linux-kernel - Re: 2.6.22-rc1-mm1 huge pages VM freeze (maybe?)

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Message-ID: <29495f1d0708022051j471fcdf4q8937364b9647e6ee@mail.gmail.com>
Date:	Thu, 2 Aug 2007 20:51:38 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"Zan Lynx" <zlynx@....org>
Cc:	"Randy Dunlap" <randy.dunlap@...cle.com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22-rc1-mm1 huge pages VM freeze (maybe?)

On 8/1/07, Zan Lynx <zlynx@....org> wrote:
> On Wed, 2007-08-01 at 08:52 -0700, Nish Aravamudan wrote:
> > On 7/31/07, Zan Lynx <zlynx@....org> wrote:
> > > On Tue, 2007-07-31 at 15:02 -0700, Randy Dunlap wrote:
> > > > 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?
> > >
> > > D'oh!  I mean 2.6.23-rc1-mm1, the 22 was a typo.  Cut & paste to be
> > > sure:
> > > Linux zephyr 2.6.23-rc1-mm1 #1 SMP PREEMPT Wed Jul 25 17:33:04 MDT 2007
> > > x86_64 AMD Athlon(tm) 64 Processor 3400+ AuthenticAMD GNU/Linux
> >
> > Just to confirm, still happens with -mm2?
>
> No, it does not seem to.  Evolution runs OK.  ps, top, pmap all work
> fine.

Interesting.

> However, a couple of other things happened.  Could be unrelated or only
> loosely related.
>
> Evolution launches spamd (spamassassin) to filter junk mail.  spamd died
> and I have this in dmesg to show for it:
>
> VM: killing process spamd
>
> spamd would have inherited the libhugetlbfs.so environment variables.
> There are no other clues as to why it died though.

Interesting. Any chance spamd can be run manually with those env
variables, but with HUGETLB_VERBOSE=99 (and/or in gdb) to see what
happens to it?

> Also, immediately after launching evolution with libhugetlbfs, I got
> that USB bug where the mouse starts creating keyboard input.  I got some
> of these in dmesg:
> keyboard.c: can't emulate rawmode for keycode 240
>
> That could be pure coincidence, although I had been using the system
> almost all day before that, and it hadn't happened.

Had you started evolution w/o libhugetlbs at all before that?

It does seem like that would be coincidence.

Thanks,
Nish
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