linux-kernel - RE: [PATCH 3/6] pstore: Add persistent function tracing

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Date:	Fri, 15 Jun 2012 22:00:57 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkhan@...il.com>,
	"arve@...roid.com" <arve@...roid.com>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Jesper Juhl <jj@...osbits.net>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marco Stornelli <marco.stornelli@...il.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"kernel-team@...roid.com" <kernel-team@...roid.com>
Subject: RE: [PATCH 3/6] pstore: Add persistent function tracing

> With function tracing the impact to performance is tremendous. Just
> recording two long words is a 130% hit to performance. Now multiply that
> to recording strings.

If pstore is writing to a flash based backend - then there will be many
milli-seconds of delay. I think the time taken to convert from binary to
ascii would be insignificant.

-Tony
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