Author: mav
Date: Sat Jul 24 10:49:59 2010
New Revision: 210444
URL: http://svn.freebsd.org/changeset/base/210444
Log:
Increment td->td_intr_nesting_level for LAPIC timer interrupts. Among other
things it hints SCHED_ULE to run clock swi handlers on their native CPUs,
avoiding many unneeded IPI_PREEMPT calls.
Modified:
head/sys/x86/x86/local_apic.c
Modified: head/sys/x86/x86/local_apic.c
==============================================================================
--- head/sys/x86/x86/local_apic.c Sat Jul 24 10:07:17 2010
(r210443)
+++ head/sys/x86/x86/local_apic.c Sat Jul 24 10:49:59 2010
(r210444)
@@ -811,10 +811,12 @@ lapic_handle_timer(struct trapframe *fra
critical_enter();
if (lapic_et.et_active) {
td = curthread;
+ td->td_intr_nesting_level++;
oldframe = td->td_intr_frame;
td->td_intr_frame = frame;
lapic_et.et_event_cb(&lapic_et, lapic_et.et_arg);
td->td_intr_frame = oldframe;
+ td->td_intr_nesting_level--;
}
critical_exit();
}
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