From nobody Sun Feb 8 18:09:20 2026 Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C2D131AF07; Mon, 12 Jan 2026 20:34:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768250050; cv=none; b=NYKD+MByCeQg5u3j+lfnMxQce4zEiB51AmMgkHp0HPs0CRhdUgz0K+7/HizeEkNT3dfwnJhGDxzcHLRWFUqMQw0Llru5zHZWChKVSX6ze+H3i+vttsPjEi2Lz0Elod69gBSd7aapMIjhjD264S1yDcKrc4oa7wG07BK/hadWPg8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768250050; c=relaxed/simple; bh=Ctm/5UbhDslth0m/M9OWgPMLCAGwzniSRSfGUxzzFDg=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type; b=f7Im8OZCqntLZHAqbcGJWBle/BrBkuwi9XcILbaAwuTK66DkRaFBXSk7RULIy6s4T2K8uGAeEcHr5FZsat3lTOtA2VMMKKPxBY1qiQCfIQjUz52Mq+lmTX4VIE4f9wEJAD/uZTGnqSpa7BwjAZ8MDdARochmImgdu6dCqYFEpFA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 290335D4A6; Mon, 12 Jan 2026 20:34:07 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf12.hostedemail.com (Postfix) with ESMTPA id 7B75417; Mon, 12 Jan 2026 20:34:05 +0000 (UTC) Date: Mon, 12 Jan 2026 15:34:08 -0500 From: Steven Rostedt To: LKML , Linux Trace Kernel Cc: Masami Hiramatsu , Mathieu Desnoyers , Aaron Tomlin Subject: [PATCH] tracing: Have show_event_trigger/filter format a bit more in columns Message-ID: <20260112153408.18373e73@gandalf.local.home> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspamout07 X-Rspamd-Queue-Id: 7B75417 X-Stat-Signature: scy8rph8hugkriafbzh5rb4zhhdkpddq X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX199k4TuyVDNbltNRNg3padwA1mUu2P8oF4= X-HE-Tag: 1768250045-879900 X-HE-Meta: U2FsdGVkX1/pk2HpnEo+dAPzeahhb4s8v5gcefkGkyg3d26hdGv1jJu7uoubJjjJSao9r675m9x4xQnUsfubpZ/A3hhYyRXdOz9Hfxqp0jUPejh/3hNwbLZNYWgzVm6UAzMCfZwxxdZahWb2M5djTidDtcwEYgA/w8OD0Pny6Ffgq4kHjuWFFz1eZ85779DlWNEe9k5jRoRnWKIBakX25leW5MsQjyw8vFUlxCiLlG03Kgci+LE8MnRuJYgnQrabEPtnBm8seyAsmz3OXyzRm5wEb0npuE3mQeWc/XWxxs+xIqztFNTaqxUV4DO7AfEi6oWOZshoQDM8kH/r9Drvp4xvnhn0c/yDbDz++SWxJubvyAaOuzDaRnUClxtZRqiBqc1SzfdPWXpaF7u/RAMtHPxxRRAwJ1hhPvnllbGtUYkjM9+PQYUJHdiDYKm6bSBQh78P3T8qEJAhiUA35RYCFw== Content-Type: text/plain; charset="utf-8" From: Steven Rostedt By doing: # trace-cmd sqlhist -e -n futex_wait select TIMESTAMP_DELTA_USECS as lat f= rom sys_enter_futex as start join sys_exit_futex as end on start.common_pid= =3D end.common_pid and # trace-cmd start -e futex_wait -f 'lat > 100' -e page_pool_state_release = -f 'pfn =3D=3D 1' The output of the show_event_trigger and show_event_filter files are well aligned because of the inconsistent 'tab' spacing: ~# cat /sys/kernel/tracing/show_event_triggers syscalls:sys_exit_futex hist:keys=3Dcommon_pid:vals=3Dhitcount:__lat_12046_= 2=3Dcommon_timestamp.usecs-$__arg_12046_1:sort=3Dhitcount:size=3D2048:clock= =3Dglobal:onmatch(syscalls.sys_enter_futex).trace(futex_wait,$__lat_12046_2= ) [active] syscalls:sys_enter_futex hist:keys=3Dcommon_pid:vals=3Dhitcount:__arg_12046= _1=3Dcommon_timestamp.usecs:sort=3Dhitcount:size=3D2048:clock=3Dglobal [act= ive] ~# cat /sys/kernel/tracing/show_event_filters synthetic:futex_wait (lat > 