linux-kernel - Re: [PATCH] xfs: do not pass unused params to xfs_flush

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Date:	Tue, 22 Apr 2008 05:56:21 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Eric Sandeen <sandeen@...deen.net>, David Chinner <dgc@....com>,
	Adrian Bunk <bunk@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Shawn Bohrer <shawn.bohrer@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] xfs: do not pass unused params to xfs_flush_pages

On Tue, Apr 22, 2008 at 10:57:33AM +0200, Denys Vlasenko wrote:
> You do not see reduced stack usage in "make checkstack",
> because "make checkstack" shows only stack usage caused by
> local variables (it analyses sub %esp,NN instructions which
> make room for them). Parameters also take up stack, but
> they are pushed on stack with push instruction,
> and so are invisible in "make checkstack" output.

That on i?86 actually depends on whether -maccumulate-outgoing-args
is on or off (the default is off for -Os and most pre-i686 tunings,
and on for i686 and most post-i686 tunings when not -Os).

	Jakub
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