linux-kernel - Re: [PATCH] tracing: Make the space reserved for the pid wider

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Message-ID: <20200915090520.2047abe8@gandalf.local.home>
Date:   Tue, 15 Sep 2020 09:05:20 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] tracing: Make the space reserved for the pid wider

On Tue, 15 Sep 2020 12:46:48 +0200
Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> On 2020-09-04 10:23:31 [+0200], To linux-kernel@...r.kernel.org wrote:
> > For 64bit CONFIG_BASE_SMALL=0 systems PID_MAX_LIMIT is set by default to
> > 4194304. During boot the kernel sets a new value based on number of CPUs
> > but no lower than 32768. It is 1024 per CPU so with 128 CPUs the default
> > becomes 131072 which needs six digits. 
> > This value can be increased during run time but must not exceed the
> > initial upper limit.
> > 
> > Systemd sometime after v241 sets it to the upper limit during boot. The
> > result is that when the pid exceeds five digits, the trace output is a
> > little hard to read because it is no longer properly padded (same like
> > on big iron with 98+ CPUs).
> > 
> > Increase the pid padding to seven digits.  
> 
> ping
> 

Hi Sebastian,

I'm still buried in email from my PTO, with lots of patches I need to
review and apply (or comment on). And I'm also behind in internal work
affairs. I'm not ignoring this, just taking some time to get to it :-/

-- Steve