proc/sys/vm/min_free_kbytes, but not much. Some page allocation tweaks would aid that.
But basically, to do this well, serious work is needed.
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