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tracing/lock: provide lock_acquired event support for dynamic size string 

Now that we can support the dynamic sized string, make the lock tracing
able to use it, making it safe against modules removal and consuming
the right amount of memory needed for each lock name

Changes in v2:
adapt to the __ending_string() updates and the opening_string() removal.

[ Impact: protect lock tracer against module removal ]

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Frederic Weisbecker 2009-04-19 04:54:49 +02:00 committed by Ingo Molnar
parent 9cbf117662
commit 7e7ca9a22d
1 changed files with 3 additions and 3 deletions
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6
include/trace/events/lockdep.h
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@ -38,16 +38,16 @@ TRACE_EVENT(lock_acquired,
TP_ARGS(lock, ip, waittime),
TP_STRUCT__entry(
__field(const char *, name)
__string(name, lock->name)
__field(unsigned long, wait_usec)
__field(unsigned long, wait_nsec_rem)
),
TP_fast_assign(
__entry->name = lock->name;
__assign_str(name, lock->name);
__entry->wait_nsec_rem = do_div(waittime, NSEC_PER_USEC);
__entry->wait_usec = (unsigned long) waittime;
),
TP_printk("%s (%lu.%03lu us)", __entry->name, __entry->wait_usec,
TP_printk("%s (%lu.%03lu us)", __get_str(name), __entry->wait_usec,
__entry->wait_nsec_rem)
);