From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Bart Van Assche <bvanassche@acm.org>,
Haakon Bugge <haakon.bugge@oracle.com>
Cc: Tejun Heo <tj@kernel.org>,
syzbot <syzbot+831661966588c802aae9@syzkaller.appspotmail.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
LKML <linux-kernel@vger.kernel.org>,
OFED mailing list <linux-rdma@vger.kernel.org>,
"syzkaller-bugs@googlegroups.com"
<syzkaller-bugs@googlegroups.com>,
Lai Jiangshan <jiangshanlai@gmail.com>
Subject: Re: [syzbot] possible deadlock in worker_thread
Date: Wed, 16 Feb 2022 07:05:05 +0900 [thread overview]
Message-ID: <06b2f59c-3c96-9443-7a23-f1c957a41d9b@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <1b70929f-1f73-c549-64c1-94cea2c1a36c@acm.org>
On 2022/02/16 2:05, Bart Van Assche wrote:
> On 2/15/22 04:48, Tetsuo Handa wrote:
>> I do not want to do like
>>
>> - system_wq = alloc_workqueue("events", 0, 0);
>> + system_wq = alloc_workqueue("events", __WQ_SYSTEM_WIDE, 0);
>>
>> because the intent of this change is to ask developers to create their own WQs.
>
> I want more developers to use the system-wide workqueues since that reduces memory usage. That matters for embedded devices running Linux.
Reserving a kernel thread for WQ_MEM_RECLAIM WQ might consume some memory,
but I don't think that creating a !WQ_MEM_RECLAIM WQ consumes much memory.
next prev parent reply other threads:[~2022-02-15 22:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-10 19:27 [syzbot] possible deadlock in worker_thread syzbot
2022-02-11 18:59 ` Bart Van Assche
2022-02-12 5:31 ` Tetsuo Handa
2022-02-12 16:37 ` Bart Van Assche
2022-02-12 17:14 ` Tetsuo Handa
2022-02-13 15:33 ` Leon Romanovsky
2022-02-13 23:06 ` Bart Van Assche
2022-02-14 1:08 ` Tetsuo Handa
2022-02-14 3:44 ` Tejun Heo
2022-02-14 13:36 ` Tetsuo Handa
2022-02-14 17:34 ` Tejun Heo
2022-02-15 10:26 ` Tetsuo Handa
2022-02-15 10:43 ` Haakon Bugge
2022-02-15 12:48 ` Tetsuo Handa
2022-02-15 17:05 ` Bart Van Assche
2022-02-15 22:05 ` Tetsuo Handa [this message]
2022-02-22 18:26 ` Tejun Heo
2022-02-17 11:22 ` [PATCH v2] workqueue: Warn flush attempt using system-wide workqueues Tetsuo Handa
2022-02-22 18:36 ` Tejun Heo
[not found] ` <CGME20220223212048eucas1p1fab5e35ff398eff57808a8f1125dd15f@eucas1p1.samsung.com>
2022-02-23 21:20 ` Marek Szyprowski
2022-02-23 21:35 ` Tejun Heo
2022-02-23 22:06 ` Tetsuo Handa
2022-02-17 12:27 ` [syzbot] possible deadlock in worker_thread Fabio M. De Francesco
2022-02-22 18:30 ` Tejun Heo
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