From patchwork Thu Jun 22 08:53:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288641 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E450EB64DB for ; Thu, 22 Jun 2023 08:58:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231653AbjFVI6O (ORCPT ); Thu, 22 Jun 2023 04:58:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231496AbjFVI53 (ORCPT ); Thu, 22 Jun 2023 04:57:29 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C10B42113 for ; Thu, 22 Jun 2023 01:55:23 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id d9443c01a7336-1b5466bc5f8so9654015ad.1 for ; Thu, 22 Jun 2023 01:55:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1687424123; x=1690016123; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=u/vExFBLW3qTniAw4XeP9KQ69i9zow/4wwrpInqlwjM=; b=f9niG/1nDZCnLyGAdmXOPnr0UhYRgdnlIknKHTp5fpAvQQctnSzqFRWkCf20Ww177d QG9jeeQWMuTex/IwaFDMA8vXlH6fpJPO6Zn2dpmhMfbdqmxsLU2UIGO2NDOzTGYWiDw7 ywIPFwnvUTjEHuZeccmcjrjEkLsXSYquHahbHd6ZdjnzqEP2RHdSMNMWgiY9L8TVZ0lC G4aVTSqjJ5NrWtnVCJTDf1mbR/bEFK3aai4gwzFQmPA34Ikuzxs8i6IqNfr5Nxc5N0yO /Hq8+LGyQI4XHPCqHbrNX4k2UTVR4h1zk7vD27aNaHUnKMeOkCqJba/XQtzAGJZToHzN Aj7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687424123; x=1690016123; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=u/vExFBLW3qTniAw4XeP9KQ69i9zow/4wwrpInqlwjM=; b=AhF2pd7JT9ANMmEFHw7bSj65+wRfMX2KKPoLtW6+ANJpJgtQKoCr1iqb1H6wNxkcCp 7OHx9r8BFDmDCWVTNygilVNpzKREC4HTOJQTixs7Xt+jT6/znH695Oi0QZLYYZX314n5 4cg10VoN40ePPRJscGxgJIpPKhRxZR2GsnS4axj5yJgF87vzZ3R3RVoKOXUEgbkHOTuM 48lvqnMoHCbyjoXH2zjhebp4ozMCWWRddE5QB4uqu/GS4Xt1J0iWJFxFzqwbSCk7fBH/ CMjDWWPKJiI+ypKlsOt+mHN/uyeZUw1Frj3E4JbNjZbFFVb2t87Qi+2gatM/Q7SUuzxg cFdg== X-Gm-Message-State: AC+VfDyLTzeYU7W+3CdN1i7D6qkwvDOxVSpPrSR4PNmvKhaPj4KwllfL REva5kgVZiGIK5skn+ltgBJGoQ== X-Google-Smtp-Source: ACHHUZ4R6XsCch8DMbBn2ilzIIAPskFMWcDdECndDXpbpwroXAZTFBoXbn8TaLTiXdt1Xz94/St+OA== X-Received: by 2002:a17:902:dac6:b0:1a1:956d:2281 with SMTP id q6-20020a170902dac600b001a1956d2281mr22035085plx.3.1687424123198; Thu, 22 Jun 2023 01:55:23 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.254]) by smtp.gmail.com with ESMTPSA id h2-20020a170902f7c200b001b549fce345sm4806971plw.230.2023.06.22.01.55.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Jun 2023 01:55:22 -0700 (PDT) From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng Subject: [PATCH 10/29] vmw_balloon: dynamically allocate the vmw-balloon shrinker Date: Thu, 22 Jun 2023 16:53:16 +0800 Message-Id: <20230622085335.77010-11-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230622085335.77010-1-zhengqi.arch@bytedance.com> References: <20230622085335.77010-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org In preparation for implementing lockless slab shrink, we need to dynamically allocate the vmw-balloon shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct vmballoon. Signed-off-by: Qi Zheng --- drivers/misc/vmw_balloon.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 9ce9b9e0e9b6..2f86f666b476 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -380,7 +380,7 @@ struct vmballoon { /** * @shrinker: shrinker interface that is used to avoid over-inflation. */ - struct shrinker shrinker; + struct shrinker *shrinker; /** * @shrinker_registered: whether the shrinker was registered. @@ -1569,7 +1569,7 @@ static unsigned long vmballoon_shrinker_count(struct shrinker *shrinker, static void vmballoon_unregister_shrinker(struct vmballoon *b) { if (b->shrinker_registered) - unregister_shrinker(&b->shrinker); + unregister_and_free_shrinker(b->shrinker); b->shrinker_registered = false; } @@ -1581,14 +1581,18 @@ static int vmballoon_register_shrinker(struct vmballoon *b) if (!vmwballoon_shrinker_enable) return 0; - b->shrinker.scan_objects = vmballoon_shrinker_scan; - b->shrinker.count_objects = vmballoon_shrinker_count; - b->shrinker.seeks = DEFAULT_SEEKS; + b->shrinker = shrinker_alloc_and_init(vmballoon_shrinker_count, + vmballoon_shrinker_scan, + 0, DEFAULT_SEEKS, 0, b); + if (!b->shrinker) + return -ENOMEM; - r = register_shrinker(&b->shrinker, "vmw-balloon"); + r = register_shrinker(b->shrinker, "vmw-balloon"); if (r == 0) b->shrinker_registered = true; + else + shrinker_free(b->shrinker); return r; }