Messages in this thread | | | Date | Fri, 30 Apr 2004 03:52:33 -0400 | From | Jeff Garzik <> | Subject | Re: ~500 megs cached yet 2.6.5 goes into swap hell |
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Andrew Morton wrote: > Andy Isaacson <adi@hexapodia.org> 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.
Sweet. I'm so happy you added posix_fadvise (way back when), and even happier to hear this.
Does our fadvise support len==0 ("I mean the whole file")? That's defined in POSIX, and would allow a compliant app to simply POSIX_FADV_DONTNEED once at the beginning.
Jeff
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