linux-kernel - Re: mmotm 2010-10-20-15-01 uploaded

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Message-ID: <1287654869.3488.96.camel@twins>
Date:	Thu, 21 Oct 2010 11:54:29 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Li Zefan <lizf@...fujitsu.com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: mmotm 2010-10-20-15-01 uploaded

On Thu, 2010-10-21 at 00:30 -0700, Andrew Morton wrote:
> btw, it's a bit sad to use KM_TYPE_NR*NR_CPUS pages of virtual address
> space for kmap_atomic().  I'd expect that distros set NR_CPUS quite
> large (Fedora has 256).  That's 20MB of virtual address space consumed,
> I think.
> 
> And we consume it on non-highmem kernels, too... 

I guess its something to look at, luckily i386 kernels tend to have
small NR_CPUS and x86_64 kernels have gobs of vaddr space so its not
really a problem, but yeah would be nice to fix.



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