From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 1683C6B026B for ; Tue, 13 Sep 2016 05:48:32 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id v67so415939194pfv.1 for ; Tue, 13 Sep 2016 02:48:32 -0700 (PDT) Received: from lgeamrelo11.lge.com (LGEAMRELO11.lge.com. [156.147.23.51]) by mx.google.com with ESMTP id s2si26767244pfj.297.2016.09.13.02.48.11 for ; Tue, 13 Sep 2016 02:48:12 -0700 (PDT) From: Byungchul Park 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> 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: 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