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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 23A80C433EF for ; Wed, 2 Mar 2022 02:40:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239122AbiCBCk5 (ORCPT ); Tue, 1 Mar 2022 21:40:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232563AbiCBCkz (ORCPT ); Tue, 1 Mar 2022 21:40:55 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91D713465D for ; Tue, 1 Mar 2022 18:40:13 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2B692616B5 for ; Wed, 2 Mar 2022 02:40:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8B8AC340EE; Wed, 2 Mar 2022 02:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646188812; bh=xpbzS62wFUB5qKwr+JpG3FXlmb8dShFlcZ/h4z7lRsk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=RsBbmjjm2X8LtdNiC8vfYq00PMrcM4aJshPQnRrqkYdHIJs0V4x/Gjh5/XdLg0tEv nIOMWDt/zgAw4yqToW2+5C1BMJ2RdfQkjFLYzuvN+drJfTTkF9nV9uBfCOEHdm8O14 Yy51I6P7OPnAe734w5lxzFBegnJ9fZwLKWU1HWcHL7GQKdOxyn0riUs2ya6maAKVg1 sN72gTnnvThc8bSvkIMQYk0ScaAoXXfvBgnWt5q8IeTbGK+NVPVUnj6lRzV3xVA9JD +bIm4aJrU1qdjEFQpc/0/MTvcSwCtZH2GwKxVwHqMG4Af0B1S7Fn2rveQk4X/nHJ02 +c0UVr58cDgFg== Message-ID: <4b264607-4d60-7370-eca7-8816a3f8d29f@kernel.org> Date: Wed, 2 Mar 2022 10:40:08 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: Re: [f2fs-dev] [PATCH v2] f2fs: avoid sb_start_intwrite during eviction Content-Language: en-US To: Jaegeuk Kim Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net References: <20220215220039.1477906-1-jaegeuk@kernel.org> <09683b83-b6c0-fe05-0dae-b93cab2f4b63@kernel.org> From: Chao Yu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022/3/1 12:48, Jaegeuk Kim wrote: > 1. waiting for f2fs_evict_inode > [ 5560.043945] __wait_on_freeing_inode+0xac/0xf0 > [ 5560.045540] ? var_wake_function+0x30/0x30 > [ 5560.047036] find_inode_fast+0x6d/0xc0 > [ 5560.048473] iget_locked+0x79/0x230 > [ 5560.049933] f2fs_iget+0x27/0x1200 [f2fs] > [ 5560.051496] f2fs_lookup+0x18c/0x3e0 [f2fs] > [ 5560.053069] __lookup_slow+0x84/0x150 > [ 5560.054503] walk_component+0x141/0x1b0 > [ 5560.055938] link_path_walk.part.0+0x23b/0x360 > [ 5560.057541] ? end_bio_bh_io_sync+0x37/0x50 > [ 5560.059086] path_parentat+0x3c/0x90 > [ 5560.060492] filename_parentat+0xd7/0x1e0 > [ 5560.062002] ? blk_mq_free_request+0x127/0x150 > [ 5560.063576] do_renameat2+0xc1/0x5b0 > --> sb_start_write(m->mnt_sb); -> __sb_start_write(sb, SB_FREEZE_WRITE); > > [ 5560.064999] ? __check_object_size+0x13f/0x150 > [ 5560.066559] ? strncpy_from_user+0x44/0x150 > [ 5560.068038] ? getname_flags.part.0+0x4c/0x1b0 > [ 5560.069617] __x64_sys_renameat2+0x51/0x60 > > 2. waiting for sb_start_intwrite -> __sb_start_write(sb, SB_FREEZE_FS); It's still not clear that why __sb_start_write(sb, SB_FREEZE_FS) will be blocked, as SB_FREEZE_FS and SB_FREEZE_WRITE points to different locks. Thread A Thread B Thread C - rename - sb_start_write - __sb_start_write(SB_FREEZE_WRITE) ... - f2fs_lookup ... - __wait_on_freeing_inode - drop_slab - prune_icache_sb - inode_lru_isolate :inode->i_state |= I_FREEING - Is there any flow that it has already held SB_FREEZE_FS and try to lock SB_FREEZE_WRITE? - f2fs_evict_inode - __sb_start_write(SB_FREEZE_FS) Thanks, > > [ 5560.152447] percpu_rwsem_wait+0xaf/0x160 > [ 5560.154000] ? percpu_down_write+0xd0/0xd0 > [ 5560.155498] __percpu_down_read+0x4e/0x60 > [ 5560.157000] f2fs_evict_inode+0x5a3/0x610 [f2fs] > [ 5560.158648] ? var_wake_function+0x30/0x30 > [ 5560.160341] evict+0xd2/0x180 > [ 5560.161728] prune_icache_sb+0x81/0xb0 > --> inode_lru_isolate() -> inode->i_state |= I_FREEING; > > [ 5560.163179] super_cache_scan+0x169/0x1f0 > [ 5560.164675] do_shrink_slab+0x145/0x2b0 > [ 5560.166121] shrink_slab+0x186/0x2d0 > [ 5560.167481] drop_slab_node+0x4a/0x90 > [ 5560.168876] drop_slab+0x3e/0x80 > [ 5560.170178] drop_caches_sysctl_handler+0x75/0x90 > [ 5560.171761] proc_sys_call_handler+0x149/0x280 > [ 5560.173328] proc_sys_write+0x13/0x20 > [ 5560.174667] new_sync_write+0x117/0x1b0 > [ 5560.176120] vfs_write+0x1d5/0x270 > [ 5560.177409] ksys_write+0x67/0xe0 > > Signed-off-by: Jaegeuk Kim > --- > Note, I found this call stack. > > fs/f2fs/inode.