lkml.org 
[lkml]   [2012]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [patch 7/7] mm: reduce rmap overhead for ex-KSM page copies created on swap faults
    On Wed, Dec 19, 2012 at 02:01:19AM -0500, Simon Jeons wrote:
    > On Mon, 2012-12-17 at 13:12 -0500, 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.
    >
    > Is it just a code cleanup instead of reduce rmap overhead?

    Both.


    \
     
     \ /
      Last update: 2012-12-19 19:21    [W:4.159 / U:0.020 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site