Messages in this thread | | | Date | Thu, 30 Apr 2009 20:59:36 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH] vmscan: evict use-once pages first (v2) |
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On Thu, 30 Apr 2009 17:45:36 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> Were you able to tell whether altering /proc/sys/vm/swappiness > appropriately regulated the rate at which the mapped page count > decreased?
That should not make a difference at all for mapped file pages, after the change was merged that makes the VM ignores the referenced bit of mapped active file pages.
Ever since the split LRU code was merged, all that the swappiness controls is the aggressiveness of file vs anonymous LRU scanning.
Currently the kernel has no effective code to protect the page cache working set from streaming IO. Elladan's bug report shows that we do need some kind of protection...
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