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perf machine: No need to keep a refcnt for last_match 

Since it is all associated with the refcount for keeping the thread
in the rbtree, it is excessive and unecessarily complex to hold a
refcont when changing machine->last_match.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-98kuesmfwtvhsrzx7ttyb0kt@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-05-11 18:08:12 -03:00
parent 8f1960138b
commit 0ceb8f6e6c
1 changed files with 4 additions and 4 deletions
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8
tools/perf/util/machine.c
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@ -364,7 +364,7 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
return th;
}
thread__zput(machine->last_match);
machine->last_match = NULL;
}
while (*p != NULL) {
@ -372,7 +372,7 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
th = rb_entry(parent, struct thread, rb_node);
if (th->tid == tid) {
machine->last_match = thread__get(th);
machine->last_match = th;
machine__update_thread_pid(machine, th, pid);
return th;
}
@ -409,7 +409,7 @@ static struct thread *____machine__findnew_thread(struct machine *machine,
* It is now in the rbtree, get a ref
*/
thread__get(th);
machine->last_match = thread__get(th);
machine->last_match = th;
}
return th;
@ -1309,7 +1309,7 @@ out_problem:
static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock)
{
if (machine->last_match == th)
thread__zput(machine->last_match);
machine->last_match = NULL;
BUG_ON(th->refcnt.counter == 0);
if (lock)