linux-kernel - Re: [RFC GIT PULL] softirq: Consolidation and stack overrun fix

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Message-ID: <20130924080436.GH9326@twins.programming.kicks-ass.net>
Date:	Tue, 24 Sep 2013 10:04:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@....ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	James Hogan <james.hogan@...tec.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Anton Blanchard <anton@....ibm.com>
Subject: Re: [RFC GIT PULL] softirq: Consolidation and stack overrun fix

On Tue, Sep 24, 2013 at 11:52:07AM +1000, Benjamin Herrenschmidt wrote:
> So if that holds, we have a solid way to do per-cpu. On one side, I tend
> to think that r13 being task/thread/thread_info is probably a better
> overall choice, I'm worried that going in a different direction than x86
> means generic code will get "tuned" to use per-cpu for performance
> critical stuff rather than task/thread/thread_info in inflexible ways.

The plus side of per-cpu over per-task is that one typically has a lot
less cpus than tasks. Also, its far easier/cheaper to iterate cpus than
it is to iterate tasks.
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