linux-kernel - Re: Large stack usage in fs code (especially for PPC64)

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Message-ID: <18722.43694.861169.946743@cargo.ozlabs.ibm.com>
Date:	Tue, 18 Nov 2008 22:44:46 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Large stack usage in fs code (especially for PPC64)

Nick Piggin writes:

> It's much harder to do this with powerpc I think because they would need
> to calculate 8 hashes and touch 8 cachelines to prefill 8 translations,
> wouldn't they?

Yeah, the hashed page table sucks.  Film at 11, as they say. :)

Paul.
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