lkml.org 
[lkml]   [2008]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] VM: Implements the swap-out page-clustering technique
    Rik van Riel wrote:
    > On Sun, 07 Sep 2008 18:28:30 -0600
    > Zan Lynx <zlynx@acm.org> wrote:
    >
    >> Rik van Riel wrote:
    >> [cut]
    >>
    >>> On the other hand, you do want to avoid evicting data
    >>> that the process is still using, just because you are
    >>> swapping out a not recently referenced page on a
    >>> nearby virtual address.
    >>>
    >> How about writing the nearby pages to swap anyway and mark the still
    >> in-use pages as SwapCache.
    >>
    >
    > That is what will happen pretty much automatically.
    >

    I agree. As you said, we have two conflicting requirements here: on the
    one hand one likes to swap as many pages as to satisfy the backing
    storage "proper block IO size," on the other hand, one should not make a
    process lose too many pages. The code needs tuning really, I'm going to
    rewrite it making it more flexible according to the suggestion given on
    the mailing list.

    > Another thing the swap out page clustering code could
    > do is move pages that were recently referenced back
    > to the active list, so the VM will not have to scan
    > those pages again.
    >
    >

    I think this is a very good idea, actually the code does this already.

    Thanks.


    \
     
     \ /
      Last update: 2008-09-10 09:17    [W:0.022 / U:61.848 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site