45 lines
1.7 KiB
Diff
45 lines
1.7 KiB
Diff
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From 259178cd356109c861bf41ec32cea905faeabbca Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 25 May 2021 13:23:39 +0200
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Subject: lscpu: read MHZ from /sys/.../cpufreq/scaling_cur_freq
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This is more portable and provides more stable results than
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/proc/cpuinfo.
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Addresses: https://issues.redhat.com/browse/RHEL-12783
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Upstream: http://github.com/util-linux/util-linux/commit/f2d08d4ddc9bc601107df28dd8e4598cf2e0b420
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Fixes: https://github.com/karelzak/util-linux/pull/1317
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Co-Author: Thomas Weißschuh
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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sys-utils/lscpu-topology.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/sys-utils/lscpu-topology.c b/sys-utils/lscpu-topology.c
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index bba727643..fe4da7cd5 100644
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--- a/sys-utils/lscpu-topology.c
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+++ b/sys-utils/lscpu-topology.c
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@@ -551,6 +551,16 @@ static int read_mhz(struct lscpu_cxt *cxt, struct lscpu_cpu *cpu)
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if (ul_path_readf_s32(sys, &mhz, "cpu%d/cpufreq/cpuinfo_min_freq", num) == 0)
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cpu->mhz_min_freq = (float) mhz / 1000;
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+ /* The default current-frequency value comes is from /proc/cpuinfo (if
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+ * available). This /proc value is usually based on MSR registers
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+ * (APERF/APERF) and it changes pretty often. It seems better to read
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+ * frequency from cpufreq subsystem that provides the current frequency
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+ * for the current policy. There is also cpuinfo_cur_freq in sysfs, but
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+ * it's not always available.
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+ */
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+ if (ul_path_readf_s32(sys, &mhz, "cpu%d/cpufreq/scaling_cur_freq", num) == 0)
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+ cpu->mhz_cur_freq = (float) mhz / 1000;
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+
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if (cpu->type && (cpu->mhz_min_freq || cpu->mhz_max_freq))
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cpu->type->has_freq = 1;
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--
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2.43.0
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