linux-kernel - Should we be using unlikely() around tests of GFP

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Message-Id: <E1PZXeb-0004AV-2b@tytso-glaptop>
Date:	Sun, 02 Jan 2011 18:48:01 -0500
From:	"Theodore Ts'o" <tytso@....edu>
To:	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org
cc:	linux-kernel@...r.kernel.org
Subject: Should we be using unlikely() around tests of GFP_ZERO?


Given the patches being busily submitted by trivial patch submitters to
make use kmem_cache_zalloc(), et. al, I believe we should remove the
unlikely() tests around the (gfp_flags & __GFP_ZERO) tests, such as:

-	if (unlikely((flags & __GFP_ZERO) && objp))
+	if ((flags & __GFP_ZERO) && objp)
		memset(objp, 0, obj_size(cachep));

Agreed?  If so, I'll send a patch...

	    					- Ted
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