linux-kernel - RE: Memory allocation modifications in ibm

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Message-ID: <5ABE8A5E96C0364CAF2B4DC1DEB7CEAC12822018@Mercury.usurf.usu.edu>
Date:	Thu, 2 Sep 2010 15:54:50 +0000
From:	Jonathan Haws <Jonathan.Haws@....usu.edu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-net@...r.kernel.org" <linux-net@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: Memory allocation modifications in ibm_newemac driver AND sil24
 driver

>> Can anyone explain to me why I would be getting this error in the
>> first place?  Why is it failing to allocate a page when there are
>> pages available?  That does not make any sense to me.

> order:1

> It's failing to allocate -two- pages.

Good point.  However, why is it failing?  According to the dump, there are 28 8k pages available.

From doing more testing yesterday, I found that this error is also coming up from the SATA driver as well (sil24).  Again with those errors, it fails allocating a page of order 0, when there are a few hundred of those available.  What is up with the VMM?  Why are pages failing to allocate when they are available?

Thanks,

Jonathan