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SubjectRe: 2.6.22-rc1-mm1 huge pages VM freeze (maybe?)
On Tue, 31 Jul 2007 15:44:21 -0600 Zan Lynx wrote:

> I was playing with huge pages and libhugetlbfs. Small programs like
> "ls" work fine. I tried running Evolution through libhugetlbfs and the
> system slowly stops running. One interesting thing is the "ps" command,
> it gets stuck like this:

Do you mean 2.6.22-rc1-mm1 or 2.6.23-rc1-mm1?

There was a hugepage problem fixed very recently, in 2.6.23-rc1 IIRC.


> ps D ffff81001e57ed40 0 103558 103483
> ffff81001f061dc8 0000000000000096 ffff81003d8586e8 ffff81001cbadc00
> 0000000000000006 ffffffff80537009 0000000000000030 ffffffff807ff700
> ffffffff807ff700 ffffffff807ff700 ffffffff807ff700 ffffffff807ff700
> Call Trace:
> [<ffffffff80537009>] _spin_unlock+0x29/0x50
> [<ffffffff80536425>] __down_read+0x75/0xaf
> [<ffffffff80295f49>] access_process_vm+0x49/0x190
> [<ffffffff802f3003>] proc_pid_cmdline+0xa3/0x130
> [<ffffffff802f4cea>] proc_info_read+0xba/0x100
> [<ffffffff802b0085>] vfs_read+0xc5/0x180
> [<ffffffff802b0583>] sys_read+0x53/0x90
> [<ffffffff8020c1de>] system_call+0x7e/0x83
>
> and nothing will touch it after that.
>
> Here's my kernel command line:
> root=/dev/sda2 rootfstype=reiser4 rootflags=no_write_barrier ro
> i8042.nomux elevator=cfq resume=/dev/sda3 panic=5 nmi_watchdog=2,panic
> debug hugepages=32
>
> Here's the "huge" script I was using to run programs:
> #!/bin/sh
> export LD_PRELOAD=libhugetlbfs.so
> export HUGETLB_MORECORE=yes
> export HUGETLB_PATH=/mnt/huge
> export HUGETLB_VERBOSE=1
> exec "$@"
>
> I don't have any more info than that at the moment but I could reproduce
> it with whatever, on request.

---
~Randy
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