[Xen-changelog] [xen-unstable] credit2: Add context_saved scheduler callback

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1271243007 -3600
# Node ID 5cd44772fd21be0f88e5de813193a9918e805091
# Parent  ae08db793febf3a8da6cd74f38988d69d87d81a5
credit2: Add context_saved scheduler callback

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

diff -r ae08db793feb -r 5cd44772fd21 xen/common/schedule.c
--- a/xen/common/schedule.c     Wed Apr 14 11:56:54 2010 +0100
+++ b/xen/common/schedule.c     Wed Apr 14 12:03:27 2010 +0100
@@ -885,6 +885,8 @@ void context_saved(struct vcpu *prev)
     /* 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 ae08db793feb -r 5cd44772fd21 xen/include/xen/sched-if.h
--- a/xen/include/xen/sched-if.h        Wed Apr 14 11:56:54 2010 +0100
+++ b/xen/include/xen/sched-if.h        Wed Apr 14 12:03:27 2010 +0100
@@ -70,6 +70,7 @@ struct scheduler {
 
     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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