linux-kernel - [PATCH v1] perf vendor power9 nest metrics: Correct unit from MB to MiB

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20251031162637.1456191-1-irogers@google.com>
Date: Fri, 31 Oct 2025 09:26:37 -0700
From: Ian Rogers <irogers@...gle.com>
To: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, Kajol Jain <kjain@...ux.ibm.com>, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf vendor power9 nest metrics: Correct unit from MB to MiB

6.1e-5 is very close to 1/16384, where 16384 is 2^14, i.e. a power of
2. When units are in powers of 2 the IEC unit is MiB (mebibytes)
rather than MB (megabytes) where the values are powers of 10. This
patch corrects the unit for uniformity and because such units may be
pattern matched against.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 .../perf/pmu-events/arch/powerpc/power9/nest_metrics.json | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json b/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
index 7a5d1bf543f8..8d028a7c2777 100644
--- a/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
+++ b/tools/perf/pmu-events/arch/powerpc/power9/nest_metrics.json
@@ -29,25 +29,25 @@
 	"MetricExpr" : "nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_RD_DISP_PORT23@",
 	"MetricName" : "mcs01-read",
 	"MetricGroup" : "memory-bandwidth",
-	"ScaleUnit": "6.1e-5MB"
+	"ScaleUnit": "6.1e-5MiB"
     },
     {
 	"MetricExpr" : "nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_RD_DISP_PORT23@",
 	"MetricName" : "mcs23-read",
 	"MetricGroup" : "memory-bandwidth",
-	"ScaleUnit": "6.1e-5MB"
+	"ScaleUnit": "6.1e-5MiB"
     },
     {
 	"MetricExpr" : "nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT01@ + nest_mcs01_imc@...MCS01_128B_WR_DISP_PORT23@",
 	"MetricName" : "mcs01-write",
 	"MetricGroup" : "memory-bandwidth",
-	"ScaleUnit": "6.1e-5MB"
+	"ScaleUnit": "6.1e-5MiB"
     },
     {
 	"MetricExpr" : "nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT01@ + nest_mcs23_imc@...MCS23_128B_WR_DISP_PORT23@",
 	"MetricName" : "mcs23-write",
 	"MetricGroup" : "memory-bandwidth",
-	"ScaleUnit": "6.1e-5MB"
+	"ScaleUnit": "6.1e-5MiB"
     },
     {
 	"MetricExpr" : "nest_powerbus0_imc@...PB_CYC@",
-- 
2.51.1.930.gacf6e81ea2-goog