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From: Mark Rutland <mark.rutland@arm.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	keescook@chromium.org, jannh@google.com,
	linux-kernel@vger.kernel.org, vcaputo@pengaru.com,
	mingo@redhat.com, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
	bristot@redhat.com, akpm@linux-foundation.org,
	christian.brauner@ubuntu.com, amistry@google.com,
	Kenta.Tada@sony.com, legion@kernel.org,
	michael.weiss@aisec.fraunhofer.de, mhocko@suse.com,
	deller@gmx.de, zhengqi.arch@bytedance.com, me@tobin.cc,
	tycho@tycho.pizza, tglx@linutronix.de, bp@alien8.de,
	hpa@zytor.com, axboe@kernel.dk, metze@samba.org,
	laijs@linux.alibaba.com, luto@kernel.org,
	dave.hansen@linux.intel.com, ebiederm@xmission.com,
	ohoono.kwon@samsung.com, kaleshsingh@google.com,
	yifeifz2@illinois.edu, linux-hardening@vger.kernel.org,
	linux-arch@vger.kernel.org, vgupta@kernel.org,
	linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org,
	bcain@codeaurora.org, monstr@monstr.eu,
	tsbogend@alpha.franken.de, nickhu@andestech.com,
	jonas@southpole.se, mpe@ellerman.id.au, paul.walmsley@sifive.com,
	hca@linux.ibm.com, ysato@users.sourceforge.jp,
	davem@davemloft.net, chris@zankel.net
Subject: Re: [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT
Date: Thu, 14 Oct 2021 19:07:38 +0100	[thread overview]
Message-ID: <20211014180738.GC39276@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <20211008161707.i3cwz6qukgcf4frj@treble>

On Fri, Oct 08, 2021 at 09:17:07AM -0700, Josh Poimboeuf wrote:
> On Fri, Oct 08, 2021 at 03:45:59PM +0200, Peter Zijlstra wrote:
> > > stack_trace_save_tsk() *shouldn't* skip anything unless we've explicitly
> > > told it to via skipnr, because I'd expect that
> > 
> > It's what most archs happen to do today and is what
> > stack_trace_save_tsk() as implemented using arch_stack_walk() does.
> > Which is I think the closest to canonical we have.

Ah; and arch_stack_walk() itself shouldn't skip anything, which gives
the consistent low-level semantic I wanted.

> It *is* confusing though.  Even if 'nosched' may be the normally
> desired behavior, stack_trace_save_tsk() should probably be named
> stack_trace_save_tsk_nosched().

I agree that'd be less confusing!

Josh, am I right in my understanding that the reliable stacktrace
functions *shouldn't* skip sched functions, or should those similarly
gain a _nosched suffix?

Thanks,
Mark.

  reply	other threads:[~2021-10-14 18:08 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 11:15 [PATCH 0/7] wchan: Fix wchan support Peter Zijlstra
2021-10-08 11:15 ` [PATCH 1/7] Revert "proc/wchan: use printk format instead of lookup_symbol_name()" Peter Zijlstra
2021-10-15  9:45   ` [tip: sched/core] " tip-bot2 for Kees Cook
2021-10-08 11:15 ` [PATCH 2/7] leaking_addresses: Always print a trailing newline Peter Zijlstra
2021-10-15  9:45   ` [tip: sched/core] " tip-bot2 for Kees Cook
2021-10-08 11:15 ` [PATCH 3/7] proc: Use task_is_running() for wchan in /proc/$pid/stat Peter Zijlstra
2021-10-15  9:45   ` [tip: sched/core] " tip-bot2 for Kees Cook
2021-10-08 11:15 ` [PATCH 4/7] x86: Fix get_wchan() to support the ORC unwinder Peter Zijlstra
2021-10-15  9:45   ` [tip: sched/core] " tip-bot2 for Qi Zheng
2021-10-08 11:15 ` [PATCH 5/7] sched: Add wrapper for get_wchan() to keep task blocked Peter Zijlstra
2021-10-08 11:26   ` Geert Uytterhoeven
2021-10-08 12:45   ` Mark Rutland
2021-10-14 10:46   ` Russell King (Oracle)
2021-10-15  9:45   ` [tip: sched/core] " tip-bot2 for Kees Cook
2021-10-08 11:15 ` [PATCH 6/7] arch: __get_wchan || STACKTRACE_SUPPORT Peter Zijlstra
2021-10-08 12:40   ` Mark Rutland
2021-10-08 13:45     ` Peter Zijlstra
2021-10-08 16:17       ` Josh Poimboeuf
2021-10-14 18:07         ` Mark Rutland [this message]
2021-10-14 18:41           ` Josh Poimboeuf
2021-10-14 18:03       ` Mark Rutland
2021-10-14 18:48         ` Josh Poimboeuf
2021-10-14 11:07   ` Russell King (Oracle)
2021-10-08 11:15 ` [PATCH 7/7] arch: Fix STACKTRACE_SUPPORT Peter Zijlstra
2021-10-08 12:52   ` Mark Rutland
2021-10-09  9:36   ` Guo Ren
2021-10-14 12:02 ` [PATCH 0/7] wchan: Fix wchan support Russell King (Oracle)
2021-10-14 13:38   ` Russell King (Oracle)
2021-10-14 19:51     ` Josh Poimboeuf

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