linux-kernel - [PATCH v2 0/3] Lazy preemption leftovers

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Message-ID: <20241021151257.102296-1-bigeasy@linutronix.de>
Date: Mon, 21 Oct 2024 17:08:39 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
	tglx@...utronix.de,
	mingo@...nel.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	vschneid@...hat.com,
	ankur.a.arora@...cle.com,
	efault@....de,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [PATCH v2 0/3] Lazy preemption leftovers

This is a followup to PeterZ'
	https://lore.kernel.org/20241007074609.447006177@infradead.org

in PREEMPT_RT we had initially "LAZY preempt" this then morphed into
PREEMPT_AUTO and is becoming "Lazy preemption".
These are the tracing bits from that time that were used up to
PREEMPT_AUTO. With RT's RiscV support, they also contributed
PREEMPT_AUTO support which I just updated to current edition.

I used to have ARM* and POWERPC*, too support for the "LAZY preempt" but
this relied on assembly support and I dropped this during the switch to
PREEMPT_AUTO.

v1…v2 https://lore.kernel.org/all/20241009105709.887510-1-bigeasy@linutronix.de :
  - Added IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY) to
    tracing_gen_ctx_irq_test() to only record lazy flags if the
    architecture supports it (Ankur Arora).

  - Added a bit of Documentation for the additional context status
    (Shrikanth Hegde)

Sebastian