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author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2010-08-09 17:20:11 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-09 20:45:04 -0700 |
commit | d2997b1042ec150616c1963b5e5e919ffd0b0ebf (patch) | |
tree | c970746ad3d5c3e0ccbd1695d07144dbe4534ec4 /drivers/cpuidle | |
parent | 966cca029f739716fbcc8068b8c6dfe381f86fc3 (diff) | |
download | op-kernel-dev-d2997b1042ec150616c1963b5e5e919ffd0b0ebf.zip op-kernel-dev-d2997b1042ec150616c1963b5e5e919ffd0b0ebf.tar.gz |
hibernation: freeze swap at hibernation
When taking a memory snapshot in hibernate_snapshot(), all (directly
called) memory allocations use GFP_ATOMIC. Hence swap misusage during
hibernation never occurs.
But from a pessimistic point of view, there is no guarantee that no page
allcation has __GFP_WAIT. It is better to have a global indication "we
enter hibernation, don't use swap!".
This patch tries to freeze new-swap-allocation during hibernation. (All
user processes are frozenm so swapin is not a concern).
This way, no updates will happen to swap_map[] between
hibernate_snapshot() and save_image(). Swap is thawed when swsusp_free()
is called. We can be assured that swap corruption will not occur.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Hugh Dickins <hughd@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Ondrej Zary <linux@rainbow-software.org>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/cpuidle')
0 files changed, 0 insertions, 0 deletions