From patchwork Wed Jul 26 12:16:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ze Gao X-Patchwork-Id: 13327928 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 D6612C001B0 for ; Wed, 26 Jul 2023 12:16:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233101AbjGZMQg (ORCPT ); Wed, 26 Jul 2023 08:16:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232529AbjGZMQd (ORCPT ); Wed, 26 Jul 2023 08:16:33 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2B2F10F6; Wed, 26 Jul 2023 05:16:31 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id 98e67ed59e1d1-268541d2947so285847a91.3; Wed, 26 Jul 2023 05:16:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690373791; x=1690978591; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=+7C0SBBUXP7O5XpijSeSyahi4TrgeBmdTgGvodmmzYM=; b=XzMmYD4oHTLISgh06EvMKIHnqyDaAepCtWmGauT3Qzqyb7kZLLWqYfYbB4Pm7yav9d je6i3VWhEw6JUGHj+xZR2N5681313IbwF2AMc/szvtVKYHys/kusZbo8o0Y42jGY/8rJ Momphh63sD5VKFa2RGMHrQWJVyhqP+tejBn5Ciet8SlRYk8LVWjk0MWa6nQXRaFJrs68 KPe+6J5dANx1jE+NccjEXdLgUKBlCyrfMYb/6Gy4n4sdhsfgJ5yiMxd29fFaO671ryeT N7O8pn2YOw0BNB1O3ZT5jR0b2VEFqVJHzxzg9+9PHrTEOws8ULVd7x5TmjMtxXNAqqfx g00g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690373791; x=1690978591; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+7C0SBBUXP7O5XpijSeSyahi4TrgeBmdTgGvodmmzYM=; b=iFdVTIvWPgVLYv++RKfW7uKonQIJjwKv7ja36vcsV57gvArqnV6r657rigULFvivCw 8EMeaM9pokIvBQeCMM5/iXnOSJI7ZqElwF+QatYA26V3wRAJLPKuQdxKTe1JtkDXSAQR 42IJKnwoch45o0zDxC8Ykk9qtaELTN33hl4KNd4YTThuZhidgnh1aUA62jB8r5Ke2qRY PO67CiZai37knZGQ90vEAfDsf0k5yvuQoI7Jg2c6MyDThC/iuKg06zUKMgOAoj/JXCli k6B5Pz4n08QPF0n6x5my0ht+scRYupOWrfZDwqDUVaMmDd1MnNtzAj6Ue6sgh26IQ07e yxNA== X-Gm-Message-State: ABy/qLYz+OkkXWiCvlw2/09ww/pGUYQqTSOjf8yrx1TGPYknC5Vm/F54 ogEZ486eJNgt+W6AbI3ReJI= X-Google-Smtp-Source: APBJJlFPvsWN5escZL4T61sXRxRP6pt3wd53DBOmWtJCu0YtL1ojSt6nONVrv047Sx2zgvhHDjVHYA== X-Received: by 2002:a17:90b:3b81:b0:263:f435:ef2d with SMTP id pc1-20020a17090b3b8100b00263f435ef2dmr1326501pjb.10.1690373791215; Wed, 26 Jul 2023 05:16:31 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.25]) by smtp.googlemail.com with ESMTPSA id ms19-20020a17090b235300b00263f446d432sm1172880pjb.43.2023.07.26.05.16.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 05:16:30 -0700 (PDT) From: Ze Gao X-Google-Original-From: Ze Gao To: Peter Zijlstra , Steven Rostedt , Namhyung Kim Cc: Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Ian Rogers , Ingo Molnar , Jiri Olsa , Mark Rutland , Masami Hiramatsu , 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: [RFC PATCH v2 1/3] sched, tracing: add to report task state in symbolic chars Date: Wed, 26 Jul 2023 20:16:16 +0800 Message-Id: <20230726121618.19198-2-zegao@tencent.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230726121618.19198-1-zegao@tencent.com> References: <20230726121618.19198-1-zegao@tencent.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Internal representations of task state are likely to be changed or ordered, and reporting them to userspace without exporting them as part of API is not a good choice, which can easily break a userspace observability tool as kernel evolves. For example, perf suffers from this and still reports wrong states by this patch. OTOH, some masqueraded state like TASK_REPORT_IDLE and TASK_REPORT_MAX are also reported inadvertently, which confuses things even more. So add a new variable in company with the old raw value to report task state in symbolic char, which is self-explaining and no further translation is