From: David Laight <David.Laight@ACULAB.COM>
To: 'Steven Rostedt' <rostedt@goodmis.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: RE: ftrace not showing the process names for all processes on syscall events
Date: Mon, 30 Mar 2020 18:14:37 +0000 [thread overview]
Message-ID: <ffd8aa59d88146fbb5a4cb02ea9b7440@AcuMS.aculab.com> (raw)
In-Reply-To: <20200330140736.4b5f1667@gandalf.local.home>
From: Steven Rostedt
> Sent: 30 March 2020 19:08
> On Mon, 30 Mar 2020 15:34:08 +0000
> David Laight <David.Laight@ACULAB.COM> wrote:
>
> > Oh, does the 'function_graph' code ignore tail calls?
>
> Yes and no ;-) It works by dumb luck. As it was a year after function
> graph tracing was live (some time in 2010 I believe) that someone brought
> up tail calls, and I had to take a look at how it never crashed, and was
> surprised that it "just worked". Here's a summary:
'Dumb luck' seems to be failing me :-)
I'll look more closely tomorrow.
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2020-03-30 18:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 14:28 ftrace not showing the process names for all processes on syscall events David Laight
2020-03-30 15:08 ` Steven Rostedt
2020-03-30 15:34 ` David Laight
2020-03-30 18:07 ` Steven Rostedt
2020-03-30 18:14 ` David Laight [this message]
2020-03-30 18:39 ` Steven Rostedt
2020-04-01 14:37 ` David Laight
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