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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 9166CC388F7 for ; Thu, 22 Oct 2020 22:54:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2702C223C7 for ; Thu, 22 Oct 2020 22:54:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="HYJ0nzsK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S373127AbgJVWyU (ORCPT ); Thu, 22 Oct 2020 18:54:20 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:39768 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S373119AbgJVWyT (ORCPT ); Thu, 22 Oct 2020 18:54:19 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 09MMpKHl011992 for ; Thu, 22 Oct 2020 15:54:18 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : content-type : content-transfer-encoding : mime-version; s=facebook; bh=iaQ6uUUMB3v2zOgoAFTWl7pLBRX74lAv1EY9e2OAqjY=; b=HYJ0nzsKiUyuB8zs5NFyy03Y9MQP5y8F509t7DCidNrBIpRK3EtAiEg7/5/B1S3A37dx MHP+3e9bC6XFlTWEkvE2rNQhG6eKKfmA1yHWYdOc/cTOPe8gTjLlZJS5JrxVeNlfPa3B Ex35skwFrOzdOZ4u0IhjesfEV1XiZB187dk= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 34bbqgb39g-18 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 22 Oct 2020 15:54:18 -0700 Received: from intmgw001.41.prn1.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 22 Oct 2020 15:53:21 -0700 Received: by devvm1755.vll0.facebook.com (Postfix, from userid 111017) id E69E91A3AE48; Thu, 22 Oct 2020 15:53:12 -0700 (PDT) From: Roman Gushchin To: Andrew Morton CC: Zi Yan , Joonsoo Kim , Mike Kravetz , , , , , Roman Gushchin Subject: [PATCH v1 0/2] mm: cma: introduce a non-blocking version of cma_release() Date: Thu, 22 Oct 2020 15:53:06 -0700 Message-ID: <20201022225308.2927890-1-guro@fb.com> X-Mailer: git-send-email 2.24.1 X-FB-Internal: Safe Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.737 definitions=2020-10-22_17:2020-10-20,2020-10-22 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 malwarescore=0 suspectscore=0 mlxlogscore=574 lowpriorityscore=0 impostorscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010220146 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This small patchset introduces a non-blocking version of cma_release() and simplifies the code in hugetlbfs, where previously we had to temporarily drop hugetlb_lock around the cma_release() call. It should help Zi Yan on his work on 1 GB THPs: splitting a gigantic THP under a memory pressure requires a cma_release() call. If it's a blocking function, it complicates the already complicated code. Because there are at least two use cases like this (hugetlbfs is another example), I believe it's just better to make cma_release() non-blocking. v1: - introduce cma_release_nowait() instead of making cma_release() non-blocking, for performance reasons rfc: https://lkml.org/lkml/2020/10/16/1050 Roman Gushchin (2): mm: cma: introduce cma_release_nowait() mm: hugetlb: don't drop hugetlb_lock around cma_release() call include/linux/cma.h | 2 + mm/cma.c | 93 +++++++++++++++++++++++++++++++++++++++++++++ mm/cma.h | 5 +++ mm/hugetlb.c | 11 ++---- 4 files changed, 103 insertions(+), 8 deletions(-) --=20 2.26.2