linux-kernel - Re: [PATCH v2 2/3] tracing: Record task flag NEED_RESCHED

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Message-ID: <20241022072644.Tw-k3d95@linutronix.de>
Date: Tue, 22 Oct 2024 09:26:44 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
	mingo@...nel.org, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, 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: Re: [PATCH v2 2/3] tracing: Record task flag NEED_RESCHED_LAZY.

On 2024-10-22 03:18:27 [-0400], Steven Rostedt wrote:
> On Mon, 21 Oct 2024 17:08:41 +0200
> Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> >  enum trace_flag_type {
> >  	TRACE_FLAG_IRQS_OFF		= 0x01,
> >  	TRACE_FLAG_NEED_RESCHED		= 0x02,
> > +	TRACE_FLAG_NEED_RESCHED_LAZY	= 0x04,
> >  	TRACE_FLAG_HARDIRQ		= 0x08,
> >  	TRACE_FLAG_SOFTIRQ		= 0x10,
> >  	TRACE_FLAG_PREEMPT_RESCHED	= 0x20,
> 
> As I stated in the other email, these are user visible. Should probably
> make the LAZY flag 0x100, as the trace_flags are 16 bits worth.

What about struct trace_entry? That flags is stored as 8bit in
tracing_generic_entry_update().

> 
> -- Steve

Sebastian