Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 31 Jul 2003 15:32:11 -0700 | From | Andrew Morton <> | Subject | Re: madvise on file pages |
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"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.
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