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rcu: Add RCU type to callback-invocation tracing 

Add a string to the rcu_batch_start() and rcu_batch_end() trace
messages that indicates the RCU type ("rcu_sched", "rcu_bh", or
"rcu_preempt").  The trace messages for the actual invocations
themselves are not marked, as it should be clear from the
rcu_batch_start() and rcu_batch_end() events before and after.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-06-21 01:14:54 -07:00 committed by Paul E. McKenney
parent e99033c5c1
commit 72fe701b70
3 changed files with 26 additions and 18 deletions
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28
include/trace/events/rcu.h
View File

@ -33,27 +33,31 @@ TRACE_EVENT(rcu_utilization,
/*
* Tracepoint for marking the beginning rcu_do_batch, performed to start
* RCU callback invocation. The first argument is the total number of
* callbacks (including those that are not yet ready to be invoked),
* and the second argument is the current RCU-callback batch limit.
* RCU callback invocation. The first argument is the RCU flavor,
* the second is the total number of callbacks (including those that
* are not yet ready to be invoked), and the third argument is the
* current RCU-callback batch limit.
*/
TRACE_EVENT(rcu_batch_start,
TP_PROTO(long qlen, int blimit),
TP_PROTO(char *rcuname, long qlen, int blimit),
TP_ARGS(qlen, blimit),
TP_ARGS(rcuname, qlen, blimit),
TP_STRUCT__entry(
__field(char *, rcuname)
__field(long, qlen)
__field(int, blimit)
),
TP_fast_assign(
__entry->rcuname = rcuname;
__entry->qlen = qlen;
__entry->blimit = blimit;
),
TP_printk("CBs=%ld bl=%d", __entry->qlen, __entry->blimit)
TP_printk("%s CBs=%ld bl=%d",
__entry->rcuname, __entry->qlen, __entry->blimit)
);
/*
@ -106,23 +110,27 @@ TRACE_EVENT(rcu_invoke_kfree_callback,
/*
* Tracepoint for exiting rcu_do_batch after RCU callbacks have been
* invoked. The first argument is the number of callbacks actually invoked.
* invoked. The first argument is the name of the RCU flavor and
* the second argument is number of callbacks actually invoked.
*/
TRACE_EVENT(rcu_batch_end,
TP_PROTO(int callbacks_invoked),
TP_PROTO(char *rcuname, int callbacks_invoked),
TP_ARGS(callbacks_invoked),
TP_ARGS(rcuname, callbacks_invoked),
TP_STRUCT__entry(
__field(char *, rcuname)
__field(int, callbacks_invoked)
),
TP_fast_assign(
__entry->rcuname = rcuname;
__entry->callbacks_invoked = callbacks_invoked;
),
TP_printk("CBs-invoked=%d", __entry->callbacks_invoked)
TP_printk("%s CBs-invoked=%d",
__entry->rcuname, __entry->callbacks_invoked)
);
#endif /* _TRACE_RCU_H */

8
kernel/rcutiny.c
View File

@ -168,14 +168,14 @@ static void rcu_process_callbacks(struct rcu_ctrlblk *rcp)
/* If no RCU callbacks ready to invoke, just return. */
if (&rcp->rcucblist == rcp->donetail) {
RCU_TRACE(trace_rcu_batch_start(0, -1));
RCU_TRACE(trace_rcu_batch_end(0));
RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, -1));
RCU_TRACE(trace_rcu_batch_end(rcp->name, 0));
return;
}
/* Move the ready-to-invoke callbacks to a local list. */
local_irq_save(flags);
RCU_TRACE(trace_rcu_batch_start(0, -1));
RCU_TRACE(trace_rcu_batch_start(rcp->name, 0, -1));
list = rcp->rcucblist;
rcp->rcucblist = *rcp->donetail;
*rcp->donetail = NULL;
@ -197,7 +197,7 @@ static void rcu_process_callbacks(struct rcu_ctrlblk *rcp)
RCU_TRACE(cb_count++);
}
RCU_TRACE(rcu_trace_sub_qlen(rcp, cb_count));
RCU_TRACE(trace_rcu_batch_end(cb_count));
RCU_TRACE(trace_rcu_batch_end(rcp->name, cb_count));
}
/*

8
kernel/rcutree.c
View File

@ -1199,8 +1199,8 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
/* If no callbacks are ready, just return.*/
if (!cpu_has_callbacks_ready_to_invoke(rdp)) {
trace_rcu_batch_start(0, 0);
trace_rcu_batch_end(0);
trace_rcu_batch_start(rsp->name, 0, 0);
trace_rcu_batch_end(rsp->name, 0);
return;
}
@ -1210,7 +1210,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
*/
local_irq_save(flags);
bl = rdp->blimit;
trace_rcu_batch_start(rdp->qlen, bl);
trace_rcu_batch_start(rsp->name, rdp->qlen, bl);
list = rdp->nxtlist;
rdp->nxtlist = *rdp->nxttail[RCU_DONE_TAIL];
*rdp->nxttail[RCU_DONE_TAIL] = NULL;
@ -1233,7 +1233,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
}
local_irq_save(flags);
trace_rcu_batch_end(count);
trace_rcu_batch_end(rsp->name, count);
/* Update count, and requeue any remaining callbacks. */
rdp->qlen -= count;