From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933361AbcLIFSR (ORCPT ); Fri, 9 Dec 2016 00:18:17 -0500 Received: from LGEAMRELO11.lge.com ([156.147.23.51]:58904 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753607AbcLIFQg (ORCPT ); Fri, 9 Dec 2016 00:16:36 -0500 X-Original-SENDERIP: 156.147.1.125 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 v4 08/15] lockdep: Make crossrelease use save_stack_trace_fast() Date: Fri, 9 Dec 2016 14:12:04 +0900 Message-Id: <1481260331-360-9-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1481260331-360-1-git-send-email-byungchul.park@lge.com> References: <1481260331-360-1-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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id A7AF06B026D for ; Fri, 9 Dec 2016 00:16:36 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id y71so17217386pgd.0 for ; Thu, 08 Dec 2016 21:16:36 -0800 (PST) Received: from lgeamrelo11.lge.com (LGEAMRELO11.lge.com. [156.147.23.51]) by mx.google.com with ESMTP id l4si32043043plb.98.2016.12.08.21.16.35 for ; Thu, 08 Dec 2016 21:16:35 -0800 (PST) From: Byungchul Park Subject: [PATCH v4 08/15] lockdep: Make crossrelease use save_stack_trace_fast() Date: Fri, 9 Dec 2016 14:12:04 +0900 Message-Id: <1481260331-360-9-git-send-email-byungchul.park@lge.com> In-Reply-To: <1481260331-360-1-git-send-email-byungchul.park@lge.com> References: <1481260331-360-1-git-send-email-byungchul.park@lge.com> Sender: owner-linux-mm@kvack.org List-ID: 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 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org