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From: Steven Rostedt <rostedt@goodmis.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Clark Williams <williams@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH PREEMPT_RT] kcov:  fix locking splat from kcov_remote_start()
Date: Tue, 10 Aug 2021 15:14:28 -0400	[thread overview]
Message-ID: <20210810151428.3e02d386@oasis.local.home> (raw)
In-Reply-To: <20210810095032.epdhivjifjlmbhp5@linutronix.de>

On Tue, 10 Aug 2021 11:50:32 +0200
Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:

> - With lock kcov_remote_lock acquired there is a possible
>   hash_for_each_safe() and list_for_each() iteration. I don't know what
>   the limits are here but with a raw_spinlock_t it will contribute to
>   the maximal latency. 

Note, anyone having a kernel with KCOV compiled in, probably doesn't
care about latency ;-) It's like worrying about latency when lockdep is
complied in.

-- Steve

  reply	other threads:[~2021-08-10 19:14 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09 20:59 [PATCH PREEMPT_RT] kcov: fix locking splat from kcov_remote_start() Clark Williams
2021-08-10  9:42 ` Marco Elver
2021-08-10  9:50 ` Sebastian Andrzej Siewior
2021-08-10 19:14   ` Steven Rostedt [this message]
2021-08-10 20:38   ` Thomas Gleixner
2021-08-11  9:00     ` Sebastian Andrzej Siewior
2021-08-11 12:25       ` Thomas Gleixner

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