linux-kernel - Re: [RFC PATCH 3/3] kernel tracing prototype

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Message-ID: <33307c790812050737l6a990685p619b32ac38f6491@mail.gmail.com>
Date:	Fri, 5 Dec 2008 07:37:48 -0800
From:	Martin Bligh <mbligh@...gle.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Jiaying Zhang <jiayingz@...gle.com>,
	Steven Rostedt <srostedt@...hat.com>,
	linux-kernel@...r.kernel.org, Michael Rubin <mrubin@...gle.com>,
	Michael Davidson <md@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 3/3] kernel tracing prototype

>> - vanilla 2.6.26 kernel, CONFIG_MARKERS=n
>> Throughput 759.352 MB/sec 4
>> - markers compiled in, tracing disabled
>> Throughput 754.18 MB/sec 4
>
> Is your kernel built with -freorder-blocks?  This option dramatically
> reduces the cost of inactive markers/tracepoints.

I'm curious why we wouldn't turn that on by default in the makefile?
At least if CONFIG_MARKERS is on.
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