linux-kernel - Re: [RFC][PATCH] ring-buffer: Have nested events still record running time stamp

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Message-ID: <581134894.13457.1593115410860.JavaMail.zimbra@efficios.com>
Date:   Thu, 25 Jun 2020 16:03:30 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     rostedt <rostedt@...dmis.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Yordan Karadzhov <y.karadz@...il.com>,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Jason Behmer <jbehmer@...gle.com>,
        Julia Lawall <julia.lawall@...ia.fr>,
        Clark Williams <williams@...hat.com>,
        bristot <bristot@...hat.com>, Daniel Wagner <wagi@...om.org>,
        Darren Hart <dvhart@...are.com>,
        Jonathan Corbet <corbet@....net>,
        "Suresh E. Warrier" <warrier@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH] ring-buffer: Have nested events still record
 running time stamp

----- On Jun 25, 2020, at 3:09 PM, rostedt rostedt@...dmis.org wrote:

> On Thu, 25 Jun 2020 13:55:07 -0400 (EDT)
> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> 
>> What are the types used for before_stamp and write_stamp ? If those
>> are 64-bit integers, how does sharing them between nested contexts
>> work on 32-bit architectures ?
> 
> BTW, I forgot to state in either of my two emails, THANK YOU!
> 
> I really appreciate the thorough review of this patch, and I welcome
> the challenges you give me to make sure I can verify all that I claim
> can happen.

You're welcome! I believe these discussions we've been having for the past
10+ years on ring buffer design have helped improve our respective projects.

I'm glad to be of service!

Thanks,

Mathieu


-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com