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

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Message-ID: <4ADD62AA.8060503@gmail.com>
Date:	Tue, 20 Oct 2009 09:11:38 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
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

Ingo Molnar a écrit :
 
> Still looks like a bug if it causes a breakage (linker error) on IA64, 
> and if the 'fix' (i'd call it a workaround) causes a (small but nonzero) 
> performance regression on other architectures.
> 

True, but this also save some amount of ram for some distro kernels.

If we keep this static NR_CPUS thing, we might be able to free
the end of table, for other per_cpu users ?

if (nr_cpus_ids < NR_CPUS) {
	per_cpu_free_static_zone(&update_shares_data[nr_cpus_ids],
				 sizeof(long)*(NR_CPUS - nr_cpus_ids));
}


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