linux-kernel - Re: [RFC] tracing: Improve design of preemptirq tracepoints and its users

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Date:   Mon, 5 Feb 2018 23:15:32 -0800
From:   Joel Fernandes <joelaf@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Joel Fernandes <joelaf@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zilstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [RFC] tracing: Improve design of preemptirq tracepoints and its users

On Mon, Feb 5, 2018 at 6:39 PM, Joel Fernandes <joelaf@...gle.com> wrote:
> This patch detaches the preemptirq tracepoints from the tracers and
> keeps it separate. With this, several ifdefs are cleaner, and lockdep
> and other users can use the preemptirq tracepoints by registering probes
> onto them. This makes it much cleaner, but not just that: PROVE_LOCKING
> and CONFIG_IRQSOFF_TRACER can be enabled now at the same time and we
> get rid of all the horrific ifdeferry around PROVE_LOCKING.
>

Sorry for the misstatement, irqsoff tracer and PROVE_LOCKING can still
be used at the same time (without this patch). I will correct the
commit message in the next rev. However this patch avoids the
complication that arises when enabling the 2 together, by eliminating
time_hardirqs_on/off.

thanks,

- Joel