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author | Paul E. McKenney <paul.mckenney@linaro.org> | 2011-06-19 05:26:31 (GMT) |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-09-29 04:38:13 (GMT) |
commit | 300df91ca9358f7f09298eec9503c12b32054ef7 (patch) | |
tree | 8917e0c2ee94a5385f4968094c0e1d9a7fdc0055 /include/trace/events/rcu.h | |
parent | 29c00b4a1d9e277786120032aa8364631820d863 (diff) | |
download | linux-300df91ca9358f7f09298eec9503c12b32054ef7.tar.xz |
rcu: Event-trace markers for computing RCU CPU utilization
This commit adds the trace_rcu_utilization() marker that is to be
used to allow postprocessing scripts compute RCU's CPU utilization,
give or take event-trace overhead. Note that we do not include RCU's
dyntick-idle interface because event tracing requires RCU protection,
which is not available in dyntick-idle mode.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace/events/rcu.h')
-rw-r--r-- | include/trace/events/rcu.h | 73 |
1 files changed, 53 insertions, 20 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index db3f6e9..ab458eb 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -7,29 +7,58 @@ #include <linux/tracepoint.h> /* - * Tracepoint for calling rcu_do_batch, performed to start callback invocation: + * Tracepoint for start/end markers used for utilization calculations. + * By convention, the string is of the following forms: + * + * "Start <activity>" -- Mark the start of the specified activity, + * such as "context switch". Nesting is permitted. + * "End <activity>" -- Mark the end of the specified activity. + */ +TRACE_EVENT(rcu_utilization, + + TP_PROTO(char *s), + + TP_ARGS(s), + + TP_STRUCT__entry( + __field(char *, s) + ), + + TP_fast_assign( + __entry->s = s; + ), + + TP_printk("%s", __entry->s) +); + +/* + * 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. */ TRACE_EVENT(rcu_batch_start, - TP_PROTO(long callbacks_ready, int blimit), + TP_PROTO(long qlen, int blimit), - TP_ARGS(callbacks_ready, blimit), + TP_ARGS(qlen, blimit), TP_STRUCT__entry( - __field( long, callbacks_ready ) - __field( int, blimit ) + __field(long, qlen) + __field(int, blimit) ), TP_fast_assign( - __entry->callbacks_ready = callbacks_ready; - __entry->blimit = blimit; + __entry->qlen = qlen; + __entry->blimit = blimit; ), - TP_printk("CBs=%ld bl=%d", __entry->callbacks_ready, __entry->blimit) + TP_printk("CBs=%ld bl=%d", __entry->qlen, __entry->blimit) ); /* - * Tracepoint for the invocation of a single RCU callback + * Tracepoint for the invocation of a single RCU callback function. + * The argument is a pointer to the RCU callback itself. */ TRACE_EVENT(rcu_invoke_callback, @@ -38,20 +67,23 @@ TRACE_EVENT(rcu_invoke_callback, TP_ARGS(rhp), TP_STRUCT__entry( - __field( void *, rhp ) - __field( void *, func ) + __field(void *, rhp) + __field(void *, func) ), TP_fast_assign( - __entry->rhp = rhp; - __entry->func = rhp->func; + __entry->rhp = rhp; + __entry->func = rhp->func; ), TP_printk("rhp=%p func=%pf", __entry->rhp, __entry->func) ); /* - * Tracepoint for the invocation of a single RCU kfree callback + * Tracepoint for the invocation of a single RCU callback of the special + * kfree() form. The first argument is a pointer to the RCU callback + * and the second argument is the offset of the callback within the + * enclosing RCU-protected data structure. */ TRACE_EVENT(rcu_invoke_kfree_callback, @@ -60,12 +92,12 @@ TRACE_EVENT(rcu_invoke_kfree_callback, TP_ARGS(rhp, offset), TP_STRUCT__entry( - __field(void *, rhp ) - __field(unsigned long, offset ) + __field(void *, rhp) + __field(unsigned long, offset) ), TP_fast_assign( - __entry->rhp = rhp; + __entry->rhp = rhp; __entry->offset = offset; ), @@ -73,7 +105,8 @@ TRACE_EVENT(rcu_invoke_kfree_callback, ); /* - * Tracepoint for leaving rcu_do_batch, performed after callback invocation: + * Tracepoint for exiting rcu_do_batch after RCU callbacks have been + * invoked. The first argument is the number of callbacks actually invoked. */ TRACE_EVENT(rcu_batch_end, @@ -82,11 +115,11 @@ TRACE_EVENT(rcu_batch_end, TP_ARGS(callbacks_invoked), TP_STRUCT__entry( - __field( int, callbacks_invoked ) + __field(int, callbacks_invoked) ), TP_fast_assign( - __entry->callbacks_invoked = callbacks_invoked; + __entry->callbacks_invoked = callbacks_invoked; ), TP_printk("CBs-invoked=%d", __entry->callbacks_invoked) |