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tracing: Drop lock_acquired waittime field

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Drop the waittime field from the lock_acquired event, we can
calculate it by substracting the lock_acquired event timestamp
with the matching lock_acquire one.

It is not needed and takes useless space in the traces.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Frederic Weisbecker 2010-05-08 06:16:11 +02:00
parent 90c0e5fc7b
commit 883a2a3189
2 changed files with 5 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/trace/events/lock.h
View File

@ -78,24 +78,21 @@ TRACE_EVENT(lock_contended,
); );
TRACE_EVENT(lock_acquired, TRACE_EVENT(lock_acquired,
TP_PROTO(struct lockdep_map *lock, unsigned long ip, s64 waittime), TP_PROTO(struct lockdep_map *lock, unsigned long ip),
TP_ARGS(lock, ip, waittime), TP_ARGS(lock, ip),
TP_STRUCT__entry( TP_STRUCT__entry(
__string(name, lock->name) __string(name, lock->name)
__field(s64, wait_nsec)
__field(void *, lockdep_addr) __field(void *, lockdep_addr)
), ),
TP_fast_assign( TP_fast_assign(
__assign_str(name, lock->name); __assign_str(name, lock->name);
__entry->wait_nsec = waittime;
__entry->lockdep_addr = lock; __entry->lockdep_addr = lock;
), ),
TP_printk("%p %s (%llu ns)", __entry->lockdep_addr, TP_printk("%p %s", __entry->lockdep_addr,
__get_str(name), __get_str(name))
__entry->wait_nsec)
); );
#endif #endif

2
kernel/lockdep.c
View File

@ -3380,7 +3380,7 @@ found_it:
hlock->holdtime_stamp = now; hlock->holdtime_stamp = now;
} }
trace_lock_acquired(lock, ip, waittime); trace_lock_acquired(lock, ip);
stats = get_lock_stats(hlock_class(hlock)); stats = get_lock_stats(hlock_class(hlock));
if (waittime) { if (waittime) {