linux-kernel - Re: [PATCH v2 7/9] sched: define TIF_ALLOW

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Message-ID: <ZQlL//7xWPlaykpa@gmail.com>
Date:   Tue, 19 Sep 2023 09:21:35 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        willy@...radead.org, mgorman@...e.de, rostedt@...dmis.org,
        jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        jgross@...e.com, andrew.cooper3@...rix.com
Subject: Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED


* Thomas Gleixner <tglx@...utronix.de> wrote:

> Additionally we have PREEMPT=FULL which utilizes every zero transition
> of preeempt_count as a potential preemption point.

Just to complete this nice new entry to Documentation/sched/: in 
PREEMPT=FULL there's also IRQ-return driven preemption of kernel-mode code, 
at almost any instruction boundary the hardware allows, in addition to the 
preemption driven by regular zero transition of preempt_count in 
syscall/kthread code.

Thanks,

	Ingo