mm: save soft-dirty bits on file pages
authorCyrill Gorcunov <gorcunov@gmail.com>
Tue, 13 Aug 2013 23:00:51 +0000 (16:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 14 Aug 2013 00:57:48 +0000 (17:57 -0700)
commit41bb3476b361ef38576cf9d539b19bae2ac93167
tree907f72f0cc27762a9cb9c2857fe6c360524112f9
parent179ef71cbc085252e3fe6b8159263a7ed1d88ea4
mm: save soft-dirty bits on file pages

Andy reported that if file page get reclaimed we lose the soft-dirty bit
if it was there, so save _PAGE_BIT_SOFT_DIRTY bit when page address get
encoded into pte entry.  Thus when #pf happens on such non-present pte
we can restore it back.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
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: Minchan Kim <minchan@kernel.org>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/include/asm/pgtable-2level.h
arch/x86/include/asm/pgtable-3level.h
arch/x86/include/asm/pgtable.h
arch/x86/include/asm/pgtable_types.h
fs/proc/task_mmu.c
include/asm-generic/pgtable.h
mm/fremap.c
mm/memory.c
mm/rmap.c