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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-11-27 16:55:44 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-01-08 14:15:57 -0800
commit6d4b418c75a74eea1dd3701e106a9da8c335c451 (patch)
tree7ca38828ff65ade20dbe9390ae2749a6bec7a308 /kernel/rcutree.c
parentdc35c8934eba959b690921615fcd987e8bc17e4a (diff)
downloadop-kernel-dev-6d4b418c75a74eea1dd3701e106a9da8c335c451.zip
op-kernel-dev-6d4b418c75a74eea1dd3701e106a9da8c335c451.tar.gz
rcu: Trace callback acceleration
This commit adds event tracing for callback acceleration to allow better tracking of callbacks through the system. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.c')
-rw-r--r--kernel/rcutree.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index ac6a75d..e9dce4f 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1168,6 +1168,12 @@ static void rcu_accelerate_cbs(struct rcu_state *rsp, struct rcu_node *rnp,
rdp->nxttail[i] = rdp->nxttail[RCU_NEXT_TAIL];
rdp->nxtcompleted[i] = c;
}
+
+ /* Trace depending on how much we were able to accelerate. */
+ if (!*rdp->nxttail[RCU_WAIT_TAIL])
+ trace_rcu_grace_period(rsp->name, rdp->gpnum, "AccWaitCB");
+ else
+ trace_rcu_grace_period(rsp->name, rdp->gpnum, "AccReadyCB");
}
/*
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