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Wed, 17 Jun 2020 06:57:58 -0700 (PDT) Date: Wed, 17 Jun 2020 14:57:58 +0100 From: Chris Down To: Naresh Kamboju Message-ID: <20200617135758.GA548179@chrisdown.name> References: <20200519075213.GF32497@dhcp22.suse.cz> <20200519084535.GG32497@dhcp22.suse.cz> <20200520190906.GA558281@chrisdown.name> <20200521095515.GK6462@dhcp22.suse.cz> <20200521163450.GV6462@dhcp22.suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.14.3 (2020-06-14) X-Headers-End: 1jlYgC-009RJ3-47 Subject: Re: [f2fs-dev] mm: mkfs.ext4 invoked oom-killer on i386 - pagecache_get_page X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lkft-triage@lists.linaro.org, Michal Hocko , linux-mm , Yafang Shao , Andreas Dilger , Cgroups , Andrea Arcangeli , Anders Roxell , Hugh Dickins , Matthew Wilcox , Linux-Next Mailing List , linux-ext4 , Arnd Bergmann , linux-block , Jaegeuk Kim , Theodore Ts'o , open list , "Linux F2FS DEV, Mailing List" , Johannes Weiner , Andrew Morton , Roman Gushchin Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Naresh Kamboju writes: >mkfs -t ext4 /dev/disk/by-id/ata-TOSHIBA_MG04ACA100N_Y8RQK14KF6XF >mke2fs 1.43.8 (1-Jan-2018) >Creating filesystem with 244190646 4k blocks and 61054976 inodes >Filesystem UUID: 7c380766-0ed8-41ba-a0de-3c08e78f1891 >Superblock backups stored on blocks: >32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, >4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, >102400000, 214990848 >Allocating group tables: 0/7453 done >Writing inode tables: 0/7453 done >Creating journal (262144 blocks): [ 51.544525] under min:0 emin:0 >[ 51.845304] under min:0 emin:0 >[ 51.848738] under min:0 emin:0 >[ 51.858147] under min:0 emin:0 >[ 51.861333] under min:0 emin:0 >[ 51.862034] under min:0 emin:0 >[ 51.862442] under min:0 emin:0 >[ 51.862763] under min:0 emin:0 Thanks, this helps a lot. Somehow we're entering mem_cgroup_below_min even when min/emin is 0 (which should indeed be the case if you haven't set them in the hierarchy). My guess is that page_counter_read(&memcg->memory) is 0, which means mem_cgroup_below_min will return 1. However, I don't know for sure why that should then result in the OOM killer coming along. My guess is that since this memcg has 0 pages to scan anyway, we enter premature OOM under some conditions. I don't know why we wouldn't have hit that with the old version of mem_cgroup_protected that returned MEMCG_PROT_* members, though. Can you please try the patch with the `>=` checks in mem_cgroup_below_min and mem_cgroup_below_low changed to `>`? If that fixes it, then that gives a strong hint about what's going on here. Thanks for your help! _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel