Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 1 Aug 2003 23:39:53 +0200 | From | Antonio Vargas <> | Subject | Re: madvise on file pages |
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On Thu, Jul 31, 2003 at 03:32:11PM -0700, Andrew Morton wrote: > "Muthian S" <muthian_s@hotmail.com> wrote: > > > > Hi, > > > > Could someone inform as to what is the behavior when madvise DONTNEED is > > called on pages that are mmap'd from local files mapped with MAP_SHARED, > > i.e. they share the same page that the file cache does. > > The pages are unmapped from the calling process's pagetables. We don't > actually free the physical pages. > > > In such cases, can > > madvise be made to release specific pages in the file cache by mmap-ing the > > relevant file segment ? > > No. > > 2.6 kernels implement the fadvise() syscall (accessible by glibc's > posix_fadvise() function) which will do this.
Perhaps we could send the page to the least-used end of the page lists?
-- winden/network
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