linux-kernel - Re: [PATCH v2 4/5] locking/lockdep: Make class->ops a percpu counter

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Date:   Thu, 4 Oct 2018 09:05:19 -0400
From:   Waiman Long <longman@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] locking/lockdep: Make class->ops a percpu counter

On 10/04/2018 06:14 AM, Ingo Molnar wrote:
> * Waiman Long <longman@...hat.com> wrote:
>
>> diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
>> index b0d0b51c4d85..1fd82ff99c65 100644
>> --- a/include/linux/lockdep.h
>> +++ b/include/linux/lockdep.h
>> @@ -99,13 +99,8 @@ struct lock_class {
>>  	 */
>>  	unsigned int			version;
>>  
>> -	/*
>> -	 * Statistics counter:
>> -	 */
>> -	unsigned long			ops;
>> -
>> -	const char			*name;
>>  	int				name_version;
>> +	const char			*name;
> 'name' gets moved by the patch - better structure packing on 64-bit kernels?
>
> Looks good to me otherwise.
>
> Thanks,
>
> 	Ingo

Yes, that is done on purpose to pack the 2 integers together to remove
two 4-byte holes on 64-bit archs.

Cheers,
Longman