From: Andrew Morton <akpm@linux-foundation.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
hugh@veritas.com, Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [RFC/PATCH] prepare_unmapped_area
Date: Mon, 5 Feb 2007 22:54:18 -0800 [thread overview]
Message-ID: <20070205225418.b0eb0346.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070206064034.GB5549@wotan.suse.de>
On Tue, 6 Feb 2007 07:40:34 +0100 Nick Piggin <npiggin@suse.de> wrote:
> On Mon, Feb 05, 2007 at 10:37:47PM -0800, Andrew Morton wrote:
> > On Tue, 6 Feb 2007 07:12:11 +0100 Nick Piggin <npiggin@suse.de> wrote:
> > >
> > > It still costs a whole nother cacheline, for just an empty function on
> > > !hugepage kernels.
> >
> > Doubtful, especially with CONFIG_CC_OPTIMIZE_FOR_SIZE=y.
>
> Oh, does the function call get stripped out in that case? Why does it
> get left in with OPTIMIZE_FOR_SIZE=n, I wonder?
It's still there, but is probably sharing a cacheline with the callee,
assuming the linker leaves functions in the programmer-specfied order,
which it usually does.
Some of the fancy linker options might subvert that, dunno.
--
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next prev parent reply other threads:[~2007-02-06 6:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200702060405.l1645R7G009668@shell0.pdx.osdl.net>
[not found] ` <1170736938.2620.213.camel@localhost.localdomain>
[not found] ` <20070206044516.GA16647@wotan.suse.de>
2007-02-06 5:04 ` [RFC/PATCH] prepare_unmapped_area Benjamin Herrenschmidt
2007-02-06 5:31 ` Andrew Morton
2007-02-06 5:46 ` Benjamin Herrenschmidt
2007-02-06 5:58 ` Andrew Morton
2007-02-06 6:02 ` Benjamin Herrenschmidt
2007-02-06 6:08 ` Andrew Morton
2007-02-06 6:12 ` Nick Piggin
2007-02-06 6:37 ` Andrew Morton
2007-02-06 6:40 ` Nick Piggin
2007-02-06 6:54 ` Andrew Morton [this message]
2007-02-06 9:55 ` Christoph Hellwig
2007-02-06 10:07 ` Benjamin Herrenschmidt
2007-02-06 10:23 ` Christoph Hellwig
2007-02-06 15:56 ` Adam Litke
2007-02-06 20:12 ` Benjamin Herrenschmidt
2007-02-06 20:52 ` Adam Litke
2007-02-06 21:02 ` Benjamin Herrenschmidt
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