From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8B6AC04E69 for ; Wed, 2 Aug 2023 15:09:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234365AbjHBPJu (ORCPT ); Wed, 2 Aug 2023 11:09:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233767AbjHBPJk (ORCPT ); Wed, 2 Aug 2023 11:09:40 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9C0B3588; Wed, 2 Aug 2023 08:09:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9832E619E9; Wed, 2 Aug 2023 15:09:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62899C433C9; Wed, 2 Aug 2023 15:09:00 +0000 (UTC) Date: Wed, 2 Aug 2023 11:08:58 -0400 From: Steven Rostedt To: Ze Gao Cc: Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Ian Rogers , Ingo Molnar , Jiri Olsa , Mark Rutland , Masami Hiramatsu , Namhyung Kim , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org, Ze Gao Subject: Re: [RFC PATCH v4 7/7] libtraceevent: prefer to use prev_state_char introduced in sched_switch Message-ID: <20230802110858.723d0fa1@gandalf.local.home> In-Reply-To: <20230802121116.324604-8-zegao@tencent.com> References: <20230802121116.324604-1-zegao@tencent.com> <20230802121116.324604-8-zegao@tencent.com> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org On Wed, 2 Aug 2023 08:10:02 -0400 Ze Gao wrote: > Since the sched_switch tracepoint introduces a new variable to > report sched-out task state in symbolic char, we prefer to use > it to spare from knowing internal implementations in kernel. > > Also we keep the old parsing logic intact but sync the state char > array with the latest kernel. > This should also go to linux-trace-devel@vger.kernel.org. > Signed-off-by: Ze Gao > --- > plugins/plugin_sched_switch.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/plugins/plugin_sched_switch.c b/plugins/plugin_sched_switch.c > index e0986ac..4c57322 100644 > --- a/plugins/plugin_sched_switch.c > +++ b/plugins/plugin_sched_switch.c > @@ -11,7 +11,7 @@ > > static void write_state(struct trace_seq *s, int val) > { > - const char states[] = "SDTtXZPI"; > + const char states[] = "SDTtXZPIp"; > int found = 0; > int i; > > @@ -99,7 +99,12 @@ static int sched_switch_handler(struct trace_seq *s, > if (tep_get_field_val(s, event, "prev_prio", record, &val, 1) == 0) > trace_seq_printf(s, "[%d] ", (int) val); > > - if (tep_get_field_val(s, event, "prev_state", record, &val, 1) == 0) > + //find if has prev_state_char, otherwise fallback to prev_state Use standard C comment notation "/* ... */" > + if (tep_find_field(event, "prev_state_char")) { > + if (tep_get_field_val(s, event, "prev_state_char", record, &val, 1) == 0) > + trace_seq_putc(s, (char) val); > + } > + else if (tep_get_field_val(s, event, "prev_state", record, &val, 1) == 0) This should be: } else if (..) { > write_state(s, val); } -- Steve > > trace_seq_puts(s, " ==> ");