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From: Steven Rostedt <rostedt@goodmis.org>
To: Brian Norris <briannorris@chromium.org>
Cc: linux-wireless <linux-wireless@vger.kernel.org>,
	ath10k <ath10k@lists.infradead.org>,
	Wen Gong <wgong@codeaurora.org>
Subject: Re: [PATCH] ath10k: change len of trace_ath10k_log_dbg_dump for large buffer size
Date: Tue, 9 Feb 2021 16:34:31 -0500	[thread overview]
Message-ID: <20210209163431.11133472@gandalf.local.home> (raw)
In-Reply-To: <20210209145531.5977b16d@gandalf.local.home>

On Tue, 9 Feb 2021 14:55:31 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> > [for-next][PATCH 2/2] tracing: Use temp buffer when filtering events
> > https://lore.kernel.org/lkml/f16b14066317f6a926b6636df6974966@codeaurora.org/  
> 
> Note, that is only used when filtering happens, which doesn't appear to be
> the case here.

I was basing this off of the original commands, but the stack dump says
otherwise. But it should still work.

> 
> > 
> > It seems like we should still try to get that fixed somehow, even if
> > the below change is fine on its own (it probably doesn't make sense to
> > such a large amount of data via tracepoints). It would be unfortunate
> > for next poor soul to hit the same issues, just because they wanted to
> > dump a few KB.  
> 
> Yeah, it was a design decision to cap the max size of events to just under
> PAGE_SIZE. The ring buffer is broken up into pages (for zero copy
> transfers to file systems and the network). Thus, no event is allowed to be
> bigger than a page (and actually a bit smaller)
> 
> That said, it shouldn't have crashed, it should have just failed to record.
> 
> I'll test it out and see why it crashed.

Looking at the original report, I see:

 CPU: 1 PID: 141 Comm: kworker/u16:1 Not tainted 4.19.139 #162

Does this still crash on the latest kernel?

-- Steve

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  reply	other threads:[~2021-02-09 21:35 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  2:59 Wen Gong
2021-02-09  7:34 ` Kalle Valo
2021-02-09 19:35 ` Brian Norris
2021-02-09 19:55   ` Steven Rostedt
2021-02-09 21:34     ` Steven Rostedt [this message]
2021-02-10  2:01       ` Wen Gong
2021-02-10 16:30         ` Steven Rostedt
2021-02-10 16:48           ` Steven Rostedt
2021-02-10 16:53             ` Steven Rostedt
2021-03-08  7:22               ` Wen Gong
2021-02-10  2:11   ` Wen Gong
2021-02-10  2:14     ` Brian Norris
2021-02-10  2:24       ` Wen Gong

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