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Mon, 13 Jun 2022 11:05:19 +0000 (UTC) X-FDA: 79572931158.23.743A020 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf26.hostedemail.com (Postfix) with ESMTP id 5116C14008A for ; Mon, 13 Jun 2022 11:05:19 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 63F02614CB; Mon, 13 Jun 2022 11:05:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CA26C34114; Mon, 13 Jun 2022 11:05:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1655118317; bh=k9aUUnqcx7zhYyOXA4iphpmzLpkcUokEnBIJoGzV800=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=uzP0GwrIIUvxLbEj5B1z2I4q/fkYHdxOBYFqKYQZL8zqRBMOlOnZT43ZKJHsrLuXl cipSxarShAqtSB1sU1Ser/ZNFiFrtEoyHVL+HdztzjouFS1UltSOAA8sBjH6sMKosd TW3yGWDTPLWUkj+q5vWjWBpZ+HP4UAkajg/fjdtCpIAKMC9Rfgh9UOxYexBSe5SYz4 2YSzkZux8MxlhXu6DZPUnA1ullgrB9VKbi0+GAlywJ5U4uVJp0vd4cjZM1mtGqrWbO 5knf8XGOYAsnLGi0PFadaEKXm3/iYrzaJ3Ngk8A1H3Gb0KPbIChGibpNWN6JHkZJl6 tfL55Kv0OB6ew== Date: Mon, 13 Jun 2022 14:05:04 +0300 From: Mike Rapoport To: Wupeng Ma Cc: corbet@lwn.net, will@kernel.org, ardb@kernel.org, catalin.marinas@arm.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, dvhart@infradead.org, andy@infradead.org, akpm@linux-foundation.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, paulmck@kernel.org, keescook@chromium.org, songmuchun@bytedance.com, rdunlap@infradead.org, damien.lemoal@opensource.wdc.com, swboyd@chromium.org, wei.liu@kernel.org, robin.murphy@arm.com, david@redhat.com, anshuman.khandual@arm.com, thunder.leizhen@huawei.com, wangkefeng.wang@huawei.com, gpiccoli@igalia.com, chenhuacai@kernel.org, geert@linux-m68k.org, vijayb@linux.microsoft.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v4 6/6] memblock: Disable mirror feature if kernelcore is not specified Message-ID: References: <20220613082147.183145-1-mawupeng1@huawei.com> <20220613082147.183145-7-mawupeng1@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; 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bh=41BitnSLFDWAoFwB+s+HzeQPD+zJipNNhI9ni30vy7s=; b=LOMFo6Jn6rvyuI7g1P//ZLE54BtP7DFzrOTxsvMkGKM/3WocdKxIWKPWU9vHtOUqymHr3d msT6Rfm7f1c0T8PF0g/JAyqqklKrxgJERI2Ow4KoMvn1jCRJNJWMvHW7OvjOwIJ5gRjDvN ljsTTsOSyAlNtUJWf/lXmlMo1LJKKsg= X-Rspamd-Queue-Id: 5116C14008A X-Rspam-User: Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uzP0GwrI; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf26.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org X-Stat-Signature: 5o8e191qbbi3pxqe17u14b3xqqcmfqq6 X-Rspamd-Server: rspam02 X-HE-Tag: 1655118319-555930 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jun 13, 2022 at 04:21:47PM +0800, Wupeng Ma wrote: > From: Ma Wupeng > > If system have some mirrored memory and mirrored feature is not specified > in boot parameter, the basic mirrored feature will be enabled and this will > lead to the following situations: > > - memblock memory allocation prefers mirrored region. This may have some > unexpected influence on numa affinity. > > - contiguous memory will be split into several parts if parts of them > is mirrored memory via memblock_mark_mirror(). > > To fix this, variable mirrored_kernelcore will be checked in > memblock_mark_mirror(). Mark mirrored memory with flag MEMBLOCK_MIRROR iff > kernelcore=mirror is added in the kernel parameters. > > Signed-off-by: Ma Wupeng > --- > mm/internal.h | 2 ++ > mm/memblock.c | 3 +++ > mm/page_alloc.c | 2 +- > 3 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/mm/internal.h b/mm/internal.h > index c0f8fbe0445b..ddd2d6a46f1b 100644 > --- a/mm/internal.h > +++ b/mm/internal.h > @@ -861,4 +861,6 @@ struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags); > > DECLARE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); > > +extern bool mirrored_kernelcore; > + > #endif /* __MM_INTERNAL_H */ > diff --git a/mm/memblock.c b/mm/memblock.c > index b1d2a0009733..a9f18b988b7f 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -924,6 +924,9 @@ int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size) > */ > int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size) > { > + if (!mirrored_kernelcore) > + return 0; > + Hmm, this changes the way x86 uses mirrored memory. This change makes sense for x86 as well, but we should get an Ack from x86 folks. > system_has_some_mirror = true; > > return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR); > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index e008a3df0485..9b030aeb4983 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -356,7 +356,7 @@ static unsigned long required_kernelcore_percent __initdata; > static unsigned long required_movablecore __initdata; > static unsigned long required_movablecore_percent __initdata; > static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata; > -static bool mirrored_kernelcore __meminitdata; > +bool mirrored_kernelcore __initdata; > > /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ > int movable_zone; > -- > 2.25.1 > -- Sincerely yours, Mike.