From mboxrd@z Thu Jan 1 00:00:00 1970 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 6C84A1DDA2E; Mon, 6 Jan 2025 13:24:48 +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=1736169888; cv=none; b=BmE01uThYGLj82UdbJfT8bWWuEznPXKs30+QUw4AsrE581he4BYmB80W6elkO26vtM25ozFo9/eziLmsCuFkwOWeTzCMwAT8TgOGl/r/RaU6JaaTOTdpb7i5TyJrdFvd8OS1Qas5Pc9VM5/G0wvlV+v0Lj2r+iyQ6lPyzCOoVNY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736169888; c=relaxed/simple; bh=ExWqDD7WEFcCsYzyUGTWC1ki7ltdi+y3LVg5hPlWiuE=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=a+7FhsUOsbLUX34DwZQNveUl+KX2cLPkn75heUiHi567iCORsbrcvZQT4g7vYikYFhnDGvf804FjVytiADllRvCja198wm5/E4Q7dhEyBXXiypQDKxwhp4Uj5MWz6cSEYTwlUGn7nPDp8VnudRwS+UjF0g0rm3bxWQMjUKrhe90= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qM33E4OM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qM33E4OM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 90669C4CED2; Mon, 6 Jan 2025 13:24:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736169888; bh=ExWqDD7WEFcCsYzyUGTWC1ki7ltdi+y3LVg5hPlWiuE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=qM33E4OM4XuzFr5dK36wdItkSgx9Libym6en3yLSGK25xTziEvA6J1UFmbfXRCAhk Y/LjWk3QjylAEz1x8s5Mx+f5LfHzVeR9v8L9kC7tLFiUHTPcV1HqaEIc4W+Ixm1J3g Y0S4pb9M1tvSDoWstMLIulB4USMxER/hfCSexYI/GHwCCbaW3a//gQPQQKGFQI49NF xblCvc9V4f8MKmwTLh+DzsurT+rq0kyDmzr+1529jK98slJ02y6Rq0h+HqXWoRuyZ9 SAjmCK3P74A5b7BzmVvFN5WHMVWVlILO6pkAojNPiRcQ3lpPvaCem8/zsNU//Y/l1d mRqnMRDRDbz/A== Date: Mon, 6 Jan 2025 22:24:44 +0900 From: Masami Hiramatsu (Google) To: Shrikanth Hegde Cc: rostedt@goodmis.org, mark.rutland@arm.com, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ftrace: print lazy preemption model Message-Id: <20250106222444.28141b2b05cb4c7906f5e91e@kernel.org> In-Reply-To: <20250103093647.575919-1-sshegde@linux.ibm.com> References: <20250103093647.575919-1-sshegde@linux.ibm.com> X-Mailer: Sylpheed 3.8.0beta1 (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-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 3 Jan 2025 15:06:47 +0530 Shrikanth Hegde wrote: > Print lazy preemption model in ftrace header when latency-format=1. > > 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) > Looks good to me. Acked-by: Masami Hiramatsu (Google) Thanks, > Signed-off-by: Shrikanth Hegde > --- > 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_iterator *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 */ > -- > 2.39.3 > -- Masami Hiramatsu (Google)