lkml.org 
[lkml]   [2002]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] Radix-tree pagecache for 2.5
    Rik van Riel wrote:
    >
    > On Fri, 1 Feb 2002, Alan Cox wrote:
    >
    > > > the prefetch engine will have to restart every 4kB, so we would want to
    > > > use 16MB pages if possible.
    > > >
    > > > How would we allocate large pages? Would there be a boot option to
    > > > reserve an area of RAM for large pages only?
    > >
    > > If you have an rmap all you have to do is to avoid smearing kernel objects
    > > around lots of 16Mb page sets. If need be you can then get a 16Mb page
    > > back just by shuffling user pages.
    > >
    > > It does make the performance analysis much more interesting though.
    >
    > Actually, I suspect that for most workloads the amount of
    > large pages vs. the amount of small pages should be fairly
    > static.
    >
    > In that case we can just reclaim an old large page from
    > the inactive_clean list whenever we want to allocate a new
    > one.
    >
    > As for not putting kernel objects everywhere, this comes
    > naturally with HIGHMEM ;)

    well except when you start doing pagetables high, as Andrea is doing
    (and it makes tons of sense to do that)
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:23    [W:0.032 / U:33.368 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site