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author | Cyrill Gorcunov <gorcunov@gmail.com> | 2013-10-16 13:46:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-10-16 21:35:52 -0700 |
commit | c3d16e16522fe3fe8759735850a0676da18f4b1d (patch) | |
tree | 430c8b815eff06ed9fbfeefa30695d622f65660b /mm/memory.c | |
parent | d8e2162cf0bbc49bb3fe1ac689618f6629c9150b (diff) | |
download | kernel_goldelico_gta04-c3d16e16522fe3fe8759735850a0676da18f4b1d.zip kernel_goldelico_gta04-c3d16e16522fe3fe8759735850a0676da18f4b1d.tar.gz kernel_goldelico_gta04-c3d16e16522fe3fe8759735850a0676da18f4b1d.tar.bz2 |
mm: migration: do not lose soft dirty bit if page is in migration state
If page migration is turned on in config and the page is migrating, we
may lose the soft dirty bit. If fork and mprotect are called on
migrating pages (once migration is complete) pages do not obtain the
soft dirty bit in the correspond pte entries. Fix it adding an
appropriate test on swap entries.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r-- | mm/memory.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index ca00039..f7b7692 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -837,6 +837,8 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, */ make_migration_entry_read(&entry); pte = swp_entry_to_pte(entry); + if (pte_swp_soft_dirty(*src_pte)) + pte = pte_swp_mksoft_dirty(pte); set_pte_at(src_mm, addr, src_pte, pte); } } |