On Fri, Sep 14, 2007 at 20:17:46 +0300, Sami Farin wrote:
> On Wed, Sep 05, 2007 at 18:48:51 -0400, Rik van Riel wrote:
> > Sami Farin wrote:
> >> On Wed, Sep 05, 2007 at 12:24:26 -0400, Rik van Riel wrote:
> >> ...
> *shrug*
> >>> The attached patch should make sure kswapd does not free an
> >>> excessive number of pages in zone_normal just because the
> >>> pages in zone_highmem are difficult to free.
> >>>
> >>> It does give kswapd a large margin to continue putting equal
> >>> pressure on all zones in normal situations.
> >>>
> >>> Sami, could you try out this patch to see if it helps your
> >>> situation?
> >>
> >> Thanks, Rik. bzImage is ready, I probably reboot inside one
> >> month for a reason or other 8-)
> >
> > The more I look at the bug, the more I see that it is probably
> > not very easy to reproduce on demand. I have, however, a full
>
> Well, I now booted to x86_64 kernel.
>
> I can still reproduce this.
> When I unload ipset modules, kernel resumes "normal" operation, i.e.,
> not swapping like mad.
I now have 2GB of extra RAM, so 3GB in total, on x86_64 system.
If ipset tries to allocate 512 KB or more, kernel
goes into swapping frenzy, of which system does not recover
in over 30 minutes unless I press sysrq+k.
some kernel settings...:
vm.dirty_ratio = 4
vm.dirty_background_ratio = 2
vm.swappiness = 10
vm.vfs_cache_pressure = 10
vm.overcommit_memory = 2
SysRq : Show Blocked State
taskPC stack pid father
kswapd0 D 0 258 2
8100be333ca0 0046 0286
8100be333c50 8100be560080 807af3c0
0064 0001285af6e6 00ff 802463f8
Call Trace:
[] __mod_timer+0xb8/0xd0
[] schedule_timeout+0x63/0xd0
[] process_timeout+0x0/0x10
[] io_schedule_timeout+0x28/0x40
[] congestion_wait+0x8c/0xb0
[] autoremove_wake_function+0x0/0x40
[] throttle_vm_writeout+0x54/0xc0
[] shrink_zone+0xe3/0x140
[] kswapd+0x510/0x5b0
[] autoremove_wake_function+0x0/0x40
[] kswapd+0x0/0x5b0
[] kthread+0x4d/0x80
[] child_rip+0xa/0x12
[] kthread+0x0/0x80
[] child_rip+0x0/0x12
irqbalanceD 00aa7f00 0 2110 1
8100b8c4fcd8 0082
8100a5e57f00 00080076 8100be5f91c0 810060182140
8100b8c4fc88 0282 8100b8c4fcb8 8040e1f6
Call Trace:
[] __up_read+0x46/0xb0
[] io_schedule+0x28/0x40
[] sync_page+0x37/0x50
[] __wait_on_bit_lock+0x4e/0x80
[] sync_page+0x0/0x50
[] __lock_page+0x65/0x70
[] wake_bit_function+0x0/0x30
[] handle_mm_fault+0x269/0x870
[] do_page_fault+0x1a4/0x900
[] free_pages_and_swap_cache+0x9e/0xd0
[] unmap_region+0x136/0x150
[] remove_vma+0x5e/0x70
[] __up_write+0xd0/0x130
[] error_exit+0x0/0x84
svscanD 00df7900 0 2438 1
8100b6607cd8 0082
81005f81fd80 00080076 8100bb516180 810060182140
8100b6607c88 0282 8100b6607cb8 8040e1f6
Call Trace:
[] __up_read+0x46/0xb0
[] io_schedule+0x28/0x40
[] sync_page+0x37/0x50
[] __wait_on_bit_lock+0x4e/0x80
[] sync_page+0x0/0x50
[] __lock_page+0x65/0x70
[] wake_bit_function+0x0/0x30
[] handle_mm_fault+0x269/0x870
[] xfs_vn_getattr+0x4c/0x140
[] do_page_fault+0x1a4/0x900
[] vfs_getattr+0x60/0x90
[] vfs_fstat+0x45/0x60
[] sys32_fstat64+0x2e/0x40
[] error_exit+0x0/0x84
...
ipset D 0 3713 3574
8100566237a8 0086 810056623748 802335e2
810056623748 0010 8100b085e0c0 810060182140
810056623758 0282 810056623788 8040e1f6
Call Trace:
[] enqueue_entity+0x42/0x60
[] __up_read+0x46/0xb0
[] io_schedule+0x28/0x40
[] sync_page+0x37/0x50
[] __wait_on_bit+0x55/0x80
[] sync_page+0x0/0x50
[] wait_on_page_bit+0x6f/0x80
[] wake_bit_function+0x0/0x30
[] shrink_page_list+0x164/0x680
[] del_timer_sync+0x1a/0x30
[] schedule_timeout+0x6b/0xd0
[] process_timeout+0x0/0x10
[] congestion_wait+0x9a/0xb0
[] shrink_inactive_list+0x40a/0x420
[] shrink_zone+0xcf/0x140
[] try_to_free_pages+0x174/0x270
[] __alloc_pages+0x160/0x350
[] printk+0x67/0x70
[] cache_alloc_refill+0x2e3/0x570
[] __kmalloc+0x113/0x120
[] :ip_set_nethash:retry+0x183/0x500
[] :ip_set:__ip_set_addip+0x6f/0x90
[] :ip_set:ip_set_sockfn_get+0x93d/0xd50
[] nf_sockopt+0x142/0x150
[] nf_getsockopt+0xf/0x20
[] ip_getsockopt+0x98/0xc0
[] raw_getsockopt+0x11/0x30
[] sock_common_getsockopt+0xf/0x20
[] sys_getsockopt+0x9c/0xd0
[] tracesys+0xdc/0xe1
SysRq : Show Memory
Mem-info:
DMA per-cpu:
CPU0: Hot: hi:0, btch: 1 usd: 0 Cold: hi:0, btch: 1 usd: 0
CPU1: Hot: hi:0, btch: 1 usd: 0 Cold: hi:0, btch: 1 usd: 0
DMA32 per-cpu:
CPU0: Hot: hi: 186, btch: 31 usd: 22 Cold: hi: 62, btch: 15 usd: 55
CPU1: Hot: hi: 186, btch:
