Messages in this thread Patch in this message | | | From | Eric B Munson <> | Subject | [PATCH] mremap.2: Add note about mremap with locked areas | Date | Fri, 28 Aug 2015 14:42:52 -0400 |
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When mremap() is used to move or expand a mapping that is locked with mlock() or equivalent it will attempt to populate the new area. However, like mmap(MAP_LOCKED), mremap() will not fail if the area cannot be populated. Also like mmap(MAP_LOCKED) this might come as a surprise to users and should be noted.
Signed-off-by: Eric B Munson <emunson@akamai.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: linux-man@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- man2/mremap.2 | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/man2/mremap.2 b/man2/mremap.2 index 071adb5..cf884e6 100644 --- a/man2/mremap.2 +++ b/man2/mremap.2 @@ -196,6 +196,17 @@ and the prototype for did not allow for the .I new_address argument. + +If +.BR mremap () +is used to move or expand an area locked with +.BR mlock (2) +or equivalent, the +.BR mremap () +call will make a best effort to populate the new area but will not fail +with +.B ENOMEM +if the area cannot be populated. .SH SEE ALSO .BR brk (2), .BR getpagesize (2), -- 1.9.1
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