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: 13290006 X-Patchwork-Delegate: snitzer@redhat.com 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 us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 25598C0015E for ; Fri, 23 Jun 2023 05:26:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1687498012; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=FyACrvzp0LgLajxlGeuRsxxjkBEraosmx5suUlKSvmc=; b=bZIYWeDaU3bzVqI33KzmdW/f7LPpeYUU2d2aKq94c6DFtpYyITO8c7jKDNDCuHK/Y0gzRJ MMnnSPlJd3pZvidnNGTY5sMnGrJktAuYTZMPiVRJYC7ZUg5AldJdleewAJeE1REV3gSJ3C Fg3x6u6zskln7nlYzpb1Gyvxr6FVTJY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-670-SRWKmVsKPAimiV9DJujNdA-1; Fri, 23 Jun 2023 01:26:47 -0400 X-MC-Unique: SRWKmVsKPAimiV9DJujNdA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2994C1064AFC; Fri, 23 Jun 2023 05:26:19 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (unknown [10.30.29.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id 19613404A425; Fri, 23 Jun 2023 05:26:19 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (localhost [IPv6:::1]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id E6DDF193775B; Fri, 23 Jun 2023 05:25:47 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 8ED241946587 for ; Thu, 22 Jun 2023 08:55:30 +0000 (UTC) Received: by smtp.corp.redhat.com (Postfix) id 6C0D841EF82; Thu, 22 Jun 2023 08:55:30 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast07.extmail.prod.ext.rdu2.redhat.com [10.11.55.23]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 63D57492C13 for ; Thu, 22 Jun 2023 08:55:30 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 495C03C13509 for ; Thu, 22 Jun 2023 08:55:30 +0000 (UTC) Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-73-mbQcmkxANQi-sJgrP1A3BA-1; Thu, 22 Jun 2023 04:55:24 -0400 X-MC-Unique: mbQcmkxANQi-sJgrP1A3BA-1 Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-1b5466bc5f8so9653965ad.1 for ; Thu, 22 Jun 2023 01:55:24 -0700 (PDT) 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=O1eZDhka1JtisGYzUcIY+LizRYi9AWM8jDH6FZuIchvEGEPSY919UtOLoZdoCMcWKW eRUE5vvVl3KzoFl2iN5TdqosQ87WIvzXWbgwEwn5+PzXvn0RyRP5K4XTcH2PkJUR/sZ9 v23e6M0BYC3pNKswF/SfoomPAapbQcI8m5aN8hKTjNklbsZS43Mcgs+qthRkv6snoafe +ob3EBsNOjujxzSKf1nFW4jgxZXil/g589j8Tpqxo0RqA7js14JlH1JFwWIzWh2u9sOc +gsd3XFWqValmKMLSX6E2NfBK2d2cgOy3ZkHl1fzVpmASoTH5jW4uiHWUBGolpx+XrHB qH2A== X-Gm-Message-State: AC+VfDyygL1vxoCEEPsRZo4OeQ+zQZ3FFUUSmPydrXmrrNCZGZvwfSBj HuScZYRp2qjtYIzvacIOLia5Zw== 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 Date: Thu, 22 Jun 2023 16:53:16 +0800 Message-Id: <20230622085335.77010-11-zhengqi.arch@bytedance.com> In-Reply-To: <20230622085335.77010-1-zhengqi.arch@bytedance.com> References: <20230622085335.77010-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mailman-Approved-At: Fri, 23 Jun 2023 05:25:40 +0000 Subject: [dm-devel] [PATCH 10/29] vmw_balloon: dynamically allocate the vmw-balloon shrinker X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-bcache@vger.kernel.org, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linux-raid@vger.kernel.org, linux-mm@kvack.org, dm-devel@redhat.com, Qi Zheng , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: bytedance.com 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; }