From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATH V2 4/6] arm: mm: Enable RCU fast_gup Date: Wed, 27 Aug 2014 12:51:37 +0100 Message-ID: <20140827115137.GK6968@arm.com> References: <1408635812-31584-1-git-send-email-steve.capper@linaro.org> <1408635812-31584-5-git-send-email-steve.capper@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1408635812-31584-5-git-send-email-steve.capper@linaro.org> Sender: owner-linux-mm@kvack.org To: Steve Capper Cc: "linux-arm-kernel@lists.infradead.org" , "linux@arm.linux.org.uk" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , Will Deacon , "gary.robertson@linaro.org" , "christoffer.dall@linaro.org" , "peterz@infradead.org" , "anders.roxell@linaro.org" , "akpm@linux-foundation.org" , "dann.frazier@canonical.com" , Mark Rutland , "mgorman@suse.de" List-Id: linux-arch.vger.kernel.org On Thu, Aug 21, 2014 at 04:43:30PM +0100, Steve Capper wrote: > Activate the RCU fast_gup for ARM. We also need to force THP splits to > broadcast an IPI s.t. we block in the fast_gup page walker. As THP > splits are comparatively rare, this should not lead to a noticeable > performance degradation. > > Some pre-requisite functions pud_write and pud_page are also added. > > Signed-off-by: Steve Capper Reviewed-by: Catalin Marinas -- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from fw-tnat.austin.arm.com ([217.140.110.23]:58932 "EHLO collaborate-mta1.arm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932079AbaH0LwX (ORCPT ); Wed, 27 Aug 2014 07:52:23 -0400 Date: Wed, 27 Aug 2014 12:51:37 +0100 From: Catalin Marinas Subject: Re: [PATH V2 4/6] arm: mm: Enable RCU fast_gup Message-ID: <20140827115137.GK6968@arm.com> References: <1408635812-31584-1-git-send-email-steve.capper@linaro.org> <1408635812-31584-5-git-send-email-steve.capper@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1408635812-31584-5-git-send-email-steve.capper@linaro.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Steve Capper Cc: "linux-arm-kernel@lists.infradead.org" , "linux@arm.linux.org.uk" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , Will Deacon , "gary.robertson@linaro.org" , "christoffer.dall@linaro.org" , "peterz@infradead.org" , "anders.roxell@linaro.org" , "akpm@linux-foundation.org" , "dann.frazier@canonical.com" , Mark Rutland , "mgorman@suse.de" Message-ID: <20140827115137.yag_5PhSLXidgFTfc_mpmudy6dYVdjYSBxLISU7I-nc@z> On Thu, Aug 21, 2014 at 04:43:30PM +0100, Steve Capper wrote: > Activate the RCU fast_gup for ARM. We also need to force THP splits to > broadcast an IPI s.t. we block in the fast_gup page walker. As THP > splits are comparatively rare, this should not lead to a noticeable > performance degradation. > > Some pre-requisite functions pud_write and pud_page are also added. > > Signed-off-by: Steve Capper Reviewed-by: Catalin Marinas