From: David Miller <davem@davemloft.net>
To: tj@kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: sparc64 pcpu failures...
Date: Fri, 18 Sep 2009 10:30:25 -0700 (PDT) [thread overview]
Message-ID: <20090918.103025.100709991.davem@davemloft.net> (raw)
In-Reply-To: <4AB34722.7050105@kernel.org>
From: Tejun Heo <tj@kernel.org>
Date: Fri, 18 Sep 2009 17:38:58 +0900
> Yes, this would be the result of the new congruent sparse allocator.
> Heh... I didn't really expect that WARN_ON() to actually trigger.
> What it means is that the farthest percpu units were too far to fit
> into vmalloc area so percpu chunks couldn't be allocated in the
> vmalloc area. Checking... vmalloc area on sparc64 is only 4G so yeap
> that is entirely possible.
>
> Hmmm... the congruent sparse allocator assumes vmalloc area to be
> larger with some margin than the farthest physical memory nodes. On
> x86, powerpc and ia64, this holds with sufficient margin. Would it be
> possible to modify sparc64 memory layout so that the assumption can be
> satisfied? If that's not possible, going back to lpage is an option
> but in many ways congruent sparse allocator is better.
I'll think about this, thanks.
prev parent reply other threads:[~2009-09-18 17:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-18 5:18 David Miller
2009-09-18 5:37 ` David Miller
2009-09-18 8:38 ` Tejun Heo
2009-09-18 17:30 ` David Miller [this message]
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