linux-kernel - Re: [PATCH tip/core/rcu 0/4] Programmatic nestable expedited grace periods

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Message-ID: <54EA207E.3090502@linux.intel.com>
Date:	Sun, 22 Feb 2015 10:31:26 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Josh Triplett <josh@...htriplett.org>
CC:	paulmck@...ux.vnet.ibm.com, Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	tglx@...utronix.de, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 0/4] Programmatic nestable expedited grace
 periods

>>
>> To show the boot time, I'm using the timestamp of the "Write protecting" line,
>> that's pretty much the last thing we print prior to ring 3 execution.
>
> That's a little sad; we ought to be write-protecting kernel read-only
> data as *early* as possible.

well... if you are compromised before the first ring 3 instruction...
.... you have a slightly bigger problem than where in the kernel we write protect things.


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