[Xen-devel] [PATCH 1 of 5] credit2: Add context_saved scheduler callback

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

2 files changed, 3 insertions(+)
xen/common/schedule.c      |    2 ++
xen/include/xen/sched-if.h |    1 +


Because credit2 shares a runqueue between several cpus, it needs
to know when a scheduled-out process has finally been context-switched
away so that it can be added to the runqueue again.  (Otherwise it may
be grabbed by another processor before the context has been properly
saved.)

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff -r c02cc832cb2d -r 2631707c54b3 xen/common/schedule.c
--- a/xen/common/schedule.c     Tue Apr 13 18:19:33 2010 +0100
+++ b/xen/common/schedule.c     Wed Apr 14 11:16:58 2010 +0100
@@ -923,6 +923,8 @@
     /* Check for migration request /after/ clearing running flag. */
     smp_mb();
 
+    SCHED_OP(context_saved, prev);
+
     if ( unlikely(test_bit(_VPF_migrating, &prev->pause_flags)) )
         vcpu_migrate(prev);
 }
diff -r c02cc832cb2d -r 2631707c54b3 xen/include/xen/sched-if.h
--- a/xen/include/xen/sched-if.h        Tue Apr 13 18:19:33 2010 +0100
+++ b/xen/include/xen/sched-if.h        Wed Apr 14 11:16:58 2010 +0100
@@ -70,6 +70,7 @@
 
     void         (*sleep)          (struct vcpu *);
     void         (*wake)           (struct vcpu *);
+    void         (*context_saved)  (struct vcpu *);
 
     struct task_slice (*do_schedule) (s_time_t);
 

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