linux-kernel - Re: [PATCH 1/4] mm: introduce compaction and migration for virtio ballooned pages

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Date:	Tue, 26 Jun 2012 22:34:00 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Rafael Aquini <aquini@...hat.com>, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/4] mm: introduce compaction and migration for virtio ballooned pages

> How is the compiler meant to optimise away "cond" if it's a function
> call?

Inlines can be optimized away.  These tests are usually inlines.

> What did I miss? If nothing, then I will revert this particular change
> and Rafael will need to be sure his patch is not using VM_BUG_ON to call
> a function with side-effects.

Do you have an example where the code is actually different,
or are you just speculating?

FWIW for my config both generates the same code:

size vmlinux-andi-vmbug vmlinux-vmbug-nothing 
   text    data     bss     dec     hex filename
11809704        1457352 1159168 14426224         dc2070 vmlinux-andi-vmbug
11809704        1457352 1159168 14426224         dc2070 vmlinux-vmbug-nothing

-Andi
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