linux-kernel - Re: [PATCH v2 11/11] lockdep,trace: Expose tracepoints

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Message-ID: <20200903141310.GY35926@hirez.programming.kicks-ass.net>
Date:   Thu, 3 Sep 2020 16:13:10 +0200
From:   peterz@...radead.org
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org, will@...nel.org,
        npiggin@...il.com, elver@...gle.com, jgross@...e.com,
        paulmck@...nel.org, rostedt@...dmis.org, rjw@...ysocki.net,
        joel@...lfernandes.org, svens@...ux.ibm.com, tglx@...utronix.de,
        ulf.hansson@...aro.org, viresh.kumar@...aro.org,
        vincent.guittot@...aro.org
Subject: Re: [PATCH v2 11/11] lockdep,trace: Expose tracepoints

On Thu, Sep 03, 2020 at 04:00:47PM +0200, peterz@...radead.org wrote:
> I stuck a tracepoint in intel_idle and had a rummage around. The below
> seems to work for me now.

Note that this will insta-kill all trace_*_rcuidle() tracepoint that are
actually used in rcuidle.

A git-grep seems to suggest the remaining users are:

 - arch/arm
 - arch/arm64 -- IPI tracepoint that are ordered incorrectly in
                 their entry code,

 - runtime pm
 - common clk -- these both need re-ordering somehow

 - trace_preemptirq -- this is going to be interesting for
                       those archs that idle with IRQs enabled

 - printk -- we shouldn't be printk()-ing from idle, and if we are,
             missing this is the least of our problems.