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| author |   Hugh Dickins <hughd@google.com> | 2013-02-22 16:36:09 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:23 -0800 |
| commit | 9e16b7fb1d066d38d01fd57c449f2640c5d208cb (patch) | |
| tree | 9c9cc35eea61bc16a563cfcdd5468b021daef0fa /mm/memory.c | |
| parent | mm,ksm: FOLL_MIGRATION do migration_entry_wait (diff) | |
| download | linux-dev-9e16b7fb1d066d38d01fd57c449f2640c5d208cb.tar.xz linux-dev-9e16b7fb1d066d38d01fd57c449f2640c5d208cb.zip | |
mm,ksm: swapoff might need to copy
Before establishing that KSM page migration was the cause of my
WARN_ON_ONCE(page_mapped(page))s, I suspected that they came from the
lack of a ksm_might_need_to_copy() in swapoff's unuse_pte() - which in
many respects is equivalent to faulting in a page.
In fact I've never caught that as the cause: but in theory it does at
least need the KSM_RUN_UNMERGE check in ksm_might_need_to_copy(), to
avoid bringing a KSM page back in when it's not supposed to be.
I intended to copy how it's done in do_swap_page(), but have a strong
aversion to how "swapcache" ends up being used there: rework it with
"page != swapcache".
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Petr Holasek <pholasek@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Izik Eidus <izik.eidus@ravellosystems.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions