Re: [RFC PATCH 38/86] sched: *_tsk_need_resched() now takes resched_t

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To: Ankur Arora <ankur.a.arora@xxxxxxxxxx>
Subject: Re: [RFC PATCH 38/86] sched: *_tsk_need_resched() now takes resched_t
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 8 Nov 2023 10:03:33 +0100
Cc: linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, paulmck@xxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, luto@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, mingo@xxxxxxxxxx, juri.lelli@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, willy@xxxxxxxxxxxxx, mgorman@xxxxxxx, jon.grimm@xxxxxxx, bharata@xxxxxxx, raghavendra.kt@xxxxxxx, boris.ostrovsky@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx, jgross@xxxxxxxx, andrew.cooper3@xxxxxxxxxx, mingo@xxxxxxxxxx, bristot@xxxxxxxxxx, mathieu.desnoyers@xxxxxxxxxxxx, geert@xxxxxxxxxxxxxx, glaubitz@xxxxxxxxxxxxxxxxxxx, anton.ivanov@xxxxxxxxxxxxxxxxxx, mattst88@xxxxxxxxx, krypton@xxxxxxxxxxxxxxxxxxx, rostedt@xxxxxxxxxxx, David.Laight@xxxxxxxxxx, richard@xxxxxx, mjguzik@xxxxxxxxx
In-reply-to: <20231107215742.363031-39-ankur.a.arora@oracle.com>
References: <20231107215742.363031-1-ankur.a.arora@oracle.com> <20231107215742.363031-39-ankur.a.arora@oracle.com>

On Tue, Nov 07, 2023 at 01:57:24PM -0800, Ankur Arora wrote:
> *_tsk_need_resched() need to test for the specific need-resched
> flag.
> 
> The only users are RCU and the scheduler. For RCU we always want
> to schedule at the earliest opportunity and that is always
> RESCHED_eager.

Why ?

> 
> For the scheduler, keep everything as RESCHED_eager for now.

Why ?

References:
- [RFC PATCH 00/86] Make the kernel preemptible
  - From: Ankur Arora
- [RFC PATCH 38/86] sched: *_tsk_need_resched() now takes resched_t
  - From: Ankur Arora

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