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=-6.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 60CC3C2D0A8 for ; Mon, 28 Sep 2020 20:31:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F8722080A for ; Mon, 28 Sep 2020 20:31:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="Lt7HOcW8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726847AbgI1UbP (ORCPT ); Mon, 28 Sep 2020 16:31:15 -0400 Received: from z5.mailgun.us ([104.130.96.5]:37353 "EHLO z5.mailgun.us" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726656AbgI1UbO (ORCPT ); Mon, 28 Sep 2020 16:31:14 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1601325074; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=HvqRlccboJRskCbBGoZiwAwl9Is6Q+EApiZuGx+9fRk=; b=Lt7HOcW8CYcfjCKBr6h7Boy6W7ZdfzPTgbrpxRF9cWPBegIOwxXDx2GCO/RQ8cnBATm6+XxR DEcvkS8v9qQ+8B857Q9CqkOxCboTTp4tePWSO6tGJFFz5Nvoxni9Q2FchvED2q0aXj+qNidD MUedhFGfPCcQ4IvPg/c0p9Uwr8c= X-Mailgun-Sending-Ip: 104.130.96.5 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-east-1.postgun.com with SMTP id 5f7247fdf38f205ebc529dfb (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 28 Sep 2020 20:30:53 GMT Sender: cgoldswo=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id F2239C433CB; Mon, 28 Sep 2020 20:30:52 +0000 (UTC) Received: from cgoldswo-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cgoldswo) by smtp.codeaurora.org (Postfix) with ESMTPSA id 9E4C4C433CA; Mon, 28 Sep 2020 20:30:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 9E4C4C433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=cgoldswo@codeaurora.org From: Chris Goldsworthy To: akpm@linux-foundation.org, linux-mm@kvack.org, minchan@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, pratikp@codeaurora.org, pdaly@codeaurora.org, sudaraja@codeaurora.org, iamjoonsoo.kim@lge.com, david@redhat.com, vinmenon@codeaurora.org, minchan.kim@gmail.com Cc: Chris Goldsworthy Subject: [PATCH v4] mm: cma: indefinitely retry allocations in cma_alloc Date: Mon, 28 Sep 2020 13:30:26 -0700 Message-Id: X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org V1: Introduces a retry loop that attempts a CMA allocation a finite number of times before giving up: https://lkml.org/lkml/2020/8/5/1097 https://lkml.org/lkml/2020/8/11/893 V2: Introduces an indefinite retry for CMA allocations. David Hildenbrand raised a page pinning example which precludes doing this infite-retrying for all CMA users: https://lkml.org/lkml/2020/9/17/984 V3: Re-introduce a GFP mask argument for cma_alloc(), that can take in __GFP_NOFAIL as an argument to indicate that a CMA allocation should be retried indefinitely. This lets callers of cma_alloc() decide if they want to perform indefinite retires. Also introduces a config option for controlling the duration of the sleep between retries: https://www.spinics.net/lists/linux-mm/msg228778.html V4: In response to comments by Minchan Kim, we make the sleep interruptable and remove a defconfig option controlling how long the sleep lasts for (it is now a fixed 100 ms). Chris Goldsworthy (1): mm: cma: indefinitely retry allocations in cma_alloc arch/powerpc/kvm/book3s_hv_builtin.c | 2 +- drivers/dma-buf/heaps/cma_heap.c | 2 +- drivers/s390/char/vmcp.c | 2 +- drivers/staging/android/ion/ion_cma_heap.c | 2 +- include/linux/cma.h | 2 +- kernel/dma/contiguous.c | 4 ++-- mm/cma.c | 36 +++++++++++++++++++++++++----- mm/cma_debug.c | 2 +- mm/hugetlb.c | 4 ++-- 9 files changed, 40 insertions(+), 16 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project