linux-kernel - [PATCH AUTOSEL 5.15 02/10] tools/power turbostat: Fix Bzy

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Message-ID: <20240422231929.1611680-2-sashal@kernel.org>
Date: Mon, 22 Apr 2024 19:19:15 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Peng Liu <liupeng17@...ovo.com>,
	Len Brown <len.brown@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	lenb@...nel.org,
	linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 02/10] tools/power turbostat: Fix Bzy_MHz documentation typo

From: Peng Liu <liupeng17@...ovo.com>

[ Upstream commit 0b13410b52c4636aacb6964a4253a797c0fa0d16 ]

The code calculates Bzy_MHz by multiplying TSC_delta * APERF_delta/MPERF_delta
The man page erroneously showed that TSC_delta was divided.

Signed-off-by: Peng Liu <liupeng17@...ovo.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/power/x86/turbostat/turbostat.8 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index b3d4bf08e70b1..f382cd53cb4e8 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -322,7 +322,7 @@ below the processor's base frequency.
 
 Busy% = MPERF_delta/TSC_delta
 
-Bzy_MHz = TSC_delta/APERF_delta/MPERF_delta/measurement_interval
+Bzy_MHz = TSC_delta*APERF_delta/MPERF_delta/measurement_interval
 
 Note that these calculations depend on TSC_delta, so they
 are not reliable during intervals when TSC_MHz is not running at the base frequency.
-- 
2.43.0