From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C99C9C07E95 for ; Wed, 7 Jul 2021 06:39:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4D85E61CA8 for ; Wed, 7 Jul 2021 06:39:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4D85E61CA8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 122596B0036; Wed, 7 Jul 2021 02:39:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0ACEA6B005D; Wed, 7 Jul 2021 02:39:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E66FF6B006C; Wed, 7 Jul 2021 02:39:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0230.hostedemail.com [216.40.44.230]) by kanga.kvack.org (Postfix) with ESMTP id ADA346B0036 for ; Wed, 7 Jul 2021 02:39:26 -0400 (EDT) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id EE07D8249980 for ; Wed, 7 Jul 2021 06:39:25 +0000 (UTC) X-FDA: 78334840290.27.CED680F Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf09.hostedemail.com (Postfix) with ESMTP id 0DCF4300302D for ; Wed, 7 Jul 2021 06:39:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=bc4Z0xsNZ+Qib25Sb0XowG/YW6Uaak0wMUKXosyWUSc=; b=VVAbl5BoRPxb4NyG3wYR3XHH84 js9nmtGeUMcyPETf1DqawXv1d9riVJBY1fKovhK9jXHYOkoRU4ebXu2jZqmjDu4lgqPaNs6SeR+/A z/JhLRTrred07bqtmWNcnS8f/5j7C3EjJEcMx5h7FExrcrnLAPbjl2VdNCvCdAo39ZN8pUbNAGreq LdwCiPCOxZIEHZbWI+ymmJePW+BTJLid0hqmr6SZg3++ZLTT9J8W2j046jvY8x9+A/jecwIyUFsiO s3fD6fbV9D0xXdz7WZGGIWJKtRNk1PRZpabt8RJKou7JgZxNddHi8/fhTmYa8ftIgMYxZ3dcGlwJB +FpEkujQ==; Received: from hch by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m11CH-00C7za-Sn; Wed, 07 Jul 2021 06:38:19 +0000 Date: Wed, 7 Jul 2021 07:38:13 +0100 From: Christoph Hellwig To: John Stultz Cc: lkml , Daniel Vetter , Christian Koenig , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , ??rjan Eide , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Mel Gorman , linux-mm@kvack.org Subject: page pools, was Re: [PATCH v9 1/5] drm: Add a sharable drm page-pool implementation Message-ID: References: <20210630013421.735092-1-john.stultz@linaro.org> <20210630013421.735092-2-john.stultz@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210630013421.735092-2-john.stultz@linaro.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0DCF4300302D X-Stat-Signature: ojbbhc1th4jinhpn8cpwgrn3foqppqrt Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=VVAbl5Bo; dmarc=none; spf=none (imf09.hostedemail.com: domain of BATV@casper.srs.infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=BATV@casper.srs.infradead.org X-HE-Tag: 1625639963-985544 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 Wed, Jun 30, 2021 at 01:34:17AM +0000, John Stultz wrote: > This adds a shrinker controlled page pool, extracted > out of the ttm_pool logic, and abstracted out a bit > so it can be used by other non-ttm drivers. Can you explain in detail why you need a differnt page pool over the one maintained by the page allocator? Fragmenting the memory into all kinds of pools has lots of downsides, so the upsides need to be explained in detail.