needed, and also report priorities in 'short' to save some buffer space. Of course this does not break any userspace tool. Note for PREEMPT_ACTIVE, we introduce 'p' to report it and use the old conventions for the rest. Signed-off-by: Ze Gao --- include/trace/events/sched.h | 60 +++++++++++++++++++++--------------- 1 file changed, 35 insertions(+), 25 deletions(-) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index fbb99a61f714..0fcf68f49e45 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -6,6 +6,7 @@ #define _TRACE_SCHED_H #include +#include #include #include #include @@ -214,6 +215,27 @@ static inline long __trace_sched_switch_state(bool preempt, return state ? (1 << (state - 1)) : state; } + +static inline char __trace_sched_switch_state_char(bool preempt, + unsigned int prev_state, + struct task_struct *p) +{ + long state; + +#ifdef CONFIG_SCHED_DEBUG + BUG_ON(p != current); +#endif /* CONFIG_SCHED_DEBUG */ + + /* + * For PREEMPT_ACTIVE, we introduce 'p' to report it and use the old + * conventions for the rest. + */ + if (preempt) + return 'p'; + + state = __task_state_index(prev_state, p->exit_state); + return task_index_to_char(state); +} #endif /* CREATE_TRACE_POINTS */ /* @@ -231,41 +253,29 @@ TRACE_EVENT(sched_switch, TP_STRUCT__entry( __array( char, prev_comm, TASK_COMM_LEN ) __field( pid_t, prev_pid ) - __field( int, prev_prio ) - __field( long, prev_state ) + __field( short, prev_prio ) + __field( int, prev_state ) + __field( char, prev_state_char ) __array( char, next_comm, TASK_COMM_LEN ) __field( pid_t, next_pid ) - __field( int, next_prio ) + __field( short, next_prio ) ), TP_fast_assign( memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN); - __entry->prev_pid = prev->pid; - __entry->prev_prio = prev->prio; - __entry->prev_state = __trace_sched_switch_state(preempt, prev_state, prev); + __entry->prev_pid = prev->pid; + __entry->prev_prio = (short) prev->prio; + __entry->prev_state = __trace_sched_switch_state(preempt, prev_state, prev); + __entry->prev_state_char = __trace_sched_switch_state_char(preempt, prev_state, prev); memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN); - __entry->next_pid = next->pid; - __entry->next_prio = next->prio; + __entry->next_pid = next->pid; + __entry->next_prio = (short) next->prio; /* XXX SCHED_DEADLINE */ ), - TP_printk("prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==> next_comm=%s next_pid=%d next_prio=%d", - __entry->prev_comm, __entry->prev_pid, __entry->prev_prio, - - (__entry->prev_state & (TASK_REPORT_MAX - 1)) ? - __print_flags(__entry->prev_state & (TASK_REPORT_MAX - 1), "|", - { TASK_INTERRUPTIBLE, "S" }, - { TASK_UNINTERRUPTIBLE, "D" }, - { __TASK_STOPPED, "T" }, - { __TASK_TRACED, "t" }, - { EXIT_DEAD, "X" }, - { EXIT_ZOMBIE, "Z" }, - { TASK_PARKED, "P" }, - { TASK_DEAD, "I" }) : - "R", - - __entry->prev_state & TASK_REPORT_MAX ? "+" : "", - __entry->next_comm, __entry->next_pid, __entry->next_prio) + TP_printk("prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%c ==> next_comm=%s next_pid=%d next_prio=%d", + __entry->prev_comm, __entry->prev_pid, __entry->prev_prio, __entry->prev_state_char, __entry->next_comm, + __entry->next_pid, __entry->next_prio) ); /* From patchwork Wed Jul 26 12:16:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ze Gao X-Patchwork-Id: 13327929 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 3E74EC001E0 for ; Wed, 26 Jul 2023 12:16:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233509AbjGZMQi (ORCPT ); Wed, 26 Jul 2023 