linux-kernel - Re: [PATCH 2/3] workqueues: microoptimize set_wq

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Date:	Thu, 25 Feb 2010 19:27:46 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Samu Onkalo <samu.p.onkalo@...ia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] workqueues: microoptimize set_wq_data()

Hello, again.

On 02/25/2010 12:10 PM, Tejun Heo wrote:
>> @@ -220,12 +220,9 @@ struct cpu_workqueue_struct *wq_per_cpu(
>>  static inline void set_wq_data(struct work_struct *work,
>>  				struct cpu_workqueue_struct *cwq)
>>  {
>> -	unsigned long new;
>> -
>> -	BUG_ON(!work_pending(work));
>> -
>> -	new = (unsigned long) cwq | (1UL << WORK_STRUCT_PENDING);
>> +	unsigned long new = (unsigned long)cwq;
>>  	new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
>> +	BUG_ON(!(new & (1UL << WORK_STRUCT_PENDING)));
>>  	atomic_long_set(&work->data, new);
> 
> Will apply under cmwq patches for the next merge window.

Turns out I already have a patch which kills the second
work_data_bits() dereferencing in the series.  The first one is now in
the cmwq series which is about to be posted again.

Thanks.

-- 
tejun
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