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From: Valentin Schneider <valentin.schneider@arm.com>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: mingo@redhat.com, peterz@infradead.org,
	linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
	linux-block@vger.kernel.org, dm-devel@redhat.com,
	axboe@kernel.dk, aarcange@redhat.com
Subject: Re: [PATCH] sched: make struct task_struct::state 32-bit
Date: Tue, 3 Sep 2019 17:31:46 +0100	[thread overview]
Message-ID: <64003dcd-d954-b76d-856a-214ff11ac000@arm.com> (raw)
In-Reply-To: <20190903162303.GA2173@avx2>



On 03/09/2019 17:23, Alexey Dobriyan wrote:
> On Tue, Sep 03, 2019 at 12:02:38AM +0100, Valentin Schneider wrote:
>> struct task_struct {
>> 	struct thread_info         thread_info;          /*     0    24 */
>> 	volatile int               state;                /*    24     4 */
>>
>> 	/* XXX 4 bytes hole, try to pack */
>>
>> 	void *                     stack;                /*    32     8 */
>>
>> Though seeing as this is also the boundary of the randomized layout we can't
>> really do much better without changing the boundary itself. So much for
>> cacheline use :/
> 
> Cacheline use of task_struct is pretty hopeless because of all the ifdefs.
> 

Yeah I figured, then had a minute of silence for those forsaken bytes.

  reply	other threads:[~2019-09-03 16:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-02 21:05 [PATCH] sched: make struct task_struct::state 32-bit Alexey Dobriyan
2019-09-02 23:02 ` Valentin Schneider
2019-09-03 16:23   ` Alexey Dobriyan
2019-09-03 16:31     ` Valentin Schneider [this message]
2019-09-03  6:51 ` [dm-devel] " Christoph Hellwig
2019-09-03  7:13   ` Peter Zijlstra
2019-09-03 17:29 ` Valentin Schneider
2019-09-03 18:19   ` Alexey Dobriyan
2019-09-03 21:51     ` Valentin Schneider
2019-09-04 12:07       ` Valentin Schneider
2019-09-04 17:48         ` Valentin Schneider
2019-09-05 15:51         ` Markus Elfring
2019-09-05 16:52           ` Valentin Schneider
2019-09-23 10:26             ` Valentin Schneider
2019-09-23 10:34               ` Julia Lawall
2019-09-23 11:26                 ` Valentin Schneider
2019-09-23 11:43                   ` Julia Lawall
2019-09-23 13:23                     ` Valentin Schneider
2019-09-24  8:28                   ` Markus Elfring
2019-09-24  8:07               ` Markus Elfring
2019-09-04  9:43     ` [PATCH] " David Laight
2019-09-04 10:25       ` Valentin Schneider

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