Re: [PATCH] Reclaim orphaned swap pages

["Patrick O'Rourke" <orourke@missioncriticallinux.com>]

Stephen Tweedie wrote:

 
> The patch works completely differently to the release-on-exit diffs:
> this one works in refill_inactive(), so has zero impact on the hot
> paths.  It also works by looking for such orphaned pages in the swap
> cache, not by examining swap entries --- it is much cheaper to find
> a swap entry for a given page than to find the swap cache page for a
> given swap entry.

It seems we would still have the situation whereby a process will be unable
to allocate memory because vm_enough_memory() fails, even though there is
sufficient orphaned swap pages available to satisfy the request. Isn't it
possible there may be enough free memory such that refill_inactive_scan()
isn't running, but still not enough to satisfy vm_enough_memory()?

Pat

-- 
Patrick O'Rourke
978.606.0236
orourke@missioncriticallinux.com

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