linux-kernel - Re: Commit 34d76c41 causes linker errors on ia64 with NR

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Message-ID: <4ADD62CD.3080208@kernel.org>
Date:	Tue, 20 Oct 2009 16:12:13 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jiri Kosina <jkosina@...e.cz>, Jeff Mahoney <jeffm@...e.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org
Subject: Re: Commit 34d76c41 causes linker errors on ia64 with NR_CPUS=4096

Hello,

Ingo Molnar wrote:
> Still looks like a bug if it causes a breakage (linker error) on IA64, 

In a sense, yes.

> and if the 'fix' (i'd call it a workaround) causes a (small but nonzero) 
> performance regression on other architectures.

Yeah, by small amount but also reduces memory usage quite a bit.  For
this case, I think dynamic allocation is actually the right thing to
do.

Extending the first chunk size shouldn't be difficult on ia64 but
other than this, there still is a lot of room left with the current
64k limit, so I think we should be safe for a while.  BTW, I also am
curious how lockdep has been coping with the limit.

Thanks.

-- 
tejun
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