* migrate_pages() failure
@ 2007-10-26 20:57 Badari Pulavarty
2007-10-26 23:07 ` Badari Pulavarty
0 siblings, 1 reply; 4+ messages in thread
From: Badari Pulavarty @ 2007-10-26 20:57 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki, melgor; +Cc: linux-mm
Hi,
While playing with hotplug memory remove on x86-64 and ppc64, I noticed
that some of the memory sections can not be offlined. What I noticed is
migrate_pages() fails to move the pages. I added debug and page_owner
to track these pages. I am wondering why they couldn't be migrated ?
Ideas ?
BTW, I did echo 3 > /proc/sys/vm/drop_caches to drop all the
caches before trying to offline (on this cleanly rebooted machine).
nr_failed 0 retry 116
migrate pages failed 3f025/3/3f00000000800
migrate pages failed 3f048/3/3f00000000800
migrate pages failed 3f04c/3/3f00000000800
migrate pages failed 3f06e/3/3f00000000800
migrate pages failed 3f092/3/3f00000000800
migrate pages failed 3f093/3/3f00000000800
migrate pages failed 3f097/3/3f00000000800
migrate pages failed 3f0b2/3/3f00000000800
migrate pages failed 3f0b7/3/3f00000000800
migrate pages failed 3f0b8/3/3f00000000800
migrate pages failed 3f100/3/3f00000000800
migrate pages failed 3f196/3/3f00000000800
migrate pages failed 3f19d/3/3f00000000800
migrate pages failed 3f1b7/3/3f00000000800
migrate pages failed 3f1ba/3/3f00000000800
migrate pages failed 3f1c8/3/3f00000000800
Page owner shows:
Page allocated via order 0, mask 0x120050
PFN 258085 Block 63 type 2 Flags L
[0xc0000000000bae88] .alloc_pages_current+180
[0xc0000000000f995c] .__find_get_block_slow+88
[0xc000000000093534] .__page_cache_alloc+24
[0xc0000000000f9ed0] .__find_get_block+272
[0xc000000000094598] .find_or_create_page+76
[0xc0000000000fb288] .unlock_buffer+48
[0xc0000000000fa178] .__getblk+312
[0xc0000000000fbb84] .ll_rw_block+348
Page allocated via order 0, mask 0x120050
PFN 258120 Block 63 type 2 Flags L
[0xc0000000000bae88] .alloc_pages_current+180
[0xc0000000000f995c] .__find_get_block_slow+88
[0xc0000000004ce49c] .__wait_on_bit+232
[0xc000000000093534] .__page_cache_alloc+24
[0xc0000000000f9ed0] .__find_get_block+272
[0xc000000000094598] .find_or_create_page+76
[0xc0000000000fa014] .__find_get_block+596
[0xc0000000000fb288] .unlock_buffer+48
Page allocated via order 0, mask 0x120050
PFN 258124 Block 63 type 2 Flags L
[0xc0000000000bae88] .alloc_pages_current+180
[0xc0000000000f995c] .__find_get_block_slow+88
[0xc0000000004ce49c] .__wait_on_bit+232
[0xc000000000093534] .__page_cache_alloc+24
[0xc0000000000f9ed0] .__find_get_block+272
[0xc000000000094598] .find_or_create_page+76
[0xc0000000000fb288] .unlock_buffer+48
[0xc0000000000fa178] .__getblk+312
Page allocated via order 0, mask 0x120050
PFN 258158 Block 63 type 2 Flags L
[0xc0000000000bae88] .alloc_pages_current+180
[0xc0000000000f995c] .__find_get_block_slow+88
[0xc0000000004ce49c] .__wait_on_bit+232
[0xc000000000093534] .__page_cache_alloc+24
[0xc0000000000f9ed0] .__find_get_block+272
[0xc000000000094598] .find_or_create_page+76
[0xc0000000000fa014] .__find_get_block+596
[0xc0000000000fb288] .unlock_buffer+48
Thanks,
Badari
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: migrate_pages() failure
2007-10-26 20:57 migrate_pages() failure Badari Pulavarty
@ 2007-10-26 23:07 ` Badari Pulavarty
2007-10-26 23:51 ` KAMEZAWA Hiroyuki
0 siblings, 1 reply; 4+ messages in thread
From: Badari Pulavarty @ 2007-10-26 23:07 UTC (permalink / raw)
To: KAMEZAWA Hiroyuki; +Cc: melgor, linux-mm
On Fri, 2007-10-26 at 13:57 -0700, Badari Pulavarty wrote:
> Hi,
>
> While playing with hotplug memory remove on x86-64 and ppc64, I noticed
> that some of the memory sections can not be offlined. What I noticed is
> migrate_pages() fails to move the pages. I added debug and page_owner
> to track these pages. I am wondering why they couldn't be migrated ?
> Ideas ?
>
> BTW, I did echo 3 > /proc/sys/vm/drop_caches to drop all the
> caches before trying to offline (on this cleanly rebooted machine).
>
> nr_failed 0 retry 116
> migrate pages failed 3f025/3/3f00000000800
> migrate pages failed 3f048/3/3f00000000800
> migrate pages failed 3f04c/3/3f00000000800
> migrate pages failed 3f06e/3/3f00000000800
> migrate pages failed 3f092/3/3f00000000800
> migrate pages failed 3f093/3/3f00000000800
> migrate pages failed 3f097/3/3f00000000800
> migrate pages failed 3f0b2/3/3f00000000800
> migrate pages failed 3f0b7/3/3f00000000800
> migrate pages failed 3f0b8/3/3f00000000800
> migrate pages failed 3f100/3/3f00000000800
> migrate pages failed 3f196/3/3f00000000800
> migrate pages failed 3f19d/3/3f00000000800
> migrate pages failed 3f1b7/3/3f00000000800
> migrate pages failed 3f1ba/3/3f00000000800
> migrate pages failed 3f1c8/3/3f00000000800
>
Digged up little more ..
All these pages are "reiserfs" backed file and reiserfs doesn't
have migratepage() handler. reiserfs_releasepage() gives up
since one of the buffer_head attached to the page is dirty or locked :(
Nothing much migrate pages could do :(
Thanks,
Badari
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: migrate_pages() failure
2007-10-26 23:07 ` Badari Pulavarty
@ 2007-10-26 23:51 ` KAMEZAWA Hiroyuki
2007-10-29 20:44 ` Christoph Lameter
0 siblings, 1 reply; 4+ messages in thread
From: KAMEZAWA Hiroyuki @ 2007-10-26 23:51 UTC (permalink / raw)
To: Badari Pulavarty; +Cc: melgor, linux-mm
On Fri, 26 Oct 2007 16:07:47 -0700
Badari Pulavarty <pbadari@gmail.com> wrote:
> Digged up little more ..
>
> All these pages are "reiserfs" backed file and reiserfs doesn't
> have migratepage() handler. reiserfs_releasepage() gives up
> since one of the buffer_head attached to the page is dirty or locked :(
>
> Nothing much migrate pages could do :(
>
Hmm, thank you for reporting.
I've never used reiserfs....:(
-Kame
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2007-10-26 20:57 migrate_pages() failure Badari Pulavarty
2007-10-26 23:07 ` Badari Pulavarty
2007-10-26 23:51 ` KAMEZAWA Hiroyuki
2007-10-29 20:44 ` Christoph Lameter
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