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| author | Anoob Soman <anoob.soman@citrix.com> | 2017-06-07 12:46:56 +0100 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2017-06-13 15:30:27 +0200 |
| commit | c48f64ab472389df6f48171899c9d337adfadc5b (patch) | |
| tree | 5bd75e13eeea925c52dac81bc6c82fc8a2a72bdc /include/xen | |
| parent | 9cc91f212111cdcbefa02dcdb7dd443f224bf52c (diff) | |
| download | lwn-c48f64ab472389df6f48171899c9d337adfadc5b.tar.gz lwn-c48f64ab472389df6f48171899c9d337adfadc5b.zip | |
xen-evtchn: Bind dyn evtchn:qemu-dm interrupt to next online VCPU
A HVM domian booting generates around 200K (evtchn:qemu-dm xen-dyn)
interrupts,in a short period of time. All these evtchn:qemu-dm are bound
to VCPU 0, until irqbalance sees these IRQ and moves it to a different VCPU.
In one configuration, irqbalance runs every 10 seconds, which means
irqbalance doesn't get to see these burst of interrupts and doesn't
re-balance interrupts most of the time, making all evtchn:qemu-dm to be
processed by VCPU0. This cause VCPU0 to spend most of time processing
hardirq and very little time on softirq. Moreover, if dom0 kernel PREEMPTION
is disabled, VCPU0 never runs watchdog (process context), triggering a
softlockup detection code to panic.
Binding evtchn:qemu-dm to next online VCPU, will spread hardirq
processing evenly across different CPU. Later, irqbalance will try to balance
evtchn:qemu-dm, if required.
Signed-off-by: Anoob Soman <anoob.soman@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/events.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h index 88da2abaf535..f442ca5fcd82 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -58,6 +58,7 @@ void evtchn_put(unsigned int evtchn); void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector); void rebind_evtchn_irq(int evtchn, int irq); +int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu); static inline void notify_remote_via_evtchn(int port) { |