[Xen-changelog] [xen master] credit2: performance counter for load balancing call

[patchbot@xxxxxxx]

commit d5c4a55e007db102ee6bd1ac771f0b05458609c2
Author:     Praveen Kumar <kpraveen.lkml@xxxxxxxxx>
AuthorDate: Wed Jan 25 10:51:47 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jan 25 10:51:47 2017 +0100

    credit2: performance counter for load balancing call
    
    The patch introduces a new performance counter that counts how many times 
we go
    through the load balancing logic in Credit2.
    
    Signed-off-by: Praveen Kumar <kpraveen.lkml@xxxxxxxxx>
    Acked-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
---
 xen/common/sched_credit2.c   | 2 ++
 xen/include/xen/perfc_defn.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
index 2ce738d..b2f2b17 100644
--- a/xen/common/sched_credit2.c
+++ b/xen/common/sched_credit2.c
@@ -1887,6 +1887,8 @@ retry:
                     (unsigned char *)&d);
     }
 
+    SCHED_STAT_CRANK(acct_load_balance);
+
     /* Look for "swap" which gives the best load average
      * FIXME: O(n^2)! */
 
diff --git a/xen/include/xen/perfc_defn.h b/xen/include/xen/perfc_defn.h
index 900fddd..0d702f0 100644
--- a/xen/include/xen/perfc_defn.h
+++ b/xen/include/xen/perfc_defn.h
@@ -57,6 +57,7 @@ PERFCOUNTER(vcpu_hot,               "csched: vcpu_hot")
 
 /* credit2 specific counters */
 PERFCOUNTER(burn_credits_t2c,       "csched2: burn_credits_t2c")
+PERFCOUNTER(acct_load_balance,      "csched2: acct_load_balance")
 PERFCOUNTER(upd_max_weight_quick,   "csched2: update_max_weight_quick")
 PERFCOUNTER(upd_max_weight_full,    "csched2: update_max_weight_full")
 PERFCOUNTER(migrate_requested,      "csched2: migrate_requested")
--
generated by git-patchbot for /home/xen/git/xen.git#master

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