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SubjectRe: MM patches against 2.5.31
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On Sun, 2002-08-25 at 20:32, Andrew Morton wrote:
> "Martin J. Bligh" wrote:
> >
> > >> > kjournald: page allocation failure. order:0, mode:0x0
> > >>
> > >> I've seen this before, but am curious how we ever passed
> > >> a gfpmask (aka mode) of 0 to __alloc_pages? Can't see anywhere
> > >> that does this?
> > >
> > > Could be anywhere, really. A network interrupt doing GFP_ATOMIC
> > > while kjournald is executing. A radix-tree node allocation
> > > on the add-to-swap path perhaps. (The swapout failure messages
> > > aren't supposed to come out, but mempool_alloc() stomps on the
> > > caller's setting of PF_NOWARN.)
> > >
> > > Or:
> > >
> > > mnm:/usr/src/25> grep -r GFP_ATOMIC drivers/scsi/*.c | wc -l
> > > 89
> >
> > No, GFP_ATOMIC is not 0:
> >
>
> It's mempool_alloc(GFP_NOIO) or such. mempool_alloc() strips
> __GFP_WAIT|__GFP_IO on the first attempt.
>
> It also disables the printk, so maybe I just dunno ;) show_stack()
> would tell.
>

The "kjournald: page allocation failure. order:0, mode:0x0" message and
"pdflush: page allocation failure. order:0, mode:0x0" occurred only once
each on my dual p3 scsi ext3 test box running 2.5.31-mm1. So, I added
something like this:
--- page_alloc.c.orig Thu Aug 22 17:27:32 2002
+++ page_alloc.c Thu Aug 22 17:29:24 2002
@@ -388,6 +388,8 @@
printk("%s: page allocation failure."
" order:%d, mode:0x%x\n",
current->comm, order, gfp_mask);
+ if (gfp_mask == 0)
+ BUG();
}
return NULL;
}
and continued testing on Friday with no repeats of the "page allocation failure"
messages. I obtained a second dual p3 ext3 test box (ide this time) and left both
boxes running 2.5.31-mm1 and the dbench 1..128 stress test scripted to rerun many
times over the weekend. Due to a couple of firewalls, I can't look at those boxes
from here, but I'll let you know what happened in about 10 to 11 hours.

Cheers,
Steven

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