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Tue, 18 Feb 2020 08:41:27 +0000 (UTC) Subject: Re: btrfs: convert metadata from raid5 to raid1 To: Menion , =?UTF-8?Q?Sw=c3=a2mi_Petaramesh?= Cc: linux-btrfs References: <641d8ba2-89c1-83ac-155f-f661f511218a@petaramesh.org> From: Nikolay Borisov Autocrypt: addr=nborisov@suse.com; prefer-encrypt=mutual; keydata= xsFNBFiKBz4BEADNHZmqwhuN6EAzXj9SpPpH/nSSP8YgfwoOqwrP+JR4pIqRK0AWWeWCSwmZ T7g+RbfPFlmQp+EwFWOtABXlKC54zgSf+uulGwx5JAUFVUIRBmnHOYi/lUiE0yhpnb1KCA7f u/W+DkwGerXqhhe9TvQoGwgCKNfzFPZoM+gZrm+kWv03QLUCr210n4cwaCPJ0Nr9Z3c582xc bCUVbsjt7BN0CFa2BByulrx5xD9sDAYIqfLCcZetAqsTRGxM7LD0kh5WlKzOeAXj5r8DOrU2 GdZS33uKZI/kZJZVytSmZpswDsKhnGzRN1BANGP8sC+WD4eRXajOmNh2HL4P+meO1TlM3GLl EQd2shHFY0qjEo7wxKZI1RyZZ5AgJnSmehrPCyuIyVY210CbMaIKHUIsTqRgY5GaNME24w7h TyyVCy2qAM8fLJ4Vw5bycM/u5xfWm7gyTb9V1TkZ3o1MTrEsrcqFiRrBY94Rs0oQkZvunqia c+NprYSaOG1Cta14o94eMH271Kka/reEwSZkC7T+o9hZ4zi2CcLcY0DXj0qdId7vUKSJjEep c++s8ncFekh1MPhkOgNj8pk17OAESanmDwksmzh1j12lgA5lTFPrJeRNu6/isC2zyZhTwMWs k3LkcTa8ZXxh0RfWAqgx/ogKPk4ZxOXQEZetkEyTFghbRH2BIwARAQABzSJOaWtvbGF5IEJv cmlzb3YgPG5ib3Jpc292QHN1c2UuZGU+wsF4BBMBAgAiBQJYijkSAhsDBgsJCAcDAgYVCAIJ CgsEFgIDAQIeAQIXgAAKCRBxvoJG5T8oV/B6D/9a8EcRPdHg8uLEPywuJR8URwXzkofT5bZE IfGF0Z+Lt2ADe+nLOXrwKsamhweUFAvwEUxxnndovRLPOpWerTOAl47lxad08080jXnGfYFS Dc+ew7C3SFI4tFFHln8Y22Q9075saZ2yQS1ywJy+TFPADIprAZXnPbbbNbGtJLoq0LTiESnD w/SUC6sfikYwGRS94Dc9qO4nWyEvBK3Ql8NkoY0Sjky3B0vL572Gq0ytILDDGYuZVo4alUs8 LeXS5ukoZIw1QYXVstDJQnYjFxYgoQ5uGVi4t7FsFM/6ykYDzbIPNOx49Rbh9W4uKsLVhTzG BDTzdvX4ARl9La2kCQIjjWRg+XGuBM5rxT/NaTS78PXjhqWNYlGc5OhO0l8e5DIS2tXwYMDY LuHYNkkpMFksBslldvNttSNei7xr5VwjVqW4vASk2Aak5AleXZS+xIq2FADPS/XSgIaepyTV tkfnyreep1pk09cjfXY4A7qpEFwazCRZg9LLvYVc2M2eFQHDMtXsH59nOMstXx2OtNMcx5p8 0a5FHXE/HoXz3p9bD0uIUq6p04VYOHsMasHqHPbsMAq9V2OCytJQPWwe46bBjYZCOwG0+x58 fBFreP/NiJNeTQPOa6FoxLOLXMuVtpbcXIqKQDoEte9aMpoj9L24f60G4q+pL/54ql2VRscK d87BTQRYigc+ARAAyJSq9EFk28++SLfg791xOh28tLI6Yr8wwEOvM3wKeTfTZd+caVb9gBBy wxYhIopKlK1zq2YP7ZjTP1aPJGoWvcQZ8fVFdK/1nW+Z8/NTjaOx1mfrrtTGtFxVBdSCgqBB jHTnlDYV1R5plJqK+ggEP1a0mr/rpQ9dFGvgf/5jkVpRnH6BY0aYFPprRL8ZCcdv2DeeicOO YMobD5g7g/poQzHLLeT0+y1qiLIFefNABLN06Lf0GBZC5l8hCM3Rpb4ObyQ4B9PmL/KTn2FV Xq/c0scGMdXD2QeWLePC+yLMhf1fZby1vVJ59pXGq+o7XXfYA7xX0JsTUNxVPx/MgK8aLjYW hX+TRA4bCr4uYt/S3ThDRywSX6Hr1lyp4FJBwgyb8iv42it8KvoeOsHqVbuCIGRCXqGGiaeX Wa0M/oxN1vJjMSIEVzBAPi16tztL/wQtFHJtZAdCnuzFAz8ue6GzvsyBj97pzkBVacwp3/Mw qbiu7sDz7yB0d7J2tFBJYNpVt/Lce6nQhrvon0VqiWeMHxgtQ4k92Eja9u80JDaKnHDdjdwq FUikZirB28UiLPQV6PvCckgIiukmz/5ctAfKpyYRGfez+JbAGl6iCvHYt/wAZ7Oqe/3Cirs5 KhaXBcMmJR1qo8QH8eYZ+qhFE3bSPH446+5oEw8A9v5oonKV7zMAEQEAAcLBXwQYAQIACQUC WIoHPgIbDAAKCRBxvoJG5T8oV1pyD/4zdXdOL0lhkSIjJWGqz7Idvo0wjVHSSQCbOwZDWNTN JBTP0BUxHpPu/Z8gRNNP9/k6i63T4eL1xjy4umTwJaej1X15H8Hsh+zakADyWHadbjcUXCkg OJK4NsfqhMuaIYIHbToi9K5pAKnV953xTrK6oYVyd/Rmkmb+wgsbYQJ0Ur1Ficwhp6qU1CaJ mJwFjaWaVgUERoxcejL4ruds66LM9Z1Qqgoer62ZneID6ovmzpCWbi2sfbz98+kW46aA/w8r 7sulgs1KXWhBSv5aWqKU8C4twKjlV2XsztUUsyrjHFj91j31pnHRklBgXHTD/pSRsN0UvM26 lPs0g3ryVlG5wiZ9+JbI3sKMfbdfdOeLxtL25ujs443rw1s/PVghphoeadVAKMPINeRCgoJH zZV/2Z/myWPRWWl/79amy/9MfxffZqO9rfugRBORY0ywPHLDdo9Kmzoxoxp9w3uTrTLZaT9M KIuxEcV8wcVjr+Wr9zRl06waOCkgrQbTPp631hToxo+4rA1jiQF2M80HAet65ytBVR2pFGZF zGYYLqiG+mpUZ+FPjxk9kpkRYz61mTLSY7tuFljExfJWMGfgSg1OxfLV631jV1TcdUnx+h3l