linux-kernel - Re: [PATCH 0/7] arch: More wchan fixes

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Message-ID: <20211022152738.GC174703@worktop.programming.kicks-ass.net>
Date:   Fri, 22 Oct 2021 17:27:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     keescook@...omium.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, akpm@...ux-foundation.org,
        mark.rutland@....com, zhengqi.arch@...edance.com,
        linux@...linux.org.uk, catalin.marinas@....com, will@...nel.org,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, borntraeger@...ibm.com,
        linux-arch@...r.kernel.org, ardb@...nel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 0/7] arch: More wchan fixes


*sigh*,...

On Fri, Oct 22, 2021 at 05:09:33PM +0200, Peter Zijlstra wrote:
> Hi,
> 
> Respin of the rest of the get_wchan() rework [1]. Given the many problems with
> STACKTRACE this series focuses on the newer ARCH_STACKWALK since that's a
> smaller set of architectures to review with a better specified interface.
> 
> The idea is to piece-wise convert the rest of the architectures to
> ARCH_STACKWALK, but that can be done at leasure.
> 
> PowerPC and ARM64 are a bit funny in that their __switch_to() is in C and ends
> up on the stack. For now simply mark it __sched to make it work. Mark wanted to
> maybe do something different, but I think this ought to get us started.


[1] https://lkml.kernel.org/r/20211008111527.438276127@infradead.org

Patches are also available at:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wchan