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Date: Tue, 14 Apr 2009 12:36:11 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andi Kleen <andi@...stfloor.org>,
LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [RFC][PATCH] proc: export more page flags in /proc/kpageflags
On Tue, Apr 14, 2009 at 12:22:31PM +0800, Wu Fengguang wrote:
> Export the following page flags in /proc/kpageflags,
> just in case they will be useful to someone:
>
> - PG_swapcache
> - PG_swapbacked
> - PG_mappedtodisk
> - PG_reserved
> - PG_private
> - PG_private_2
> - PG_owner_priv_1
>
> - PG_head
> - PG_tail
> - PG_compound
>
> - PG_unevictable
> - PG_mlocked
>
> - PG_poison
>
> Also add the following two pseudo page flags:
>
> - PG_MMAP: whether the page is memory mapped
> - PG_NOPAGE: whether the page is present
>
> This increases the total number of exported page flags to 25.
And here are two simple tools utilizing the exported page flags:
# ./page-types
flags page-count MB symbolic-flags long-symbolic-flags
0x000000 472521 1845 _________________________
0x000020 1 0 _____l___________________ lru
0x000028 2516 9 ___U_l___________________ uptodate,lru
0x00002c 5209 20 __RU_l___________________ referenced,uptodate,lru
0x000068 234 0 ___U_lA__________________ uptodate,lru,active
0x00006c 981 3 __RU_lA__________________ referenced,uptodate,lru,active
0x000228 49 0 ___U_l___x_______________ uptodate,lru,reclaim
0x000400 547 2 __________B______________ buddy
0x000804 1 0 __R________m_____________ referenced,mmap
0x000828 1073 4 ___U_l_____m_____________ uptodate,lru,mmap
0x00082c 318 1 __RU_l_____m_____________ referenced,uptodate,lru,mmap
0x000868 235 0 ___U_lA____m_____________ uptodate,lru,active,mmap
0x00086c 822 3 __RU_lA____m_____________ referenced,uptodate,lru,active,mmap
0x000880 1510 5 _______S___m_____________ slab,mmap
0x0008c0 49 0 ______AS___m_____________ active,slab,mmap
0x002078 1 0 ___UDlA______b___________ uptodate,dirty,lru,active,swapbacked
0x00207c 17 0 __RUDlA______b___________ referenced,uptodate,dirty,lru,active,swapbacked
0x002808 10 0 ___U_______m_b___________ uptodate,mmap,swapbacked
0x002868 3296 12 ___U_lA____m_b___________ uptodate,lru,active,mmap,swapbacked
0x00286c 25 0 __RU_lA____m_b___________ referenced,uptodate,lru,active,mmap,swapbacked
0x002878 2 0 ___UDlA____m_b___________ uptodate,dirty,lru,active,mmap,swapbacked
0x008000 19247 75 _______________r_________ reserved
0x080000 15 0 ___________________H_____ head
0x080014 1 0 __R_D______________H_____ referenced,dirty,head
0x080880 915 3 _______S___m_______H_____ slab,mmap,head
0x0808c0 60 0 ______AS___m_______H_____ active,slab,mmap,head
0x100000 4309 16 ____________________T____ tail
0x100014 4 0 __R_D_______________T____ referenced,dirty,tail
total 513968 2007
To show the compound tail pages:
# ./page-areas 0x100000
offset len KB
3089 3 12KB
487441 7 28KB
487449 7 28KB
487457 7 28KB
487465 7 28KB
487473 7 28KB
487481 7 28KB
487489 7 28KB
487497 7 28KB
487505 7 28KB
487513 7 28KB
487521 7 28KB
487529 7 28KB
487537 7 28KB
487545 7 28KB
487553 7 28KB
487561 7 28KB
487569 7 28KB
487577 7 28KB
487585 7 28KB
487593 7 28KB
487617 7 28KB
487627 1 4KB
487629 1 4KB
487633 7 28KB
487641 7 28KB
487649 7 28KB
487657 7 28KB
487665 7 28KB
487673 7 28KB
487681 7 28KB
487689 7 28KB
487697 7 28KB
487705 7 28KB
487713 7 28KB
487721 7 28KB
487729 7 28KB
487737 7 28KB
487745 7 28KB
487753 7 28KB
487761 7 28KB
487769 7 28KB
487777 7 28KB
487785 7 28KB
487793 7 28KB
487801 7 28KB
487809 7 28KB
487817 7 28KB
487825 7 28KB
487853 3 12KB
487865 7 28KB
487873 3 12KB
487893 3 12KB
487897 3 12KB
487901 3 12KB
487905 3 12KB
487909 3 12KB
487929 7 28KB
487937 7 28KB
487945 7 28KB
493569 3 12KB
493573 1 4KB
493575 1 4KB
493585 7 28KB
493593 3 12KB
493597 3 12KB
493601 7 28KB
493609 7 28KB
493617 7 28KB
493625 1 4KB
493633 7 28KB
493641 3 12KB
493645 3 12KB
[snip]
Thanks,
Fengguang
View attachment "page-types.c" of type "text/x-csrc" (1635 bytes)
View attachment "pagemap.h" of type "text/x-chdr" (2824 bytes)
View attachment "Makefile" of type "text/plain" (169 bytes)
View attachment "page-areas.c" of type "text/x-csrc" (1444 bytes)
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