tree 11c68ad47a7d823b64fe72833feba89e77cbe832
parent 9317a2b70973050e35246a700ee2baaec4f8bfa9
author Minchan Kim <minchan@kernel.org> 1349739228 -0700
committer Laura Abbott <lauraa@codeaurora.org> 1371576287 -0700

CMA: migrate mlocked pages

Presently CMA cannot migrate mlocked pages so it ends up failing to allocate
contiguous memory space.

This patch makes mlocked pages be migrated out.  Of course, it can affect
realtime processes but in CMA usecase, contiguous memory allocation failing
is far worse than access latency to an mlocked page being variable while
CMA is running.  If someone wants to make the system realtime, he shouldn't
enable CMA because stalls can still happen at random times.

Change-Id: I560f43fdeb94f8fd2a4cc9e2ac12a1593ca38ecb
[akpm@linux-foundation.org: tweak comment text, per Mel]
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: e46a28790e594c0876d1a84270926abf75460f61
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[lauraa@codeaurora.org: Minor context fixups]
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>