From: Andrew Morton <akpm@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: mmarek@suse.cz, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
hubicka@ucw.cz
Subject: Re: [PATCH] lto: Add __noreorder and mark initcalls __noreorder
Date: Fri, 10 Apr 2015 14:36:29 -0700 [thread overview]
Message-ID: <20150410143629.aaba355c08d3b71e5c1cddd0@linux-foundation.org> (raw)
In-Reply-To: <20150408235023.GT2366@two.firstfloor.org>
On Thu, 9 Apr 2015 01:50:23 +0200 Andi Kleen <andi@firstfloor.org> wrote:
> > Head is spinning a bit. As this all appears to be shiny new
> > added-by-andi gcc functionality, it would be useful if we could have a
> > few more words describing what it's all about. Reordering of what with
> > respect to what and why and why is it bad. Why is gcc reordering
> > things anyway, and what's the downside of preventing this. Why is the
> > compiler reordering things rather than the linker. etc etc etc.
>
> Ok, let me try.
That was super-useful, thanks. I slurped it into the changelog -
maybe one day it will provide material for Documentation/lto-stuff.txt.
Big picture: do you have a feeling for how much benefit LTO will yield
in the kernel, if/when it's all completed?
next prev parent reply other threads:[~2015-04-10 21:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-08 13:17 Andi Kleen
2015-04-08 22:31 ` Andrew Morton
2015-04-08 23:50 ` Andi Kleen
2015-04-10 21:36 ` Andrew Morton [this message]
2015-04-10 23:02 ` Andi Kleen
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