From patchwork Thu Jun 22 08:39:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zheng X-Patchwork-Id: 13288495 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 0456BC001B3 for ; Thu, 22 Jun 2023 08:42:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231324AbjFVImh (ORCPT ); Thu, 22 Jun 2023 04:42:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230014AbjFVIl4 (ORCPT ); Thu, 22 Jun 2023 04:41:56 -0400 X-Greylist: delayed 72 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Thu, 22 Jun 2023 01:41:16 PDT Received: from out-22.mta1.migadu.com (out-22.mta1.migadu.com [95.215.58.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 795191FF6; Thu, 22 Jun 2023 01:41:15 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1687423270; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d+AM9AbU04XIkkoYvbopAzRmafCipQHXZK8a6yWOVaI=; b=Rt6sUHgDiz0buDFWoRsy0JmrKjzmMej9/+xDlubVaxRuAM1omPxRfGEiGbO/u++P6qT8OT vFU86inmnxKhzxlFlP/jNKu4tSE/qwVDpnPDU6KzPqJgVzjXg8XwfcJz0tLWWkfVol8igm J9AOSXjRae20nP2HluZSJpqMGnfJGyM= 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, freedreno@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 08:39:13 +0000 Message-Id: <20230622083932.4090339-11-qi.zheng@linux.dev> In-Reply-To: <20230622083932.4090339-1-qi.zheng@linux.dev> References: <20230622083932.4090339-1-qi.zheng@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Qi Zheng 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; }