From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andrea Righi <righi.andrea@gmail.com>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] mm: unify pmd_free() implementation
Date: Mon, 28 Jul 2008 08:53:46 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.10.0807280851130.3486@nehalem.linux-foundation.org> (raw)
In-Reply-To: <1217260287-13115-1-git-send-email-righi.andrea@gmail.com>
On Mon, 28 Jul 2008, Andrea Righi wrote:
>
> Move multiple definitions of pmd_free() from different include/asm-* into
> mm/util.c.
But this is horrible, because it forces a totally unnecessary function
call for that empty function.
Yeah, the function will be cheap, but the call itself will not be (it's a
C language barrier and basically disables optimizations around it, causing
thigns like register spill/reload for no good reason).
Linus
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next prev parent reply other threads:[~2008-07-28 15:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-28 15:51 Andrea Righi
2008-07-28 15:53 ` Linus Torvalds [this message]
2008-07-28 16:17 ` Andrea Righi
2008-07-28 16:27 ` KOSAKI Motohiro
2008-07-28 17:19 ` Andrea Righi
2008-07-28 20:30 ` Andrew Morton
2008-07-28 20:46 ` Jeremy Fitzhardinge
2008-07-28 22:53 ` [PATCH 1/1] mm: unify pmd_free() and __pmd_free_tlb() implementation Andrea Righi
2008-07-31 16:17 ` Ingo Molnar
2008-07-31 16:59 ` Andrea Righi
2008-07-28 16:17 ` [PATCH 1/1] mm: unify pmd_free() implementation James Bottomley
2008-07-28 16:45 ` Linus Torvalds
2008-07-28 16:58 ` James Bottomley
2008-07-28 17:10 ` Linus Torvalds
2008-07-28 20:08 ` [PATCH 1/1] mm: unify pmd_free() implementation -> instrumentation Mathieu Desnoyers
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