From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Benjamin King <benjaminking@web.de>
Cc: linux-perf-users <linux-perf-users@vger.kernel.org>
Subject: Re: Re: perf tracepoints for regular user?
Date: Thu, 21 Jan 2016 11:05:05 -0300 [thread overview]
Message-ID: <20160121140505.GB2312@kernel.org> (raw)
In-Reply-To: <trinity-4241dafc-74f5-4560-80af-3b9ba8eefece-1453290633763@3capp-webde-bs16>
Em Wed, Jan 20, 2016 at 12:50:33PM +0100, Benjamin King escreveu:
> Hi Arnaldo,
>
> > > $ sudo mount -o remount,mode=755 /sys/kernel/debug/tracing
> > > mount: can't find /sys/kernel/debug/tracing in /etc/fstab
> > > $ mount|grep debug
> > > none on /sys/kernel/debug type debugfs (rw,mode=755,mode=755)
> >
> > Ok, your kernel is old and doesn't have the tracefs:
Not having tracefs, if that is indeed the case, only means that the
remount isn't needed, as what is in tracefs is what, before its
existence, lived in a debugfs directory, /sys/kernel/debug/tracing, i.e.
remounting just /sys/kernel/debug/ would then be enough.
> > [acme@zoo ~]$ mount | egrep \(debug\|trace\)fs
> > debugfs on /sys/kernel/debug type debugfs (rw,relatime,seclabel,mode=755)
> > tracefs on /sys/kernel/debug/tracing type tracefs (rw,relatime,mode=755)
> > [...]
> > [acme@zoo ~]$ uname -r
> > 4.3.0+
> That's odd. According to kernelnewbies.org (Yes, I am that much of a
> kernel hacker :-) ), tracefs should be in since 4.1 and I'm on 4.2,
> but I can only find CONFIG_DEBUG_FS in my kernel configuration. There
> is no mentioning of a corresponding CONFIG_TRACE_FS there.
> I'll try to upgrade to a more recent kernel and stop bugging you guys until then.
next prev parent reply other threads:[~2016-01-21 14:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-15 21:05 perf tracepoints for regular user? Benjamin King
2016-01-17 21:20 ` Milian Wolff
2016-01-17 21:56 ` Milian Wolff
2016-01-19 5:02 ` Benjamin King
2016-01-19 22:18 ` Arnaldo Carvalho de Melo
2016-01-20 11:50 ` Aw: " Benjamin King
2016-01-21 14:05 ` Arnaldo Carvalho de Melo [this message]
2016-01-25 15:43 ` Benjamin King
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