>-----Original Message----- >From: linux-kernel-owner@xxxxxxxxxxxxxxx >[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of >Thomas Gleixner >Sent: Monday, October 01, 2007 11:19 PM >To: Andi Kleen >Cc: Arjan van de Ven; David Bahi; LKML; >linux-rt-users@xxxxxxxxxxxxxxx; Andrew Morton; Ingo Molnar; >Gregory Haskins >Subject: Re: nmi_watchdog fix for x86_64 to be more like i386 > >> >> The only workaround for chipsets ignoring IRQ affinity would >be to keep >> track on which CPU irq 0 happens and then restart APIC timer >interrupts >> on the others (or send IPIs) as needed. But that would be >fairly ugly. > >The clock events code does handle this already. The broadcast >interrupt >can come in on any cpu. It's just the nmi watchdog which would >be affected >by that. > Probably we can workaround this by keeping track of IRQ0 count at percpu level and use local apic timer + this percpu counter in NMI. Or just increment local apic timer count in IRQ0 with nohz enabled. Thanks, Venki - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
