linux-kernel - [tip:perf/core] perf machine: No need to keep a refcnt for last

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Message-ID: <tip-98kuesmfwtvhsrzx7ttyb0kt@git.kernel.org>
Date:	Thu, 14 May 2015 23:45:37 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, fweisbec@...il.com, hpa@...or.com, bp@...e.de,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	mingo@...nel.org, dsahern@...il.com, dzickus@...hat.com,
	acme@...hat.com, jolsa@...hat.com, eranian@...gle.com,
	adrian.hunter@...el.com
Subject: [tip:perf/core] perf machine:
  No need to keep a refcnt for last_match

Commit-ID:  0ceb8f6e6cbafee0fa0e671e48213e24fae887f7
Gitweb:     http://git.kernel.org/tip/0ceb8f6e6cbafee0fa0e671e48213e24fae887f7
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 11 May 2015 18:08:12 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 12 May 2015 09:59:52 -0300

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@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-98kuesmfwtvhsrzx7ttyb0kt@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/machine.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 8b0b307..34bf89f 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -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)
--
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