From patchwork Thu Apr 18 08:41:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 10912665 X-Patchwork-Delegate: snitzer@redhat.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AC1751575 for ; Tue, 23 Apr 2019 10:29:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A49228806 for ; Tue, 23 Apr 2019 10:29:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8E1792882C; Tue, 23 Apr 2019 10:29:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 29A3828806 for ; Tue, 23 Apr 2019 10:29:03 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4A789309E9B5; Tue, 23 Apr 2019 10:29:02 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1ABA460156; Tue, 23 Apr 2019 10:29:02 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id D3C553FA4E; Tue, 23 Apr 2019 10:29:01 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id x3I9XjdH015052 for ; Thu, 18 Apr 2019 05:33:45 -0400 Received: by smtp.corp.redhat.com (Postfix) id 02359608D0; Thu, 18 Apr 2019 09:33:45 +0000 (UTC) Delivered-To: dm-devel@redhat.com Received: from mx1.redhat.com (ext-mx16.extmail.prod.ext.phx2.redhat.com [10.5.110.45]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EA1DF608C8; Thu, 18 Apr 2019 09:33:44 +0000 (UTC) Received: from Galois.linutronix.de (Galois.linutronix.de [146.0.238.70]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 423FE3002501; Thu, 18 Apr 2019 09:33:44 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1hH30D-0001tl-Se; Thu, 18 Apr 2019 11:06:42 +0200 Message-Id: <20190418084254.910579307@linutronix.de> User-Agent: quilt/0.65 Date: Thu, 18 Apr 2019 10:41:39 +0200 From: Thomas Gleixner To: LKML References: <20190418084119.056416939@linutronix.de> MIME-Version: 1.0 X-Greylist: Delayed for 00:27:14 by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Thu, 18 Apr 2019 09:33:44 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Thu, 18 Apr 2019 09:33:44 +0000 (UTC) for IP:'146.0.238.70' DOMAIN:'Galois.linutronix.de' HELO:'Galois.linutronix.de' FROM:'tglx@linutronix.de' RCPT:'' X-RedHat-Spam-Score: 0 () 146.0.238.70 Galois.linutronix.de 146.0.238.70 Galois.linutronix.de X-Scanned-By: MIMEDefang 2.84 on 10.5.110.45 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Tue, 23 Apr 2019 06:28:28 -0400 Cc: Mike Snitzer , David Airlie , Catalin Marinas , Joonas Lahtinen , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, dm-devel@redhat.com, Alexander Potapenko , Christoph Lameter , Christoph Hellwig , Alasdair Kergon , Marek Szyprowski , linux-arch@vger.kernel.org, x86@kernel.org, kasan-dev@googlegroups.com, Johannes Thumshirn , Andrey Ryabinin , Alexey Dobriyan , intel-gfx@lists.freedesktop.org, David Rientjes , Maarten Lankhorst , Akinobu Mita , Steven Rostedt , Josef Bacik , Rodrigo Vivi , Mike Rapoport , Jani Nikula , Andy Lutomirski , Josh Poimboeuf , David Sterba , Dmitry Vyukov , Chris Mason , Pekka Enberg , iommu@lists.linux-foundation.org, Daniel Vetter , Andrew Morton , Robin Murphy , linux-btrfs@vger.kernel.org Subject: [dm-devel] [patch V2 20/29] tracing: Simplify stacktrace retrieval in histograms X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Tue, 23 Apr 2019 10:29:02 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP The indirection through struct stack_trace is not necessary at all. Use the storage array based interface. Signed-off-by: Thomas Gleixner Cc: Steven Rostedt --- kernel/trace/trace_events_hist.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -5186,7 +5186,6 @@ static void event_hist_trigger(struct ev u64 var_ref_vals[TRACING_MAP_VARS_MAX]; char compound_key[HIST_KEY_SIZE_MAX]; struct tracing_map_elt *elt = NULL; - struct stack_trace stacktrace; struct hist_field *key_field; u64 field_contents; void *key = NULL; @@ -5198,14 +5197,9 @@ static void event_hist_trigger(struct ev key_field = hist_data->fields[i]; if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { - stacktrace.max_entries = HIST_STACKTRACE_DEPTH; - stacktrace.entries = entries; - stacktrace.nr_entries = 0; - stacktrace.skip = HIST_STACKTRACE_SKIP; - - memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE); - save_stack_trace(&stacktrace); - + memset(entries, 0, HIST_STACKTRACE_SIZE); + stack_trace_save(entries, HIST_STACKTRACE_DEPTH, + HIST_STACKTRACE_SKIP); key = entries; } else { field_contents = key_field->fn(key_field, elt, rbe, rec);