Cyrill Gorcunov 179ef71cbc mm: save soft-dirty bits on swapped pages ... Andy Lutomirski reported that if a page with _PAGE_SOFT_DIRTY bit set get swapped out, the bit is getting lost and no longer available when pte read back. To resolve this we introduce _PTE_SWP_SOFT_DIRTY bit which is saved in pte entry for the page being swapped out. When such page is to be read back from a swap cache we check for bit presence and if it's there we clear it and restore the former _PAGE_SOFT_DIRTY bit back. One of the problem was to find a place in pte entry where we can save the _PTE_SWP_SOFT_DIRTY bit while page is in swap. The _PAGE_PSE was chosen for that, it doesn't intersect with swap entry format stored in pte. 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> Reviewed-by: Minchan Kim <minchan@kernel.org> Reviewed-by: 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>		2013-08-13 17:57:47 -07:00
..
array.c	kthread: Prevent unpark race which puts threads on the wrong cpu	2013-04-12 14:18:43 +02:00
base.c	proc_fill_cache(): clean up, get rid of pointless find_inode_number() use	2013-06-29 12:57:19 +04:00
cmdline.c
consoles.c	console: rename acquire/release_console_sem() to console_lock/unlock()	2011-01-26 10:50:06 +10:00
cpuinfo.c
devices.c	proc: use seq_puts()/seq_putc() where possible	2011-01-13 08:03:16 -08:00
fd.c	proc_fill_cache(): just make instantiate_t return int	2013-06-29 12:57:18 +04:00
fd.h	proc: Move proc_fd() to fs/proc/fd.h	2013-05-01 17:29:39 -04:00
generic.c	[readdir] convert procfs	2013-06-29 12:56:32 +04:00
inode.c	proc: Split the namespace stuff out into linux/proc_ns.h	2013-05-01 17:29:39 -04:00
internal.h	proc_fill_cache(): just make instantiate_t return int	2013-06-29 12:57:18 +04:00
interrupts.c
Kconfig	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
kcore.c	fs/proc/kcore.c: using strlcpy() instead of strncpy()	2013-07-03 16:08:02 -07:00
kmsg.c	kmsg: honor dmesg_restrict sysctl on /dev/kmsg	2013-06-12 16:29:44 -07:00
loadavg.c
Makefile	mm, vmalloc: move get_vmalloc_info() to vmalloc.c	2013-04-29 15:54:33 -07:00
meminfo.c	mm, vmalloc: move get_vmalloc_info() to vmalloc.c	2013-04-29 15:54:33 -07:00
namespaces.c	proc_fill_cache(): just make instantiate_t return int	2013-06-29 12:57:18 +04:00
nommu.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
page.c	kpageflags: fix wrong KPF_THP on non-huge compound pages	2012-10-09 16:23:00 +09:00
proc_devtree.c	proc_devtree: Replace include linux/module.h with linux/export.h	2013-05-04 15:31:01 -04:00
proc_net.c	[readdir] convert procfs	2013-06-29 12:56:32 +04:00
proc_sysctl.c	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
proc_tty.c	proc: use seq_puts()/seq_putc() where possible	2011-01-13 08:03:16 -08:00
root.c	[readdir] convert procfs	2013-06-29 12:56:32 +04:00
self.c	Include missing linux/slab.h inclusions	2013-04-29 15:42:01 -04:00
softirqs.c	proc: use seq_puts()/seq_putc() where possible	2011-01-13 08:03:16 -08:00
stat.c	stat: Use size_t for sizes instead of unsigned	2013-02-01 12:32:08 +02:00
task_mmu.c	mm: save soft-dirty bits on swapped pages	2013-08-13 17:57:47 -07:00
task_nommu.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
uptime.c	fs/proc/uptime.c:uptime_proc_show(): use get_monotonic_boottime()	2013-07-03 16:08:02 -07:00
version.c
vmcore.c	s390/kdump: Disable mmap for s390	2013-07-18 13:40:18 +02:00