From nobody Wed Dec 17 06:12:59 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 77DFE155A30 for ; Tue, 14 Jan 2025 14:53:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736866408; cv=none; b=B3Dct3VSw9dg2/1uYj0qbPgEbq4lFTd6lztpnDSNcUeEt3w6bBKSgfWEdcGOtnRgxfDZBLBb8XZODhxApbZ9wJJ9y3lASo3aowL3jN/VTtMQuwxSX3drDuhYG4xZwsFLYNheXzzrfwlT5L88Rp0gJvbwW9Oj2cqQPQ6fW1jFsj0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736866408; c=relaxed/simple; bh=j9T3IQphGkHw9VfRu56j3GmijrjKc4PxWYzbCoJ0S7k=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=dnYcMMq006FI0/+tflSr44mS6lVK/hkfh+d06gr8SEv5jYl8ixvwM3FBQVCx273EEWVKsmrpeJ/EI+yB3Vo4AZ0s1hMOtPuDSockj/2WNi7GEHAiEJ4EyeXug6ZTDKMA0VGi1rSppi0o4VlL/KjJwYgeRtz5nzE4203aLmR/yDo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE353C4CEE8; Tue, 14 Jan 2025 14:53:26 +0000 (UTC) Received: from rostedt by gandalf with local (Exim 4.98) (envelope-from ) id 1tXiIK-00000000Fpn-1TsB; Tue, 14 Jan 2025 09:53:28 -0500 Message-ID: <20250114145328.130372281@goodmis.org> User-Agent: quilt/0.68 Date: Tue, 14 Jan 2025 09:53:15 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Shrikanth Hegde Subject: [for-linus][PATCH 2/2] tracing: Print lazy preemption model References: <20250114145313.452899098@goodmis.org> 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: Shrikanth Hegde Print lazy preemption model in ftrace header when latency-format=3D1. # cat /sys/kernel/debug/sched/preempt none voluntary full (lazy) Without patch: latency: 0 us, #232946/232946, CPU#40 | (M:unknown VP:0, KP:0, SP:0 HP:0 = #P:80) ^^^^^^^ With Patch: latency: 0 us, #1897938/25566788, CPU#16 | (M:lazy VP:0, KP:0, SP:0 HP:0 = #P:80) ^^^^ Now that lazy preemption is part of the kernel, make sure the tracing infrastructure reflects that. Link: https://lore.kernel.org/20250103093647.575919-1-sshegde@linux.ibm.com Signed-off-by: Shrikanth Hegde Acked-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index f8aebcb01e62..b6e40e8791fa 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4122,6 +4122,7 @@ print_trace_header(struct seq_file *m, struct trace_i= terator *iter) preempt_model_none() ? "server" : preempt_model_voluntary() ? "desktop" : preempt_model_full() ? "preempt" : + preempt_model_lazy() ? "lazy" : preempt_model_rt() ? "preempt_rt" : "unknown", /* These are reserved for later use */ --=20 2.45.2