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authorCyrill Gorcunov <gorcunov@gmail.com>2013-08-13 16:00:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-08-13 17:57:48 -0700
commit41bb3476b361ef38576cf9d539b19bae2ac93167 (patch)
tree907f72f0cc27762a9cb9c2857fe6c360524112f9 /include/asm-generic
parent179ef71cbc085252e3fe6b8159263a7ed1d88ea4 (diff)
downloadop-kernel-dev-41bb3476b361ef38576cf9d539b19bae2ac93167.zip
op-kernel-dev-41bb3476b361ef38576cf9d539b19bae2ac93167.tar.gz
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>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/pgtable.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 2a7e0d1..0807ddf 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -432,6 +432,21 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
{
return pte;
}
+
+static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
+{
+ return pte;
+}
+
+static inline pte_t pte_file_mksoft_dirty(pte_t pte)
+{
+ return pte;
+}
+
+static inline int pte_file_soft_dirty(pte_t pte)
+{
+ return 0;
+}
#endif
#ifndef __HAVE_PFNMAP_TRACKING
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