linux-kernel - Re: Unified tracing buffer

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Message-Id: <20080919144258.ac787fdf.randy.dunlap@oracle.com>
Date:	Fri, 19 Sep 2008 14:42:58 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Martin Bligh" <mbligh@...gle.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Mathieu Desnoyers" <compudj@...stal.dyndns.org>,
	"Steven Rostedt" <rostedt@...dmis.org>, od@...ell.com,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: Unified tracing buffer

On Fri, 19 Sep 2008 14:33:42 -0700 Martin Bligh wrote:

> STORAGE
> -------
> 
> We will support multiple buffers for different tracing systems, with
> separate names, event id spaces.
> Event ids are 16 bit, dynamically allocated.

What are these (like)?

> A "one line of text" print function will be provided for each event,
> or use the default (probably hex printf)
> Will provide a "flight data recorder" mode, and a "spool to disk" mode.
> 
> Circular buffer per cpu, protected by per-cpu spinlock_irq
> Word aligned records.

Arch-specific "word"?
or some fixed-size-for-all-systems (so that trace buffers can be
shared/used on other systems?)  Preferably the latter.


> Variable record length, header will start with length record.
> Timestamps in fixed timebase, monotonically increasing (across all CPUs)

what timestamp resolution?


---
~Randy
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