From nobody Tue Nov 26 06:39:26 2024 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 AA7731FAC3B; Mon, 21 Oct 2024 15:13:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729523595; cv=none; b=pTY/KacfYdzctliPY0ZffwmDD6iR6q1lsB+wwAChABJZc3+EFlB5eYBjlES/rxhQnsdxiBwLrDc+fKjBZwWjgu4HQpPs19vecHtcHhQ6mtPIL8hEibo9FgXTl+d5mnx0oPXOvR8XueMZ08jcJTS0FQ5Mnuffo3ub3fJnYynmzFk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729523595; c=relaxed/simple; bh=QjIvZlCtVBiBsmsnr8cISyDYLEv8628810IVww1WNSg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L4LspOB1TaSomrWA4IBdgN4kgl/dx7bqWPV1ZxZ6S8yHCDWv0cqzgzyN4/Z4CSW6ME4Ze+PoyJGFcHAbS+lMXSVbwNXByWu6Ek/q0QXrgqBXC9n3ci8097HF/adwxRDIvrMxTfhEj+nUuE9wIw5JgEK8uIYXwPUnp3kjAohTenc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=0HF2jZDA; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=WeY5DLKy; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="0HF2jZDA"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="WeY5DLKy" From: Sebastian Andrzej Siewior DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1729523587; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HaEaP85s+bDV/FR3UNIae3NhDHTKAM5R8mgLmDl9h4A=; b=0HF2jZDAXbmVVSgQ6C909u3k9wAUIjb5QwKmPFALR1hwemXqQft7BwtjujT4D1xRW460GW uwiJ5fGXhxuNtxopfV+jG//m2aUk6ugATphTWuvJ8Q69NVo0nFJ3BULKvcghCV7v8Dl5Jq Q9LlejV0LMuU7kuGyMxDs48z1UrkfVKkGnrtoH25+HWx7VuOlF++AMp/EuKINMQTqmgcbR dx43OP5ikRlFIc03+PBTulOLqUt6zssS7XGfpGW4rmRHK2VKN5yn64FJWjYQ7Fo2KvBwV9 7WO2D4F2jDtuUIouWHi4jRhw2Hefs+ThkR4ukmUT8zBvABStt2ICTXiOotTKdA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1729523587; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HaEaP85s+bDV/FR3UNIae3NhDHTKAM5R8mgLmDl9h4A=; b=WeY5DLKyyb2I3Br33YRRtuMkTu3/UaKNldq7aX4F8R4F7RrE1hS+3GyQJaTrmHX8H0HGhP 58by9NFPNJIm1mCw== To: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Peter Zijlstra , tglx@linutronix.de, mingo@kernel.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, ankur.a.arora@oracle.com, efault@gmx.de, Masami Hiramatsu , Mathieu Desnoyers , Sebastian Andrzej Siewior Subject: [PATCH v2 2/3] tracing: Record task flag NEED_RESCHED_LAZY. Date: Mon, 21 Oct 2024 17:08:41 +0200 Message-ID: <20241021151257.102296-3-bigeasy@linutronix.de> In-Reply-To: <20241021151257.102296-1-bigeasy@linutronix.de> References: <20241021151257.102296-1-bigeasy@linutronix.de> 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 Content-Type: text/plain; charset="utf-8" From: Thomas Gleixner The scheduler added NEED_RESCHED_LAZY scheduling. Record this state as part of trace flags and expose it in the need_resched field. Record and expose NEED_RESCHED_LAZY. [bigeasy: Commit description, documentation bits.] Reviewed-by: Ankur Arora Reviewed-by: Steven Rostedt (Google) Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior --- Documentation/trace/ftrace.rst | 4 ++++ include/linux/trace_events.h | 1 + kernel/trace/trace.c | 2 ++ kernel/trace/trace_output.c | 14 +++++++++++++- 4 files changed, 20 insertions(+), 1 deletion(-) --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -1036,9 +1036,13 @@ explains which is which. be printed here. =20 need-resched: + - 'B' all, TIF_NEED_RESCHED, PREEMPT_NEED_RESCHED and TIF_RESCHED_LAZY is= set, - 'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set, - 'n' only TIF_NEED_RESCHED is set, - 'p' only PREEMPT_NEED_RESCHED is set, + - 'L' borg PREEMPT_NEED_RESCHED and TIF_RESCHED_LAZY is set, + - 'b' borg TIF_NEED_RESCHED and TIF_RESCHED_LAZY is set, + - 'l' only TIF_RESCHED_LAZY is set - '.' otherwise. =20 hardirq/softirq: --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -185,6 +185,7 @@ unsigned int tracing_gen_ctx_irq_test(un enum trace_flag_type { TRACE_FLAG_IRQS_OFF =3D 0x01, TRACE_FLAG_NEED_RESCHED =3D 0x02, + TRACE_FLAG_NEED_RESCHED_LAZY =3D 0x04, TRACE_FLAG_HARDIRQ =3D 0x08, TRACE_FLAG_SOFTIRQ =3D 0x10, TRACE_FLAG_PREEMPT_RESCHED =3D 0x20, --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2544,6 +2544,8 @@ unsigned int tracing_gen_ctx_irq_test(un trace_flags |=3D TRACE_FLAG_NEED_RESCHED; if (test_preempt_need_resched()) trace_flags |=3D TRACE_FLAG_PREEMPT_RESCHED; + if (IS_ENABLED(CONFIG_ARCH_HAS_PREEMPT_LAZY) && tif_test_bit(TIF_NEED_RES= CHED_LAZY)) + trace_flags |=3D TRACE_FLAG_NEED_RESCHED_LAZY; return (trace_flags << 16) | (min_t(unsigned int, pc & 0xff, 0xf)) | (min_t(unsigned int, migration_disable_value(), 0xf)) << 4; } --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -463,17 +463,29 @@ int trace_print_lat_fmt(struct trace_seq !IS_ENABLED(CONFIG_TRACE_IRQFLAGS_SUPPORT) ? 'X' : '.'; =20 - switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | + switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED= _LAZY | TRACE_FLAG_PREEMPT_RESCHED)) { + case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_= PREEMPT_RESCHED: + need_resched =3D 'B'; + break; case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: need_resched =3D 'N'; break; + case TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED: + need_resched =3D 'L'; + break; + case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY: + need_resched =3D 'b'; + break; case TRACE_FLAG_NEED_RESCHED: need_resched =3D 'n'; break; case TRACE_FLAG_PREEMPT_RESCHED: need_resched =3D 'p'; break; + case TRACE_FLAG_NEED_RESCHED_LAZY: + need_resched =3D 'l'; + break; default: need_resched =3D '.'; break;