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[34.64.229.252]) by smtp.gmail.com with ESMTPSA id n185sm15745891pfn.171.2021.09.20.08.50.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Sep 2021 08:50:14 -0700 (PDT) Date: Mon, 20 Sep 2021 15:50:10 +0000 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: John Garry Cc: Matthew Wilcox , Christoph Lameter , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Jens Axboe Subject: Re: [RFC PATCH] Introducing lockless cache built on top of slab allocator Message-ID: <20210920155010.GA31923@kvm.asia-northeast3-a.c.our-ratio-313919.internal> References: <20210919164239.49905-1-42.hyeyoo@gmail.com> <20210920010938.GA3108@kvm.asia-northeast3-a.c.our-ratio-313919.internal> <56f30136-23ce-dd73-705c-4e1326768c9d@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <56f30136-23ce-dd73-705c-4e1326768c9d@huawei.com> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 1A59E3000096 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=XP9FAEda; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf03.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.215.170 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com X-Stat-Signature: mb4snpeen4yo7nb9mdw4qhss5mow9dcq X-HE-Tag: 1632153015-780751 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, Sep 20, 2021 at 03:41:16PM +0100, John Garry wrote: > On 20/09/2021 02:53, Matthew Wilcox wrote: > > On Mon, Sep 20, 2021 at 01:09:38AM +0000, Hyeonggon Yoo wrote: > > > Hello Matthew, Thanks to give me a comment! I appreciate it. > > > > > > On Sun, Sep 19, 2021 at 08:17:44PM +0100, Matthew Wilcox wrote: > > > > On Sun, Sep 19, 2021 at 04:42:39PM +0000, Hyeonggon Yoo wrote: > > > > > It is just simple proof of concept, and not ready for submission yet. > > > > > There can be wrong code (like wrong gfp flags, or wrong error handling, > > > > > etc) it is just simple proof of concept. I want comment from you. > > > > > > > > Have you read: > > > > > > > > https://www.usenix.org/legacy/event/usenix01/full_papers/bonwick/bonwick_html/ > > > > The relevant part of that paper is section 3, magazines. We should have > > > > low and high water marks for number of objects > > > > > In case unknown, jfyi there is an implementation of this in > drivers/iommu/iova.c Thanks for good information. I'll take a look at it! Thanks, Hyeonggon > Thanks, > John > > > > I haven't read that before, but after reading it seems not different from > > > SLAB's percpu queuing. > > > > and we should allocate > > > > from / free to the slab allocator in batches. Slab has bulk alloc/free > > > > APIs already. > > > >