linux-kernel - Re: [PATCH 9/9] sched/psi: add PSI_IRQ to track IRQ/SOFTIRQ pressure

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Message-ID: <0a1f7ce7-2869-c189-3703-89bff2198874@bytedance.com>
Date:   Wed, 27 Jul 2022 23:09:53 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     surenb@...gle.com, mingo@...hat.com, peterz@...radead.org,
        tj@...nel.org, corbet@....net, akpm@...ux-foundation.org,
        rdunlap@...radead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, songmuchun@...edance.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH 9/9] sched/psi: add PSI_IRQ to track IRQ/SOFTIRQ pressure

On 2022/7/27 21:00, Johannes Weiner wrote:
> On Wed, Jul 27, 2022 at 07:28:37PM +0800, Chengming Zhou wrote:
>> On 2022/7/26 02:26, Johannes Weiner wrote:
>>> I think we can remove the NR_CPU task count, which frees up one
>>> u32. Something like the below diff should work (untested!)
>>
>> Hi, I tested ok, would you mind if I put this patch in this series?
>>
>> Subject: [PATCH] sched/psi: remove NR_ONCPU task accounting
>>
>> We put all fields updated by the scheduler in the first cacheline of
>> struct psi_group_cpu for performance.
>>
>> Since we want add another PSI_IRQ_FULL to track IRQ/SOFTIRQ pressure,
>> we need to reclaim space first. This patch remove NR_ONCPU task accounting
>> in struct psi_group_cpu, use TSK_ONCPU in state_mask to track instead.
> 
> Thanks for testing it, that sounds good.
> 
>> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
>> Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>
>> Tested-by: Chengming Zhou <zhouchengming@...edance.com>
> 
> Since you're handling the patch, you need to add your own
> Signed-off-by: as well. And keep From: Johannes (git commit --author).

Got it. Thanks!