linux-kernel - Re: [PATCH 2/2] tracing: Resize tgid_map to PID_MAX_LIMIT, not PID_MAX

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Message-ID: <20210630191145.64f526b0@rorschach.local.home>
Date:   Wed, 30 Jun 2021 19:11:45 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     Paul Burton <paulburton@...gle.com>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] tracing: Resize tgid_map to PID_MAX_LIMIT, not
 PID_MAX_DEFAULT

On Wed, 30 Jun 2021 18:34:11 -0400
Joel Fernandes <joelaf@...gle.com> wrote:

> > Anyway, I'll wait to hear what Joel says on this. If he thinks this is
> > worth 16M of memory when enabled, I may take it.  
> 
> I am not a huge fan of the 16M, in Android we enable this feature on
> all devices. Low end Android devices traced in the field are sometimes
> 1 GB and the added memory pressure may be unwelcome. Very least, maybe
> make it optional only for folks who increase pid_max?

Yeah, can we just set it to the size of pid_max, at whatever it is set
to?

-- Steve