From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Tue, 10 May 2005 18:26:17 +0000 Subject: Re: KDB improvements for IA64 Message-Id: <17024.64713.827619.735000@napali.hpl.hp.com> List-Id: References: <4280D2C5.3060604@bull.net> In-Reply-To: <4280D2C5.3060604@bull.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Tue, 10 May 2005 17:27:01 +0200, Francois Wellenreiter said: Francois> - timeouts when exiting from KDB will never occur I have Francois> noticed that after a long time in KDB, some drivers enter Francois> in timeout sequences. Now, the different ITC values are Francois> saved when entering KDB and restored when going out. This sounds fragile to me. For one thing, the kernel may not use ITC at all for timeouts (true for most NUMA platforms). Also, even if the ITC is in use, you'd probably have to resync them on the slave CPUs after restoring the time-keeper's ITC value. Not to mention that if the timeout is related to an external event, then faking time won't help no matter what. --david