linux-kernel - RE: ftrace not showing the process names for all processes on syscall events

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Message-ID: <ffd8aa59d88146fbb5a4cb02ea9b7440@AcuMS.aculab.com>
Date:   Mon, 30 Mar 2020 18:14:37 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Steven Rostedt' <rostedt@...dmis.org>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: ftrace not showing the process names for all processes on syscall
 events

From: Steven Rostedt
> Sent: 30 March 2020 19:08
> On Mon, 30 Mar 2020 15:34:08 +0000
> David Laight <David.Laight@...LAB.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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