From: Nick Piggin <npiggin@suse.de>
To: Andrea Arcangeli <andrea@qumranet.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-arch@vger.kernel.org, steiner@sgi.com,
cl@linux-foundation.org
Subject: Re: MMU notifiers review and some proposals
Date: Sat, 26 Jul 2008 15:04:06 +0200 [thread overview]
Message-ID: <20080726130406.GA21820@wotan.suse.de> (raw)
In-Reply-To: <20080726113813.GD21150@duo.random>
On Sat, Jul 26, 2008 at 01:38:13PM +0200, Andrea Arcangeli wrote:
>
> 1) absolute minimal intrusion into the kernel common code, and
> absolute minimum number of branches added to the kernel fast
> paths. Kernel is faster than your "minimal" type of notifiers when
> they're disarmed.
BTW. is this really significant? Having one branch per pte
I don't think is necessarily slower than 2 branches per unmap.
The 2 branches will use more icache and more branch history. One
branch even once per pte in the unmapping loop is going to remain
hot in icache and branch history isn't it?
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next prev parent reply other threads:[~2008-07-26 13:04 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 14:39 Nick Piggin
2008-07-25 21:45 ` Andrea Arcangeli
2008-07-26 3:08 ` Nick Piggin
2008-07-26 11:38 ` Andrea Arcangeli
2008-07-26 12:28 ` Nick Piggin
2008-07-26 13:02 ` Andrea Arcangeli
2008-07-26 13:10 ` Nick Piggin
2008-07-26 13:35 ` Andrea Arcangeli
2008-07-27 12:25 ` Nick Piggin
2008-07-26 13:14 ` Nick Piggin
2008-07-26 13:49 ` Andrea Arcangeli
2008-07-27 12:32 ` Nick Piggin
2008-07-30 14:19 ` Christoph Lameter
2008-07-30 14:54 ` Andrea Arcangeli
2008-07-30 15:42 ` Christoph Lameter
2008-07-31 6:14 ` Nick Piggin
2008-07-31 14:19 ` Christoph Lameter
2008-07-26 12:33 ` Nick Piggin
2008-07-26 13:04 ` Nick Piggin [this message]
2008-07-26 13:16 ` Andrea Arcangeli
2008-07-27 12:08 ` Nick Piggin
2008-07-25 23:29 ` Jack Steiner
2008-07-26 3:18 ` Nick Piggin
2008-07-27 9:45 ` Andrew Morton
2008-07-27 12:38 ` Nick Piggin
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