100) page_pool:page_pool_state_release (pfn =3D=3D 1) This makes it not so easy to read. Instead, force the spacing to be at least 32 bytes from the beginning (one space if the system:event is longer than 30 bytes): ~# cat /sys/kernel/tracing/show_event_triggers syscalls:sys_exit_futex hist:keys=3Dcommon_pid:vals=3Dhitcount:__l= at_8125_2=3Dcommon_timestamp.usecs-$__arg_8125_1:sort=3Dhitcount:size=3D204= 8:clock=3Dglobal:onmatch(syscalls.sys_enter_futex).trace(futex_wait,$__lat_= 8125_2) [active] syscalls:sys_enter_futex hist:keys=3Dcommon_pid:vals=3Dhitcount:__a= rg_8125_1=3Dcommon_timestamp.usecs:sort=3Dhitcount:size=3D2048:clock=3Dglob= al [active] ~# cat /sys/kernel/tracing/show_event_filters synthetic:futex_wait (lat > 100) page_pool:page_pool_state_release (pfn =3D=3D 1) Signed-off-by: Steven Rostedt (Google) Acked-by: Masami Hiramatsu (Google) Reviewed-by: Aaron Tomlin --- [ This is based on top of these patches: https://lore.kernel.org/linux-trace-kernel/20260105142939.2655342-1-ato= mlin@atomlin.com/ ] kernel/trace/trace_events.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 36936697fa2a..f372a6374164 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -1662,6 +1662,18 @@ static void t_stop(struct seq_file *m, void *p) mutex_unlock(&event_mutex); } =20 +static int get_call_len(struct trace_event_call *call) +{ + int len; + + /* Get the length of ":" */ + len =3D strlen(call->class->system) + 1; + len +=3D strlen(trace_event_name(call)); + + /* Set the index to 32 bytes to separate event from data */ + return len >=3D 32 ? 1 : 32 - len; +} + /** * t_show_filters - seq_file callback to display active event filters * @m: The seq_file interface for formatted output @@ -1676,14 +1688,17 @@ static int t_show_filters(struct seq_file *m, void = *v) struct trace_event_file *file =3D v; struct trace_event_call *call =3D file->event_call; struct event_filter *filter; + int len; =20 guard(rcu)(); filter =3D rcu_dereference(file->filter); if (!filter || !filter->filter_string) return 0; =20 - seq_printf(m, "%s:%s\t%s\n", call->class->system, - trace_event_name(call), filter->filter_string); + len =3D get_call_len(call); + + seq_printf(m, "%s:%s%*.s%s\n", call->class->system, + trace_event_name(call), len, "", filter->filter_string); =20 return 0; } @@ -1702,6 +1717,7 @@ static int t_show_triggers(struct seq_file *m, void *= v) struct trace_event_file *file =3D v; struct trace_event_call *call =3D file->event_call; struct event_trigger_data *data; + int len; =20 /* * The event_mutex is held by t_start(), protecting the @@ -1710,9 +1726,11 @@ static int t_show_triggers(struct seq_file *m, void = *v) if (list_empty(&file->triggers)) return 0; =20 + len =3D get_call_len(call); + list_for_each_entry_rcu(data, &file->triggers, list) { - seq_printf(m, "%s:%s\t", call->class->system, - trace_event_name(call)); + seq_printf(m, "%s:%s%*.s", call->class->system, + trace_event_name(call), len, ""); =20 data->cmd_ops->print(m, data); } --=20 2.51.0