From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-f178.google.com (mail-lb0-f178.google.com [209.85.217.178]) by kanga.kvack.org (Postfix) with ESMTP id 0B2666B0031 for ; Tue, 11 Feb 2014 12:07:28 -0500 (EST) Received: by mail-lb0-f178.google.com with SMTP id u14so6089569lbd.37 for ; Tue, 11 Feb 2014 09:07:28 -0800 (PST) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id kj3si10397586lbc.39.2014.02.11.09.07.26 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 11 Feb 2014 09:07:27 -0800 (PST) Date: Tue, 11 Feb 2014 17:07:24 +0000 From: Mel Gorman Subject: Re: [PATCH 3/3] mm: Use ptep/pmdp_set_numa for updating _PAGE_NUMA bit Message-ID: <20140211170724.GM6732@suse.de> References: <1392114895-14997-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1392114895-14997-4-git-send-email-aneesh.kumar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <1392114895-14997-4-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Aneesh Kumar K.V" Cc: benh@kernel.crashing.org, paulus@samba.org, riel@redhat.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org On Tue, Feb 11, 2014 at 04:04:55PM +0530, Aneesh Kumar K.V wrote: > From: "Aneesh Kumar K.V" > > Archs like ppc64 doesn't do tlb flush in set_pte/pmd functions. ppc64 also doesn't implement > flush_tlb_range. ppc64 require the tlb flushing to be batched within ptl locks. The reason > to do that is to ensure that the hash page table is in sync with linux page table. > We track the hpte index in linux pte and if we clear them without flushing hash and drop the > ptl lock, we can have another cpu update the pte and can end up with double hash. We also want > to keep set_pte_at simpler by not requiring them to do hash flush for performance reason. > Hence cannot use them while updating _PAGE_NUMA bit. Add new functions for marking pte/pmd numa > > Signed-off-by: Aneesh Kumar K.V Acked-by: Mel Gorman -- Mel Gorman SUSE Labs -- 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