[lkml]   [2012]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch 8/8] mm: reduce rmap overhead for ex-KSM page copies created on swap faults
On 12/12/2012 04:43 PM, Johannes Weiner wrote:
> When ex-KSM pages are faulted from swap cache, the fault handler is
> not capable of re-establishing anon_vma-spanning KSM pages. In this
> case, a copy of the page is created instead, just like during a COW
> break.
> These freshly made copies are known to be exclusive to the faulting
> VMA and there is no reason to go look for this page in parent and
> sibling processes during rmap operations.
> Use page_add_new_anon_rmap() for these copies. This also puts them on
> the proper LRU lists and marks them SwapBacked, so we can get rid of
> doing this ad-hoc in the KSM copy code.
> Signed-off-by: Johannes Weiner <>

Reviewed-by: Rik van Riel <>

 \ /
  Last update: 2012-12-13 00:01    [W:6.670 / U:0.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site