Sqs2vMhAVt14zT8mpIuu2VNxcontxgVr1kzYA/tQg32fVRbGr449j1gw57BV9i0vww== Message-ID: <6ec8e791-549d-37a8-e104-8c6d5b9daee8@suse.com> Date: Tue, 18 Feb 2020 10:41:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 18.02.20 г. 10:34 ч., Menion wrote: > Hello again > > Task completed, I see in three occurrence of this event: > > [518366.156963] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds. > [518366.156989] Not tainted 5.5.3-050503-generic #202002110832 > [518366.157024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [518366.157044] btrfs-cleaner D 0 1034 2 0x80004000 > [518366.157054] Call Trace: > [518366.157082] __schedule+0x2d8/0x760 > [518366.157094] schedule+0x55/0xc0 > [518366.157105] schedule_preempt_disabled+0xe/0x10 > [518366.157113] __mutex_lock.isra.0+0x182/0x4f0 > [518366.157125] __mutex_lock_slowpath+0x13/0x20 > [518366.157132] mutex_lock+0x2e/0x40 > [518366.157261] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] > [518366.157322] ? __wake_up+0x13/0x20 > [518366.157424] cleaner_kthread+0x124/0x130 [btrfs] > [518366.157437] kthread+0x104/0x140 > [518366.157531] ? kzalloc.constprop.0+0x40/0x40 [btrfs] > [518366.157565] ? kthread_park+0x90/0x90 > [518366.157575] ret_from_fork+0x35/0x40 > > and > > [518486.984177] INFO: task btrfs-cleaner:1034 blocked for more than 241 seconds. > [518486.984204] Not tainted 5.5.3-050503-generic #202002110832 > [518486.984216] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [518486.984233] btrfs-cleaner D 0 1034 2 0x80004000 > [518486.984243] Call Trace: > [518486.984271] __schedule+0x2d8/0x760 > [518486.984284] schedule+0x55/0xc0 > [518486.984295] schedule_preempt_disabled+0xe/0x10 > [518486.984305] __mutex_lock.isra.0+0x182/0x4f0 > [518486.984319] __mutex_lock_slowpath+0x13/0x20 > [518486.984326] mutex_lock+0x2e/0x40 > [518486.984451] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] > [518486.984464] ? __wake_up+0x13/0x20 > [518486.984562] cleaner_kthread+0x124/0x130 [btrfs] > [518486.984573] kthread+0x104/0x140 > [518486.984666] ? kzalloc.constprop.0+0x40/0x40 [btrfs] > [518486.984675] ? kthread_park+0x90/0x90 > [518486.984686] ret_from_fork+0x35/0x40 > > and > > [518728.646379] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds. > [518728.646413] Not tainted 5.5.3-050503-generic #202002110832 > [518728.646428] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [518728.646447] btrfs-cleaner D 0 1034 2 0x80004000 > [518728.646460] Call Trace: > [518728.646494] __schedule+0x2d8/0x760 > [518728.646508] schedule+0x55/0xc0 > [518728.646522] schedule_preempt_disabled+0xe/0x10 > [518728.646534] __mutex_lock.isra.0+0x182/0x4f0 > [518728.646550] __mutex_lock_slowpath+0x13/0x20 > [518728.646559] mutex_lock+0x2e/0x40 > [518728.646719] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs] > [518728.646735] ? __wake_up+0x13/0x20 > [518728.646859] cleaner_kthread+0x124/0x130 [btrfs] > [518728.646875] kthread+0x104/0x140 > [518728.647019] ? kzalloc.constprop.0+0x40/0x40 [btrfs] > [518728.647031] ? kthread_park+0x90/0x90 > [518728.647045] ret_from_fork+0x35/0x40 > > Is it a kind of normal? > Thanks, bye provide the output of echo w > /proc/sysrq-trigger I suspect there were 3 times that there was lock contention on delete_unused_bgs_mutex due to balance. Unless it persists it's fine.