lkml.org 
[lkml]   [2004]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] [Request for inclusion] Filesystem in Userspace


    On Thu, 18 Nov 2004, Miklos Szeredi wrote:
    >
    > OK, sorry. I'd rephrase it then to say will the system allow _all_
    > it's pages to be used for file data?

    Yup, pretty much.

    It's actually even _normal_ behaviour for many of the core users of shared
    files. People who really do databases get quite upset if you don't let
    them mmap as much memory as they want, because for them, they really tune
    their cache sizes for the size of memory, and they think the OS (and
    anything else, for that matter) just gets in their way. They want 99% of
    memory to be used for the shared mapping, and the remaining 1% for their
    code.

    (That's a bit extreme, but you get the idea).

    Historically, we've often tried to "partition" memory in various ways (ie
    "the buffer cache can only grow up to 40% of real memory" etc). It ends up
    being good for some things (watermarks etc), but almost ever time it ends
    up being bad as a hard _limit_. So yes, the kernel tends to let people
    do what they think they want to do.

    "Give them rope",

    Linus
    -
    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: 2009-11-18 23:46    [W:4.278 / U:0.156 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site