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

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Message-ID: <87bjztaz7e.fsf@oracle.com>
Date: Wed, 09 Oct 2024 11:49:41 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Ankur Arora <ankur.a.arora@...cle.com>,
        Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>,
        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, efault@....de,
        Masami Hiramatsu
 <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH 2/3] tracing: Record task flag NEED_RESCHED_LAZY.


Steven Rostedt <rostedt@...dmis.org> writes:

> On Wed, 09 Oct 2024 10:30:28 -0700
> Ankur Arora <ankur.a.arora@...cle.com> wrote:
>
>> > +++ b/kernel/trace/trace.c
>> > @@ -2544,6 +2544,8 @@ unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
>> >  		trace_flags |= TRACE_FLAG_NEED_RESCHED;
>> >  	if (test_preempt_need_resched())
>> >  		trace_flags |= TRACE_FLAG_PREEMPT_RESCHED;
>> > +	if (tif_test_bit(TIF_NEED_RESCHED_LAZY))
>>
>> TIF_NEED_RESCHED_LAZY falls back to TIF_NEED_RESCHED without
>> CONFIG_ARCH_HAS_PREEMPT_LAZY. So, you might need to add an explicit
>> check for that as well.
>>
>> With that,
>>  Reviewed-by: Ankur Arora <ankur.a.arora@...cle.com>
>>
>> Ankur
>>
>
> So this should be:
>
> 	if (IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY) &&
> 	    tif_test_bit(TIF_NEED_RESCHED_LAZY))
>
> ?

Yeah, exactly that.

--
ankur