08:16:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232844AbjGZMQh (ORCPT ); Wed, 26 Jul 2023 08:16:37 -0400 Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CCDB310F6; Wed, 26 Jul 2023 05:16:35 -0700 (PDT) Received: by mail-il1-x135.google.com with SMTP id e9e14a558f8ab-3464c774f23so30945965ab.1; Wed, 26 Jul 2023 05:16:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690373795; x=1690978595; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=SNtS9F3WTNQE3HkYohBKkdu8+BM/TX/VXbV+TW+htq8=; b=JDgd3f78clfCjnhOza+o4KM7mE7U7JJXcZPDO6I+F5KHhmnche6Fu+P1BIrzPyj7rw VZPW4B+n19JC+Xc9SvSmJkKmHaUlMbTBBQroCIU645dx+8XPnHp9Hpb334uueMjH9UBg J+x9/Pts58rKtA1B3ElJrj34ReusbA47AljbgwX7/ZO3Qj+2jO5r9xuy/o7Yf2LlRbAF WiCny5ApTLDgZ99KZC4++dgMijymsaGoesFv6Vegkr+au3GmLNRbECFYa1/227o5S26z CVgirl4WRdDNcKUpU8xsNrF6FnaGtulvkpQdQ8Ncb/djvhyitButfXYUfInPbRE0AH0O 2nFw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690373795; x=1690978595; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SNtS9F3WTNQE3HkYohBKkdu8+BM/TX/VXbV+TW+htq8=; b=SWcXPyEfU7XYJ4z8Grvctv+AWPyYhG9A3UVQMRFv3lg3/PkAAZ4aUJ3mjmrPTJ4rq2 s4MavVV+O25o9eu2AT36f8GP/hgXL/vLAeer+3AzqN+uuQQbRhmLO9C1DcsReilxUefB CFPnCsKVg/VHyBnMv6E4bY+gReYoxZlzAlrtWJanO0UfOVGvmb5nnYK1lwCabsBpU/7m +DjKEXtkI4yR68U0xO89KN1rAqAHhBcqNO3f+JA/q2plIiX2VmUA379DoJceTlDZpL22 Ed3vGuB0Ls04xWfkh/PrDcxSmMmYMsB0FSkWruaTVXNWfqHwLB5sBL6VhtomsLsfthXv Qheg== X-Gm-Message-State: ABy/qLaniIItj9NR5ibXOtbnJuKQg9ns0wgbGTMyfWaTdG/aTfKsC9cE FoF/DTgZ6jTjCMONHtcCtY8= X-Google-Smtp-Source: APBJJlG6c1z+CkusDB+L0vw/xEMbf2SJ2s759KnIa3516NN53tLp0ztmHEnXwSdrixF4HGOYAjVl3A== X-Received: by 2002:a92:c56d:0:b0:348:b07e:fd9e with SMTP id b13-20020a92c56d000000b00348b07efd9emr2096579ilj.16.1690373795086; Wed, 26 Jul 2023 05:16:35 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.25]) by smtp.googlemail.com with ESMTPSA id ms19-20020a17090b235300b00263f446d432sm1172880pjb.43.2023.07.26.05.16.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 05:16:34 -0700 (PDT) From: Ze Gao X-Google-Original-From: Ze Gao To: Peter Zijlstra , Steven Rostedt , Namhyung Kim Cc: Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Ian Rogers , Ingo Molnar , Jiri Olsa , Mark Rutland , Masami Hiramatsu , 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: [RFC PATCH v2 2/3] perf sched: use the new prev_state_char instead in tracepoint sched_switch Date: Wed, 26 Jul 2023 20:16:17 +0800 Message-Id: <20230726121618.19198-3-zegao@tencent.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230726121618.19198-1-zegao@tencent.com> References: <20230726121618.19198-1-zegao@tencent.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Since the sched_switch tracepoint introduces a new variable to report sched-out task state in symbolic char, we switch to use that instead to spare from knowing internal implementations in kernel. Signed-off-by: Ze Gao --- tools/perf/builtin-sched.c | 57 +++++++------------------------------- 1 file changed, 10 insertions(+), 47 deletions(-) diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index cc4ba506e119..e3b31d526bc8 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -92,24 +92,6 @@ struct sched_atom { struct task_desc *wakee; }; -#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" - -/* task state bitmask, copied from include/linux/sched.h */ -#define TASK_RUNNING 0 -#define TASK_INTERRUPTIBLE 1 -#define TASK_UNINTERRUPTIBLE 2 -#define __TASK_STOPPED 4 -#define __TASK_TRACED 8 -/* in tsk->exit_state */ -#define EXIT_DEAD 16 -#define EXIT_ZOMBIE 32 -#define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) -/* in tsk->state again */ -#define TASK_DEAD 64 -#define TASK_WAKEKILL 128 -#define TASK_WAKING 256 -#define TASK_PARKED 512 - enum thread_state { THREAD_SLEEPING = 0, THREAD_WAIT_CPU, @@ -266,7 +248,7 @@ struct thread_runtime { u64 total_preempt_time; u64 total_delay_time; - int last_state; + char last_state; char shortname[3]; bool comm_changed; @@ -436,7 +418,7 @@ static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *t } static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task, - u64 timestamp, u64 task_state __maybe_unused) + u64 timestamp, char task_state __maybe_unused) { struct sched_atom *event = get_new_event(task, timestamp); @@ -860,7 +842,7 @@ static int replay_switch_event(struct perf_sched *sched, *next_comm = evsel__strval(evsel, sample, "next_comm"); const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"), next_pid = evsel__intval(evsel, sample, "next_pid"); - const u64 prev_state = evsel__intval(evsel, sample, "prev_state"); + const char prev_state = evsel__intval(evsel, sample, "prev_state_char"); struct task_desc *prev, __maybe_unused *next; u64 timestamp0, timestamp = sample->time; int cpu = sample->cpu; @@ -1050,13 +1032,6 @@ static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread) return 0; } -static char sched_out_state(u64 prev_state) -{ - const char *str = TASK_STATE_TO_CHAR_STR; - - return str[prev_state]; -} - static int add_sched_out_event(struct work_atoms *atoms, char run_state, @@ -1132,7 +1107,7 @@ static int latency_switch_event(struct perf_sched *sched, { const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"), next_pid = evsel__intval(evsel, sample, "next_pid"); - const u64 prev_state = evsel__intval(evsel, sample, "prev_state"); + const char prev_state = evsel__intval(evsel, sample, "prev_state_char"); struct work_atoms *out_events, *in_events; struct thread *sched_out, *sched_in; u64 timestamp0, timestamp = sample->time; @@ -1168,7 +1143,7 @@ static int latency_switch_event(struct perf_sched *sched, goto out_put; } } - if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp)) + if (add_sched_out_event(out_events, prev_state, timestamp)) return -1; in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid); @@ -2026,24 +2001,12 @@ static void timehist_header(struct perf_sched *sched) printf("\n"); } -static char task_state_char(struct thread *thread, int state) -{ - static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; - unsigned bit = state ? ffs(state) : 0; - - /* 'I' for idle */ - if (thread->tid == 0) - return 'I'; - - return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; -} - static void timehist_print_sample(struct perf_sched *sched, struct evsel *evsel, struct perf_sample *sample, struct addr_location *al, struct thread *thread, - u64 t, int state) + u64 t, char state) { struct thread_runtime *tr = thread__priv(thread); const char *next_comm = evsel__strval(evsel, sample, "next_comm"); @@ -2084,7 +2047,7 @@ static void timehist_print_sample(struct perf_sched *sched, print_sched_time(tr->dt_run, 6); if (sched->show_state) - printf(" %5c ", task_state_char(thread, state)); + printf(" %5c ", thread->tid == 0 ? 