From: Jens Axboe <axboe@kernel.dk>
To: Hillf Danton <hdanton@sina.com>
Cc: io-uring@vger.kernel.org, viro@zeniv.linux.org.uk,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC PATCH] io-wq: kill cpu hog worker
Date: Tue, 24 Dec 2019 09:13:30 -0700 [thread overview]
Message-ID: <b91775e3-e6f4-d5dc-0790-60599c96dfd3@kernel.dk> (raw)
In-Reply-To: <20191224115415.1360-1-hdanton@sina.com>
On 12/24/19 4:54 AM, Hillf Danton wrote:
>
> On Mon, 23 Dec 2019 08:15:00 -0700 Jens Axboe wrote:
>>
>> On 12/22/19 7:41 PM, Hillf Danton wrote:
>>>
>>> Reschedule the current IO worker if it is becoming a cpu hog.
>>
>> Might make more sense to put this a bit earlier, to avoid the
>> awkward lock juggle. In theory it shouldn't make a difference
>> if we do it _before_ doing new work, or _after_ doing work. We
>> should only be rescheduling if it's running for quite a while.
>>
>> How about putting it after the flushing of signals instead?
>
>
> All right, thanks.
>
> Hillf
> --->8---
> From: Hillf Danton <hdanton@sina.com>
> Subject: [RFC PATCH] io-wq: kill cpu hog worker
>
> Reschedule the current IO worker to cut the risk that it is becoming
> a cpu hog.
>
> Signed-off-by: Hillf Danton <hdanton@sina.com>
> ---
>
> --- a/fs/io-wq.c
> +++ b/fs/io-wq.c
> @@ -432,6 +432,8 @@ next:
> if (signal_pending(current))
> flush_signals(current);
>
> + cond_resched();
> +
> spin_lock_irq(&worker->lock);
> worker->cur_work = work;
> spin_unlock_irq(&worker->lock);
> --
That looks better, applied.
--
Jens Axboe
prev parent reply other threads:[~2019-12-24 16:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191223024145.11580-1-hdanton@sina.com>
2019-12-23 15:15 ` [RFC PATCH] io-wq: kill cpu hog worker Jens Axboe
[not found] ` <20191224115415.1360-1-hdanton@sina.com>
2019-12-24 16:13 ` Jens Axboe [this message]
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