linux-kernel - Re: [PATCH 3/3] Quick vmalloc vs kmalloc fix to the case where array size is too large

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Date:	Tue, 14 Jul 2009 10:50:02 -0700
From:	Paul Menage <menage@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Benjamin Blum <bblum@...gle.com>
Subject: Re: [PATCH 3/3] Quick vmalloc vs kmalloc fix to the case where array 
	size is too large

On Tue, Jul 14, 2009 at 10:47 AM, Dave Hansen<dave@...ux.vnet.ibm.com> wrote:
>
> How big were those allocations that were failing?  The code made it
> appear that order-2 (PAGE_SIZE*4) allocations were failing.  That's a
> bit lower than I'd expect the page allocator to start failing.

I think it depends on how much fragmentation you've got.

We've seen it fail for cpusets with (I guess) hundreds or thousands of threads.

Paul
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