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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A3CE0C001DE for ; Wed, 26 Jul 2023 07:57:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:To:References:Message-Id:Cc:Date: In-Reply-To:From:Subject:MIME-Version:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=2ryxNwtUy0uXrtGABjB9RyWoKBkR4qXIBnXRDshmMdg=; b=41dhAk8/Yr/0Ih Hu4cHsP3c+2MX/OlxFTwZIxyjULStxC4wYHJgA3HP7UeCF9mooeKNE9v1+R9VAm5iOEymbcypKHUW froWOd8DxG5gkP+IJTtYb3dQ3nnmiFcNWgaEf4w8ztPFuHSdtUSWS/dq1ugxuZpYE1n/9vYV/JviR a1hThQLl4q4cexZsZ6mRz2buKK8RWxWLxw4mI7QnddHh7zBFIjoRc4Lp7kCRgH4rxZX1yKZynzWOj getYaLaMKdnrvC2FOZyRmjbONAmtmgW7AisujdE1lGs2TbOK5mrhalcE01nZH2pmi8bJ6/6G13aqZ ZBMGKuvFPDMPeRSWyH4Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qOZOZ-009WOX-0B; Wed, 26 Jul 2023 07:57:19 +0000 Received: from out-32.mta1.migadu.com ([95.215.58.32]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qOZOW-009WNH-1B for linux-mtd@lists.infradead.org; Wed, 26 Jul 2023 07:57:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1690358232; h=from:from: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; bh=DrTjaApThAuzzzwg/AJ38QfJI73QqK5cZWNfOYAaBzo=; b=wmb9Oc63rqgJphlqbAiUGQf+QfWRu1BB5RekgtePch6TWeTBhXF8/rZbaJe3xMLy22V28n AB61q+qfNpO4zxg1WfzVWjZzQVs0/ao+ef/zXMB6L8A11iP2pUjCxTGOuptX1W/mgnuJdh cKneJyV5E4YSzAPypp2CHjNMfrcxLhY= MIME-Version: 1.0 Subject: Re: [PATCH v2 42/47] drm/ttm: introduce pool_shrink_rwsem X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: <20230724094354.90817-43-zhengqi.arch@bytedance.com> Date: Wed, 26 Jul 2023 15:56:40 +0800 Cc: Andrew Morton , david@fromorbit.com, tkhai@ya.ru, Vlastimil Babka , Roman Gushchin , djwong@kernel.org, Christian Brauner , "Paul E. McKenney" , tytso@mit.edu, steven.price@arm.com, cel@kernel.org, Sergey Senozhatsky , yujie.liu@intel.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-mtd@lists.infradead.org, rcu@vger.kernel.org, netdev@vger.kernel.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-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org Message-Id: References: <20230724094354.90817-1-zhengqi.arch@bytedance.com> <20230724094354.90817-43-zhengqi.arch@bytedance.com> To: Qi Zheng X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230726_005716_549591_CB5A3E69 X-CRM114-Status: UNSURE ( 9.02 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org > On Jul 24, 2023, at 17:43, Qi Zheng wrote: > > Currently, the synchronize_shrinkers() is only used by TTM pool. It only > requires that no shrinkers run in parallel. > > After we use RCU+refcount method to implement the lockless slab shrink, > we can not use shrinker_rwsem or synchronize_rcu() to guarantee that all > shrinker invocations have seen an update before freeing memory. > > So we introduce a new pool_shrink_rwsem to implement a private > synchronize_shrinkers(), so as to achieve the same purpose. > > Signed-off-by: Qi Zheng Reviewed-by: Muchun Song ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/