'I' : state); if (sched->show_next) { snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid); @@ -2156,9 +2119,9 @@ static void timehist_update_runtime_stats(struct thread_runtime *r, else if (r->last_time) { u64 dt_wait = tprev - r->last_time; - if (r->last_state == TASK_RUNNING) + if (r->last_state == 'R' || r->last_state == 'p') r->dt_preempt = dt_wait; - else if (r->last_state == TASK_UNINTERRUPTIBLE) + else if (r->last_state == 'D') r->dt_iowait = dt_wait; else r->dt_sleep = dt_wait; @@ -2575,7 +2538,7 @@ static int timehist_sched_change_event(struct perf_tool *tool, struct thread_runtime *tr = NULL; u64 tprev, t = sample->time; int rc = 0; - int state = evsel__intval(evsel, sample, "prev_state"); + char state = evsel__intval(evsel, sample, "prev_state_char"); if (machine__resolve(machine, &al, sample) < 0) { pr_err("problem processing %d event. skipping it\n", From patchwork Wed Jul 26 12:16:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ze Gao X-Patchwork-Id: 13327930 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 61533C001DE for ; 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Wed, 26 Jul 2023 05:16:38 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.25]) by smtp.googlemail.com with ESMTPSA id ms19-20020a17090b235300b00263f446d432sm1172880pjb.43.2023.07.26.05.16.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 05:16:38 -0700 (PDT) From: Ze Gao X-Google-Original-From: Ze Gao To: Peter Zijlstra , Steven Rostedt , Namhyung Kim Cc: Adrian Hunter , Alexander Shishkin , Arnaldo Carvalho de Melo , Ian Rogers , Ingo Molnar , Jiri Olsa , Mark Rutland , Masami Hiramatsu , 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: [RFC PATCH v2 3/3] libtraceevent: use the new prev_state_char instead in tracepoint sched_switch Date: Wed, 26 Jul 2023 20:16:18 +0800 Message-Id: <20230726121618.19198-4-zegao@tencent.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230726121618.19198-1-zegao@tencent.com> References: <20230726121618.19198-1-zegao@tencent.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Since the sched_switch tracepoint introduces a new variable to report sched-out task state in symbolic char, we switch to use that instead to spare from knowing internal implementations in kernel. Signed-off-by: Ze Gao --- plugins/plugin_sched_switch.c | 29 ++++------------------------- 1 file changed, 4 insertions(+), 25 deletions(-) diff --git a/plugins/plugin_sched_switch.c b/plugins/plugin_sched_switch.c index 8752cae..5dbdc28 100644 --- a/plugins/plugin_sched_switch.c +++ b/plugins/plugin_sched_switch.c @@ -9,27 +9,6 @@ #include "event-parse.h" #include "trace-seq.h" -static void write_state(struct trace_seq *s, int val) -{ - const char states[] = "SDTtZXxW"; - int found = 0; - int i; - - for (i = 0; i < (sizeof(states) - 1); i++) { - if (!(val & (1 << i))) - continue; - - if (found) - trace_seq_putc(s, '|'); - - found = 1; - trace_seq_putc(s, states[i]); - } - - if (!found) - trace_seq_putc(s, 'R'); -} - static void write_and_save_comm(struct tep_format_field *field, struct tep_record *record, struct trace_seq *s, int pid) @@ -97,10 +76,10 @@ static int sched_switch_handler(struct trace_seq *s, trace_seq_printf(s, "%lld ", val); if (tep_get_field_val(s, event, "prev_prio", record, &val, 1) == 0) - trace_seq_printf(s, "[%d] ", (int) val); + trace_seq_printf(s, "[%d] ", (short) val); - if (tep_get_field_val(s, event, "prev_state", record, &val, 1) == 0) - write_state(s, val); + if (tep_get_field_val(s, event, "prev_state_char", record, &val, 1) == 0) + trace_seq_putc(s, (char) val); trace_seq_puts(s, " ==> "); @@ -115,7 +94,7 @@ static int sched_switch_handler(struct trace_seq *s, trace_seq_printf(s, "%lld", val); if (tep_get_field_val(s, event, "next_prio", record, &val, 1) == 0) - trace_seq_printf(s, " [%d]", (int) val); + trace_seq_printf(s, " [%d]", (short) val); return 0; }