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[23.128.96.18]) by mx.google.com with ESMTP id bf4si10411845edb.291.2021.03.22.02.07.01; Mon, 22 Mar 2021 02:07:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=nOxEKkHx; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229508AbhCVJDu (ORCPT + 99 others); Mon, 22 Mar 2021 05:03:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229548AbhCVJD2 (ORCPT ); Mon, 22 Mar 2021 05:03:28 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 691FBC061756 for ; Mon, 22 Mar 2021 02:03:28 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id f17so6196342plr.0 for ; Mon, 22 Mar 2021 02:03:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=pAsptSW3SHx362kkQRPfFNxuGD8CX/Lmyp72Cp1h67A=; b=nOxEKkHxNONIJZI0Cvm4WcqpWi6evJwfvPN/AYZX4Ei9DLvA4026T/msmjh3CV48Pf 2cnVXxEOK68GsW/OUk+bHJS9hQ4VsqKOcuvU+PzKHRpqFHWTqA7lXvEaUDx0HFHJO1be a1kh/Sod5qFoBJtwlybpw+h2PLjXNza6XisMA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=pAsptSW3SHx362kkQRPfFNxuGD8CX/Lmyp72Cp1h67A=; b=tqunB/JYiIVVLZ4vxvjLJr6UGryVAuTLKkdSXTkEnDiDWHFvcvnftNmGvE8sExauOP /lnDeSsFmUZiYrYcyrpC736C/CTaz+3NNkcFfL6aNhXVR2FONVPKOHOrjq4TvZbNO66Y b3aVcpV/kelgmU2gEjeRyYYjtculF2A7qO4iuI8PAFnsU0LU19utIgll7z4Sk7IiTQax b5MngvC/8hg93mBCqsF6v3EMyr1W5WlSsvL21gsermSG3SDaD32dSrWjN8WY5avBduh1 +VefnGxKAFB8/csFGDxvDlQpMlNsgL9By6jRwo8O+BI42SJVfBiqofcLf149pFbNcTRB Hrjg== X-Gm-Message-State: AOAM533yj3Al7b+402fEFUGFOxivXWCLPcK0yt2gGKXjPkyETMANfohc uw01jzCWykU7VRIVPtros+DMig== X-Received: by 2002:a17:902:dac9:b029:e4:b52f:1d38 with SMTP id q9-20020a170902dac9b02900e4b52f1d38mr26677110plx.15.1616403807886; Mon, 22 Mar 2021 02:03:27 -0700 (PDT) Received: from google.com ([2409:10:2e40:5100:b1b5:270:5df6:6d6e]) by smtp.gmail.com with ESMTPSA id u79sm12937895pfc.207.2021.03.22.02.03.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 02:03:27 -0700 (PDT) Date: Mon, 22 Mar 2021 18:03:21 +0900 From: Sergey Senozhatsky To: Matthew Wilcox Cc: Namjae Jeon , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-cifs@vger.kernel.org, linux-cifsd-devel@lists.sourceforge.net, smfrench@gmail.com, senozhatsky@chromium.org, hyc.lee@gmail.com, viro@zeniv.linux.org.uk, hch@lst.de, hch@infradead.org, ronniesahlberg@gmail.com, aurelien.aptel@gmail.com, aaptel@suse.com, sandeen@sandeen.net, dan.carpenter@oracle.com, colin.king@canonical.com, rdunlap@infradead.org, Sergey Senozhatsky , Steve French Subject: Re: [PATCH 3/5] cifsd: add file operations Message-ID: References: <20210322051344.1706-1-namjae.jeon@samsung.com> <20210322051344.1706-4-namjae.jeon@samsung.com> <20210322081512.GI1719932@casper.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210322081512.GI1719932@casper.infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (21/03/22 08:15), Matthew Wilcox wrote: > > What's the scenario for which your allocator performs better than slub > IIRC request and reply buffers can be up to 4M in size. So this stuff just allocates a number of fat buffers and keeps them around so that it doesn't have to vmalloc(4M) for every request and every response.