From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Ravikiran G Thirumalai <kiran@scalex86.org>,
Frederik Deweerdt <frederik.deweerdt@xprog.eu>,
andi@firstfloor.org, tglx@linutronix.de, hpa@zytor.com,
linux-kernel@vger.kernel.org
Subject: Re: [patch] tlb flush_data: replace per_cpu with an array
Date: Wed, 14 Jan 2009 10:08:11 +0100 [thread overview]
Message-ID: <20090114090811.GQ23848@one.firstfloor.org> (raw)
In-Reply-To: <1231848016.442.112.camel@twins>
> > It also would save some memory
> > on most distros out there (Ubuntu x86_64 has NR_CPUS=64 by default).
As pointed out several times this claim in the changelog is incorrect.
Please fix it.
A correct description would be:
- This patch wastes memory of one configured cache line for each CPU
on systems with less than 8 cores (e.g. 896 bytes on a 1 core system
with CONFIG_GENERIC_CPU/ cache line size 128)
It saves some memory on systems with more than 8 cores (one cache
line size for each core above 8)
-Andi
next prev parent reply other threads:[~2009-01-14 8:53 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 21:35 [patch] tlb flush_data: replace per_cpu with an array Frederik Deweerdt
2009-01-12 21:46 ` Ingo Molnar
2009-01-12 21:57 ` Andi Kleen
2009-01-12 22:10 ` Frederik Deweerdt
2009-01-12 22:32 ` Andi Kleen
2009-01-12 22:50 ` Ingo Molnar
2009-01-12 22:40 ` Ingo Molnar
2009-01-12 22:59 ` H. Peter Anvin
2009-01-13 2:43 ` Andi Kleen
2009-01-13 12:28 ` Ingo Molnar
2009-01-12 22:34 ` Ravikiran G Thirumalai
2009-01-12 23:00 ` Ingo Molnar
2009-01-12 23:09 ` Ingo Molnar
2009-01-13 2:14 ` Ravikiran G Thirumalai
2009-01-13 12:00 ` Peter Zijlstra
2009-01-13 12:33 ` Ingo Molnar
2009-01-13 18:13 ` Ravikiran G Thirumalai
2009-01-13 18:34 ` Ingo Molnar
2009-01-13 18:42 ` Ravikiran G Thirumalai
2009-01-14 7:31 ` Ingo Molnar
2009-01-15 7:15 ` Ravikiran G Thirumalai
2009-01-14 9:08 ` Andi Kleen [this message]
2009-01-14 14:41 ` Frederik Deweerdt
2009-01-14 15:20 ` Andi Kleen
2009-01-14 15:10 ` Frederik Deweerdt
2009-01-12 22:54 ` Mike Travis
2009-01-12 23:51 ` Frederik Deweerdt
2009-01-12 23:57 ` Mike Travis
2009-01-13 0:01 ` Ingo Molnar
2009-01-13 3:36 ` Andi Kleen
2009-01-13 12:14 ` Ingo Molnar
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