Messages in this thread | | | Date | Sun, 25 Apr 2004 10:18:45 +0200 | From | Bastian Blank <> | Subject | Re: page allocation failures with 2.6.5 on s390 |
| |
On Sat, Apr 24, 2004 at 01:21:59PM -0700, Andrew Morton wrote: > Bastian Blank <bastian@waldi.eu.org> wrote: > > Today I see the following error message in the logs of two machines > > with 2.6.5 on s390, both 31 and 64 bit. > This is pretty much unavoidable - the kernel is looking for four > physically-contiguous free pages at interrupt time, and there aren't any. > You can reduce its frequency by increasing /proc/sys/vm/min_free_kbytes. > The best fix would be to alter the driver to use order-0 pages if that's > possible.
The pages are 4KiB large, so it allocates 16KiB at once. So the problem is rather clear: | 3: eth0: <BROADCAST,MULTICAST,UP> mtu 8192 qdisc pfifo_fast qlen 100
> > It causes a lot of state-D processes on one machine. > This should not happen. If it happens again, try to capture an all-task > backtrace into the logs with > echo t > /proc/sysrq-trigger
I'm currently not sure if this was the problem causing D process. I reread the logs and found the following: | Unable to handle kernel pointer dereference at virtual kernel address 0000000000000000 | Oops: 0004 [#1] | CPU: 0 Not tainted | Process pdflush (pid: 33, task: 000000000fa58e90, ksp: 000000000fa53b98) | Krnl PSW : 0700200180000000 00000000001022b0 (nfs3_request_init+0x34/0x50) | Krnl GPRS: 0000000000000000 0000000000000001 0000000000000000 0000000000000028 | 0000000000000001 0000000000000000 0000000000001000 000000000672f548 | 0000000000403620 000000000dceb600 0000000000000000 0000000000823020 | 00000000061bfd00 000000000029afb8 00000000001022a0 000000000fa53178 | Krnl Code: ba 54 30 00 a7 44 ff fc e3 20 c0 30 00 24 e3 40 f1 10 00 04 | Call Trace: | [nfs_create_request+216/312] nfs_create_request+0xd8/0x138 | [nfs_update_request+678/1236] nfs_update_request+0x2a6/0x4d4 | [nfs_writepage_async+44/264] nfs_writepage_async+0x2c/0x108 | [nfs_writepage+466/476] nfs_writepage+0x1d2/0x1dc | [mpage_writepages+796/1084] mpage_writepages+0x31c/0x43c | [nfs_writepages+56/196] nfs_writepages+0x38/0xc4 | [do_writepages+46/76] do_writepages+0x2e/0x4c | [__sync_single_inode+200/744] __sync_single_inode+0xc8/0x2e8 | [__writeback_single_inode+246/260] __writeback_single_inode+0xf6/0x104 | [sync_sb_inodes+472/792] sync_sb_inodes+0x1d8/0x318 | [writeback_inodes+144/248] writeback_inodes+0x90/0xf8 | [wb_kupdate+182/324] wb_kupdate+0xb6/0x144 | [__pdflush+430/700] __pdflush+0x1ae/0x2bc | [pdflush+46/60] pdflush+0x2e/0x3c | [kthread+228/236] kthread+0xe4/0xec | [kernel_thread_starter+20/28] kernel_thread_starter+0x14/0x1c
Bastian
-- Insults are effective only where emotion is present. -- Spock, "Who Mourns for Adonais?" stardate 3468.1 [unhandled content-type:application/pgp-signature] | |