From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932318AbcIMJtD (ORCPT ); Tue, 13 Sep 2016 05:49:03 -0400 Received: from LGEAMRELO11.lge.com ([156.147.23.51]:33731 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757583AbcIMJsM (ORCPT ); Tue, 13 Sep 2016 05:48:12 -0400 X-Original-SENDERIP: 156.147.1.127 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 10.177.222.33 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: peterz@infradead.org, mingo@kernel.org Cc: tglx@linutronix.de, walken@google.com, boqun.feng@gmail.com, kirill@shutemov.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, npiggin@gmail.com Subject: [PATCH v3 08/15] lockdep: Make crossrelease use save_stack_trace_fast() Date: Tue, 13 Sep 2016 18:45:07 +0900 Message-Id: <1473759914-17003-9-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1473759914-17003-1-git-send-email-byungchul.park@lge.com> References: <1473759914-17003-1-git-send-email-byungchul.park@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently crossrelease feature uses save_stack_trace() to save backtrace. However, it has much overhead. So this patch makes it use save_stack_trace_norm() instead, which has smaller overhead. Signed-off-by: Byungchul Park --- kernel/locking/lockdep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 2c8b2c1..fbd07ee 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -4768,7 +4768,7 @@ static void add_plock(struct held_lock *hlock, unsigned int prev_gen_id, plock->trace.max_entries = MAX_PLOCK_TRACE_ENTRIES; plock->trace.entries = plock->trace_entries; plock->trace.skip = 3; - save_stack_trace(&plock->trace); + save_stack_trace_fast(&plock->trace); } } -- 1.9.1