linux-toradex.git/fs/proc/page.c, branch v3.4.3

pagemap: export KPF_THP

2012-03-22T00:54:57+00:00

This flag shows that a given page is a subpage of a transparent hugepage.
It helps us debug and test the kernel by showing physical address of thp.

Signed-off-by: Naoya Horiguchi 
Reviewed-by: Wu Fengguang 
Reviewed-by: KAMEZAWA Hiroyuki 
Acked-by: KOSAKI Motohiro 
Cc: David Rientjes 
Cc: Andi Kleen 
Cc: Andrea Arcangeli 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

thp: remove PG_buddy

2011-01-14T01:32:43+00:00

PG_buddy can be converted to _mapcount == -2.  So the PG_compound_lock can
be added to page->flags without overflowing (because of the sparse section
bits increasing) with CONFIG_X86_PAE=y and CONFIG_X86_PAT=y.  This also
has to move the memory hotplug code from _mapcount to lru.next to avoid
any risk of clashes.  We can't use lru.next for PG_buddy removal, but
memory hotplug can use lru.next even more easily than the mapcount
instead.

Signed-off-by: Andrea Arcangeli 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kpagecount: add slab page checking because _mapcount is in a union

2011-01-13T16:03:17+00:00

Add a PageSlab() check before adding the _mapcount value to /kpagecount.
page->_mapcount is in a union with the SLAB structure so for pages
controlled by SLAB, page_mapcount() returns nonsense.

Signed-off-by: Petr Holasek 
Cc: Wu Fengguang 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: export uncached bit properly in /proc/kpageflags

2010-09-10T01:57:23+00:00

Fix the left-over old ifdef for PG_uncached in /proc/kpageflags.  Now it's
used by x86, too.

Signed-off-by: Takashi Iwai 
Cc: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: export stable page flags

2009-12-16T11:19:59+00:00

Rename get_uflags() to stable_page_flags() and make it a global function
for use in the hwpoison page flags filter, which need to compare user
page flags with the value provided by user space.

Also move KPF_* to kernel-page-flags.h for use by user space tools.

Acked-by: Matt Mackall 
Signed-off-by: Andi Kleen 
CC: Nick Piggin 
CC: Christoph Lameter 
Signed-off-by: Wu Fengguang 
Signed-off-by: Andi Kleen

pagemap: export KPF_HWPOISON

2009-10-08T14:36:39+00:00

This flag indicates a hardware detected memory corruption on the page.
Any future access of the page data may bring down the machine.

Signed-off-by: Wu Fengguang 
Cc: Andi Kleen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ksm: identify PageKsm pages

2009-09-22T14:17:31+00:00

KSM will need to identify its kernel merged pages unambiguously, and
/proc/kpageflags will probably like to do so too.

Since KSM will only be substituting anonymous pages, statistics are best
preserved by making a PageKsm page a special PageAnon page: one with no
anon_vma.

But KSM then needs its own page_add_ksm_rmap() - keep it in ksm.h near
PageKsm; and do_wp_page() must COW them, unlike singly mapped PageAnons.

Signed-off-by: Hugh Dickins 
Signed-off-by: Chris Wright 
Signed-off-by: Izik Eidus 
Cc: Wu Fengguang 
Cc: Andrea Arcangeli 
Cc: Rik van Riel 
Cc: Wu Fengguang 
Cc: Balbir Singh 
Cc: Hugh Dickins 
Cc: KAMEZAWA Hiroyuki 
Cc: Lee Schermerhorn 
Cc: Avi Kivity 
Cc: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove CONFIG_UNEVICTABLE_LRU config option

2009-06-17T02:47:42+00:00

Currently, nobody wants to turn UNEVICTABLE_LRU off.  Thus this
configurability is unnecessary.

Signed-off-by: KOSAKI Motohiro 
Cc: Johannes Weiner 
Cc: Andi Kleen 
Acked-by: Minchan Kim 
Cc: David Woodhouse 
Cc: Matt Mackall 
Cc: Rik van Riel 
Cc: Lee Schermerhorn 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: export more page flags in /proc/kpageflags

2009-06-17T02:47:38+00:00

Export all page flags faithfully in /proc/kpageflags.

	11. KPF_MMAP		(pseudo flag) memory mapped page
	12. KPF_ANON		(pseudo flag) memory mapped page (anonymous)
	13. KPF_SWAPCACHE	page is in swap cache
	14. KPF_SWAPBACKED	page is swap/RAM backed
	15. KPF_COMPOUND_HEAD	(*)
	16. KPF_COMPOUND_TAIL	(*)
	17. KPF_HUGE		hugeTLB pages
	18. KPF_UNEVICTABLE	page is in the unevictable LRU list
	19. KPF_HWPOISON(TBD)	hardware detected corruption
	20. KPF_NOPAGE		(pseudo flag) no page frame at the address
	32-39.			more obscure flags for kernel developers

	(*) For compound pages, exporting _both_ head/tail info enables
	    users to tell where a compound page starts/ends, and its order.

The accompanying page-types tool will handle the details like decoupling
overloaded flags and hiding obscure flags to normal users.

Thanks to KOSAKI and Andi for their valuable recommendations!

Signed-off-by: Wu Fengguang 
Cc: KOSAKI Motohiro 
Cc: Andi Kleen 
Cc: Matt Mackall 
Cc: Alexey Dobriyan 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: kpagecount/kpageflags code cleanup

2009-06-17T02:47:36+00:00

Move increments of pfn/out to bottom of the loop.

Signed-off-by: Wu Fengguang 
Cc: KOSAKI Motohiro 
Cc: Andi Kleen 
Acked-by: Matt Mackall 
Cc: Alexey Dobriyan 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds