search for: create_periodic_tim

...clearly that time at the right bottom corner in my VM gets more slower and slower. I studied the bug deeply, and found something below. 2 Xen vmx_vmexit_handler --> ......... --> handle_rtc_io --> rtc_ioport_write --> rtc_timer_update --> set RTC's REG_A to a high rate--> create_periodic_time(disable the former timer, and init a new one) Win7 is installed in the vm. This calling path is executed so frequent that may come down to set the RTC's REG_A hundreds of times every second but with the same rate(976.562us(1024HZ)), it is so abnormal to me to see such behavior. 3 OS I have tr...

...d(hvm_domain_context tmict = vlapic_get_reg(s, APIC_TMICT); if (tmict > 0) { uint64_t period = APIC_BUS_CYCLE_NS * (uint32_t)tmict * s->hw.timer_divisor; - + uint32_t lvtt = vlapic_get_reg(s, APIC_LVTT); + + s->pt.irq = lvtt & APIC_VECTOR_MASK; create_periodic_time(v, &s->pt, period, s->pt.irq, vlapic_lvtt_period(s), NULL, s); printk("lapic_load to rearm the actimer:" "bus cycle is %uns, " - "saved tmict count %lu, period %"PRIu64"ns\...

..._reg(s, APIC_LVTT) & APIC_VECTOR_MASK; if ( (tmict = vlapic_get_reg(s, APIC_TMICT)) == 0 ) return; period = ((uint64_t)APIC_BUS_CYCLE_NS * (uint32_t)tmict * s->hw.timer_divisor); - s->pt.irq = vlapic_get_reg(s, APIC_LVTT) & APIC_VECTOR_MASK; create_periodic_time(vlapic_vcpu(s), &s->pt, period, vlapic_lvtt_period(s) ? period : 0, s->pt.irq, _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

Finally I got around to breaking up the similarly named monolithic patch that caused a regression shortly before the 4.2 release and got therefore reverted. This series consists of the broken up pieces that - according to my testing - don''t expose the reported lockup; the 7th will need debugging to understand what''s wrong there. 1: use RTC_* names instead of literal numbers 2:

Hi, When using lapic as timer source the hypervisor delivers timer interrupts late. In the source xen/arch/x86/hvm/vpt.c function create_periodic_time creates a timer element with a "bonus" of 50% of the desired time until the interrupt: pt->scheduled = NOW() + period; /* * Offset LAPIC ticks from other timer ticks. Otherwise guests which use * LAPIC ticks for process accounting can see long sequences of proce...

...power than before. The reason is two periodical vpts'' expires are hard to be aligned in the 50us soft timer SLOP. So we are considering a vpt specific enhancement which could try to just align periodical timers within vpt. A generic enhancement is to add a new interface like align_timer: (create_periodic_time) if ( period ) pt->scheduled = align_timer(NOW() + delta) ... set_timer(&pt->timer, pt->scheduled); Then align_timer tries to find another timer closest to expected expiration, and return to caller. This new interface only serves periodical timer, and just called once at creation...