svn commit: r210444 - head/sys/x86/x86

[Alexander Motin]

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();
 }