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rcu: Deconfuse dynticks entry-exit tracing

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The trace_rcu_dyntick() trace event did not print both the old and
the new value of the nesting level, and furthermore printed only
the low-order 32 bits of it.  This could result in some confusion
when interpreting trace-event dumps, so this commit prints both
the old and the new value, prints the full 64 bits, and also selects
the process-entry/exit increment to print nicely in hexadecimal.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney
2011-10-31 15:01:54 -07:00
committed by Paul E. McKenney
parent 9ceae0e248
commit 4145fa7fbe
4 changed files with 53 additions and 32 deletions
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15
include/trace/events/rcu.h
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@@ -246,21 +246,24 @@ TRACE_EVENT(rcu_fqs,
*/
TRACE_EVENT(rcu_dyntick,
TP_PROTO(char *polarity, int nesting),
TP_PROTO(char *polarity, long long oldnesting, long long newnesting),
TP_ARGS(polarity, nesting),
TP_ARGS(polarity, oldnesting, newnesting),
TP_STRUCT__entry(
__field(char *, polarity)
__field(int, nesting)
__field(long long, oldnesting)
__field(long long, newnesting)
),
TP_fast_assign(
__entry->polarity = polarity;
__entry->nesting = nesting;
__entry->oldnesting = oldnesting;
__entry->newnesting = newnesting;
),
TP_printk("%s %d", __entry->polarity, __entry->nesting)
TP_printk("%s %llx %llx", __entry->polarity,
__entry->oldnesting, __entry->newnesting)
);
/*
@@ -470,7 +473,7 @@ TRACE_EVENT(rcu_torture_read,
#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
#define trace_rcu_quiescent_state_report(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks) do { } while (0)
#define trace_rcu_fqs(rcuname, gpnum, cpu, qsevent) do { } while (0)
#define trace_rcu_dyntick(polarity, nesting) do { } while (0)
#define trace_rcu_dyntick(polarity, oldnesting, newnesting) do { } while (0)
#define trace_rcu_callback(rcuname, rhp, qlen) do { } while (0)
#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen) do { } while (0)
#define trace_rcu_batch_start(rcuname, qlen, blimit) do { } while (0)