lkml.org 
[lkml]   [2002]   [Aug]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] Rmap speedup
    Daniel Phillips wrote:
    >
    > This patch eliminates about 35% of the raw rmap setup/teardown overhead by
    > adopting a new locking interface that allows the add_rmaps to be batched in
    > copy_page_range.

    Well that's fairly straightforward, thanks. Butt-ugly though ;)

    Don't bother doing teardown yet. I have patches which batch
    all the zap_page_range activity into 16-page chunks, so we
    eventually end up in a single function with 16 virtually-contiguous
    pages to release. Adding the batched locking to that will
    be simple.

    Sigh. I have a test which sends the 2.5.30 VM into a five-minute
    coma and which immediately panics latest -ac with pte_chain oom.
    Remind me again why all this is worth it?

    I'll port your stuff to 2.5 over the weekend, let you know...
    -
    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 13:27    [W:4.074 / U:0.172 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site