Re: ~500 megs cached yet 2.6.5 goes into swap hell

[Andrew Morton]

Andy Isaacson <adi@xxxxxxxxxxxxx> wrote:
>
>  But in a related case, I have a background daemon that does a lot of IO
>  (mostly sequential, one page at a time read/modify/write of a multi-GB
>  file) to a filesystem on a separate spindle from my main filesystems.
>  I'd like to use a similar mechanism to say "don't let this program eat
>  my pagecache" that will let the daemon crunch away without severely
>  impacting my desktop work.

fadvise(POSIX_FADV_DONTNEED) is ideal for this.  Run it once per megabyte
or so.
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