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madvise.2: Improve MADV_DONTNEED description 

Cowritten-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-02-06 16:48:54 +01:00
parent 8bdce466c4
commit d5e9c9bb50
1 changed files with 9 additions and 1 deletions
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10
man2/madvise.2
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@ -119,11 +119,19 @@ After a successful
operation,
the semantics of memory access in the specified region are changed:
subsequent accesses of pages in the range will succeed, but will result
in either reloading of the memory contents from the underlying mapped file
in either repopulating the memory contents from the
up-to-date contents of the underlying mapped file
(for shared file mappings, shared anonymous mappings,
and shmem-based techniques such as System V shared memory segments)
or zero-fill-on-demand pages for anonymous private mappings.
Note that, when applied to shared mappings,
.BR MADV_DONTNEED
might not lead to immediate freeing of the pages in the range.
The kernel is free to delay freeing the pages until an appropriate moment.
The resident set size (RSS) of the calling process will be immediately
reduced however.
.B MADV_DONTNEED
cannot be applied to locked pages or Huge TLB pages.
.\"