From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>,
Juergen Gross <jgross@suse.com>,
LKML <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Joel Fernandes <joel@joelfernandes.org>,
He Zhe <zhe.he@windriver.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Clark Williams <williams@redhat.com>
Subject: Re: [RFC][PATCH] tracing/x86: Save CR2 before tracing irqsoff on error_entry
Date: Thu, 21 Mar 2019 14:55:51 -0400 [thread overview]
Message-ID: <20190321145551.4c80c3a7@gandalf.local.home> (raw)
In-Reply-To: <20190321182830.GV5996@hirez.programming.kicks-ass.net>
On Thu, 21 Mar 2019 19:28:30 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, Mar 21, 2019 at 02:10:20PM -0400, Steven Rostedt wrote:
> > On Thu, 21 Mar 2019 11:05:06 -0700
> > Andy Lutomirski <luto@amacapital.net> wrote:
> >
> > > In the long run, I think the right solution is to rewrite even more of
> > > this mess in C. We really ought to be able to put the IRQ flag
> > > tracing and the context tracking into C code.
> >
> > And once we do that, we can work on getting the irq tracing
> > incorporated into a jump_label type that we could possibly enable
> > lockdep at start up, and then disable it later, even on production
> > systems! That is, to be able to turn it off and bring the system back
> > up to full speed.
>
> You forget the stupid amount of data bloat that lockdep brings.
No I didn't. Some users only care about performance, but find memory
cheap.
-- Steve
next prev parent reply other threads:[~2019-03-21 18:55 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 2:15 [RFC][PATCH] tracing/x86: Save CR2 before tracing irqsoff on error_entry Steven Rostedt
2019-03-21 8:33 ` Peter Zijlstra
2019-03-21 9:02 ` Peter Zijlstra
2019-03-21 10:45 ` Peter Zijlstra
2019-03-21 13:32 ` Steven Rostedt
2019-03-21 13:55 ` Steven Rostedt
2019-03-21 17:23 ` Linus Torvalds
2019-03-21 17:22 ` Peter Zijlstra
2019-03-21 18:05 ` Andy Lutomirski
2019-03-21 18:10 ` Steven Rostedt
2019-03-21 18:27 ` Andy Lutomirski
2019-03-21 20:50 ` Peter Zijlstra
2019-03-22 2:52 ` Andy Lutomirski
2019-03-21 18:28 ` Peter Zijlstra
2019-03-21 18:55 ` Steven Rostedt [this message]
2019-03-21 19:31 ` Peter Zijlstra
2019-03-21 19:50 ` Steven Rostedt
2019-03-21 20:03 ` Peter Zijlstra
2019-03-21 20:11 ` Steven Rostedt
2019-03-21 18:18 ` Linus Torvalds
2019-03-21 18:20 ` Andy Lutomirski
2019-03-21 18:25 ` Linus Torvalds
2019-03-21 18:37 ` Peter Zijlstra
2019-03-21 18:39 ` Andy Lutomirski
2019-03-21 20:00 ` Andrew Cooper
2019-03-21 20:35 ` Steven Rostedt
2019-03-21 18:38 ` Andy Lutomirski
2019-03-21 18:42 ` Peter Zijlstra
2019-03-21 18:22 ` hpa
2019-03-22 5:54 ` Juergen Gross
2019-03-21 18:27 ` Peter Zijlstra
2019-03-21 18:28 ` Andy Lutomirski
2019-03-21 18:33 ` Peter Zijlstra
2019-03-21 13:04 ` Steven Rostedt
2019-04-17 1:52 ` He Zhe
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