Messages in this thread | | | Date | Sat, 2 May 2009 23:24:03 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH] vmscan: evict use-once pages first (v2) |
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On Sun, 3 May 2009 11:15:39 +0800 Wu Fengguang <fengguang.wu@intel.com> wrote:
> Commit 7e9cd484204f(vmscan: fix pagecache reclaim referenced bit > check) tries to address scalability problem when every page get > mapped and referenced, so that logic(which lowed the priority of > mapped pages) could be enabled only on conditions like (priority < > DEF_PRIORITY). > > Or preferably we can explicitly protect the mapped executables, > as illustrated by this patch (a quick prototype).
Over time, given enough streaming IO and idle applications, executables will still be evicted with just this patch.
However, a combination of your patch and mine might do the trick. I suspect that executables are never a very big part of memory, except on small memory systems, so protecting just the mapped executables should not be a scalability problem.
My patch in combination with your patch should make sure that if something gets evicted from the active list, it's not executables - meanwhile, lots of the time streaming IO will completely leave the active file list alone.
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