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index ab8e0c06c78c..882db4bd917b 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -778,7 +778,6 @@ void f2fs_evict_inode(struct inode *inode) > f2fs_remove_ino_entry(sbi, inode->i_ino, UPDATE_INO); > f2fs_remove_ino_entry(sbi, inode->i_ino, FLUSH_INO); > > - sb_start_intwrite(inode->i_sb); > set_inode_flag(inode, FI_NO_ALLOC); > i_size_write(inode, 0); > retry: > @@ -809,7 +808,6 @@ void f2fs_evict_inode(struct inode *inode) > if (dquot_initialize_needed(inode)) > set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR); > } > - sb_end_intwrite(inode->i_sb); > no_delete: > dquot_drop(inode); > 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 lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (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 3DBDAC433EF for ; Wed, 2 Mar 2022 02:40:32 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.94.2) (envelope-from ) id 1nPEul-0008Hz-Ak; Wed, 02 Mar 2022 02:40:30 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nPEui-0008Ht-Mj for linux-f2fs-devel@lists.sourceforge.net; 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charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2022/3/1 12:48, Jaegeuk Kim wrote: > 1. waiting for f2fs_evict_inode > [ 5560.043945] __wait_on_freeing_inode+0xac/0xf0 > [ 5560.045540] ? var_wake_function+0x30/0x30 > [ 5560.047036] find_inode_fast+0x6d/0xc0 > [ 5560.048473] iget_locked+0x79/0x230 > [ 5560.049933] f2fs_iget+0x27/0x1200 [f2fs] > [ 5560.051496] f2fs_lookup+0x18c/0x3e0 [f2fs] > [ 5560.053069] __lookup_slow+0x84/0x150 > [ 5560.054503] walk_component+0x141/0x1b0 > [ 5560.055938] link_path_walk.part.0+0x23b/0x360 > [ 5560.057541] ? end_bio_bh_io_sync+0x37/0x50 > [ 5560.059086] path_parentat+0x3c/0x90 > [ 5560.060492] filename_parentat+0xd7/0x1e0 > [ 5560.062002] ? blk_mq_free_request+0x127/0x150 > [ 5560.063576] do_renameat2+0xc1/0x5b0 > --> sb_start_write(m->mnt_sb); -> __sb_start_write(sb, SB_FREEZE_WRITE); > > [ 5560.064999] ? __check_object_size+0x13f/0x150 > [ 5560.066559] ? strncpy_from_user+0x44/0x150 > [ 5560.068038] ? getname_flags.part.0+0x4c/0x1b0 > [ 5560.069617] __x64_sys_renameat2+0x51/0x60 > > 2. waiting for sb_start_intwrite -> __sb_start_write(sb, SB_FREEZE_FS); It's still not clear that why __sb_start_write(sb, SB_FREEZE_FS) will be blocked, as SB_FREEZE_FS and SB_FREEZE_WRITE points to different locks. Thread A Thread B Thread C - rename - sb_start_write - __sb_start_write(SB_FREEZE_WRITE) ... - f2fs_lookup ... - __wait_on_freeing_inode - drop_slab - prune_icache_sb - inode_lru_isolate :inode->i_state |= I_FREEING - Is there any flow that it has already held SB_FREEZE_FS and try to lock SB_FREEZE_WRITE? - f2fs_evict_inode - __sb_start_write(SB_FREEZE_FS) Thanks, > > [ 5560.152447] percpu_rwsem_wait+0xaf/0x160 > [ 5560.154000] ? percpu_down_write+0xd0/0xd0 > [ 5560.155498] __percpu_down_read+0x4e/0x60 > [ 5560.157000] f2fs_evict_inode+0x5a3/0x610 [f2fs] > [ 5560.158648] ? var_wake_function+0x30/0x30 > [ 5560.160341] evict+0xd2/0x180 > [ 5560.161728] prune_icache_sb+0x81/0xb0 > --> inode_lru_isolate() -> inode->i_state |= I_FREEING; > > [ 5560.163179] super_cache_scan+0x169/0x1f0 > [ 5560.164675] do_shrink_slab+0x145/0x2b0 > [ 5560.166121] shrink_slab+0x186/0x2d0 > [ 5560.167481] drop_slab_node+0x4a/0x90 > [ 5560.168876] drop_slab+0x3e/0x80 > [ 5560.170178] drop_caches_sysctl_handler+0x75/0x90 > [ 5560.171761] proc_sys_call_handler+0x149/0x280 > [ 5560.173328] proc_sys_write+0x13/0x20 > [ 5560.174667] new_sync_write+0x117/0x1b0 > [ 5560.176120] vfs_write+0x1d5/0x270 > [ 5560.177409] ksys_write+0x67/0xe0 > > Signed-off-by: Jaegeuk Kim > --- > Note, I found this call stack. > > fs/f2fs/inode.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > index ab8e0c06c78c..882db4bd917b 100644 > --- a/fs/f2fs/inode.c > +++ b/fs/f2fs/inode.c > @@ -778,7 +778,6 @@ void f2fs_evict_inode(struct inode *inode) > f2fs_remove_ino_entry(sbi, inode->i_ino, UPDATE_INO); > f2fs_remove_ino_entry(sbi, inode->i_ino, FLUSH_INO); > > - sb_start_intwrite(inode->i_sb); > set_inode_flag(inode, FI_NO_ALLOC); > i_size_write(inode, 0); > retry: > @@ -809,7 +808,6 @@ void f2fs_evict_inode(struct inode *inode) > if (dquot_initialize_needed(inode)) > set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR); > } > - sb_end_intwrite(inode->i_sb); > no_delete: > dquot_drop(inode); > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel