From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id 60C576B00FE for ; Sat, 30 May 2009 19:12:21 -0400 (EDT) Date: Sun, 31 May 2009 00:13:18 +0100 From: Alan Cox Subject: Re: [patch 0/5] Support for sanitization flag in low-level page allocator Message-ID: <20090531001318.093e3665@lxorguk.ukuu.org.uk> In-Reply-To: <20090530213311.GM6535@oblivion.subreption.com> References: <20090530075033.GL29711@oblivion.subreption.com> <4A20E601.9070405@cs.helsinki.fi> <20090530082048.GM29711@oblivion.subreption.com> <20090530173428.GA20013@elte.hu> <20090530180333.GH6535@oblivion.subreption.com> <20090530182113.GA25237@elte.hu> <20090530184534.GJ6535@oblivion.subreption.com> <20090530190828.GA31199@elte.hu> <4A21999E.5050606@redhat.com> <84144f020905301353y2f8c232na4c5f9dfb740eec4@mail.gmail.com> <20090530213311.GM6535@oblivion.subreption.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: "Larry H." Cc: Pekka Enberg , Rik van Riel , Ingo Molnar , linux-kernel@vger.kernel.org, Linus Torvalds , linux-mm@kvack.org, Ingo Molnar , pageexec@freemail.hu, Linus Torvalds List-ID: > I was pointing out that the 'those test and jump/call branches have > performance hits' argument, while nonsensical, applies to kzfree and > with even more negative connotations (deeper call depth, more test > branches used in ksize and kfree, lack of pointer validation). But they only apply to kzfree - there isn't a cost to anyone else. You've move the decision to compile time which for the fast path stuff when you just want to clear keys and other oddments is a big win. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org