From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erich Focht Date: Mon, 21 Jan 2002 18:24:08 +0000 Subject: Re: [Linux-ia64] Help with Ingo scheduler on IA64 Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Please ignore my previous email. The interrupt can of course come from within the context_switch() part in schedule(), where psr.i is set. Unfortunately the context switch in Ingo's scheduler happens with the runqueue lock held, which can lead to a deadlock eg. if the timer interrupt is called inside and sched_tick spinlocks on the runqueue lock held by schedule(). On IA64 (HZ24) this probably happens much more frequently than on IA32 (HZ0). Regards, Erich On Sat, 19 Jan 2002, David Mosberger wrote: > psr.i *does* disable all interrupts, including NMI. Device interrupts > are generally referred to as "external interrupts" in the ia64 > manuals. If you read the manual, you'll find there is no ambiguity > about this at all. For example, see Table 5-8: External Interrupt > Control Registers; it lists ITV... > > --david