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From: Vlastimil Babka <vbabka@suse.cz>
To: Wang Yugui <wangyugui@e16-tech.com>, linux-mm@kvack.org
Cc: linux-btrfs@vger.kernel.org
Subject: Re: unexpected -ENOMEM from percpu_counter_init()
Date: Wed, 7 Apr 2021 14:35:27 +0200	[thread overview]
Message-ID: <60e9b994-e37c-d059-4af5-0cb7860ca4f3@suse.cz> (raw)
In-Reply-To: <20210401185158.3275.409509F4@e16-tech.com>

+CC btrfs

On 4/1/21 12:51 PM, Wang Yugui wrote:
> Hi,
> 
> an unexpected -ENOMEM from percpu_counter_init() happened when xfstest 
> with kernel 5.11.10 and 5.10.27

Is there a dmesg log showing allocation failure or something?

> direct caller:
> int btrfs_drew_lock_init(struct btrfs_drew_lock *lock)
> {
>     int ret;
> 
>     ret = percpu_counter_init(&lock->writers, 0, GFP_KERNEL);
>     if (ret)
>         return ret;
> 
>     atomic_set(&lock->readers, 0);
>     init_waitqueue_head(&lock->pending_readers);
>     init_waitqueue_head(&lock->pending_writers);
> 
>     return 0;
> }
> 
> upper caller:
>     nofs_flag = memalloc_nofs_save();
>     ret = btrfs_drew_lock_init(&root->snapshot_lock);
>     memalloc_nofs_restore(nofs_flag);
>     if (ret == -ENOMEM) printk("ENOMEM btrfs_drew_lock_init\n");
>     if (ret)
>         goto fail;
> 
> The hardware of this server:
> CPU:  Xeon(R) CPU E5-2660 v2(10 core)  *2
> memory:  192G, no swap
> 
> Only one xfstests job is running in this server, and about 7% of memory
> is used.
> 
> Any advice please.
> 
> Best Regards
> Wang Yugui (wangyugui@e16-tech.com)
> 2021/04/01
> 
> 



  parent reply	other threads:[~2021-04-07 12:35 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01 10:51 Wang Yugui
2021-04-02  1:49 ` Wang Yugui
2021-04-07 12:35 ` Vlastimil Babka [this message]
2021-04-07 13:09   ` Wang Yugui
2021-04-07 14:56     ` Dennis Zhou
2021-04-07 23:28       ` Wang Yugui
2021-04-08  2:44         ` Dennis Zhou
2021-04-08  9:20           ` Wang Yugui
2021-04-08 13:48             ` Dennis Zhou
2021-04-08 14:28               ` Filipe Manana
2021-04-08 15:02                 ` Dennis Zhou
2021-04-09 11:39                   ` Filipe Manana
2021-04-09 13:39                     ` Dennis Zhou
2021-04-09 13:42                       ` Filipe Manana
2021-04-09  0:08               ` Wang Yugui
2021-04-09  2:14                 ` Dennis Zhou
2021-04-09  4:02                   ` Wang Yugui
2021-04-09  7:36                     ` Wang Yugui
2021-04-09  7:48                       ` Wang Yugui
2021-04-09 13:56                       ` Dennis Zhou
2021-04-10 15:29                         ` Wang Yugui
2021-04-10 15:52                           ` Dennis Zhou
2021-04-10 16:08                             ` Wang Yugui
2021-04-11 15:20                               ` Wang Yugui
2021-04-12  4:03                                 ` Dennis Zhou
2021-04-12  5:24                                   ` Wang Yugui
2021-04-09  9:52   ` Wang Yugui

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