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| author | Giovanni Gherdovich <ggherdovich@suse.cz> | 2020-11-12 19:26:14 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-12-11 10:30:23 +0100 |
| commit | 3149cd55302748df771dc1c8c10f34b1cbce88ed (patch) | |
| tree | 0267ae86e5e37fe85c50b91e15b3d1efda85c440 /arch/x86/kernel/smpboot.c | |
| parent | 976df7e5730e3ec8a7e192c09c10ce6e8db07e65 (diff) | |
| download | linux-3149cd55302748df771dc1c8c10f34b1cbce88ed.tar.bz2 | |
x86: Print ratio freq_max/freq_base used in frequency invariance calculations
The value freq_max/freq_base is a fundamental component of frequency
invariance calculations. It may come from a variety of sources such as MSRs
or ACPI data, tracking it down when troubleshooting a system could be
non-trivial. It is worth saving it in the kernel logs.
# dmesg | grep 'Estimated ratio of average max'
[ 14.024036] smpboot: Estimated ratio of average max frequency by base frequency (times 1024): 1289
Signed-off-by: Giovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20201112182614.10700-4-ggherdovich@suse.cz
Diffstat (limited to 'arch/x86/kernel/smpboot.c')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index c5dd5f6199d9..3577bb756d64 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -2110,6 +2110,7 @@ static void init_freq_invariance(bool secondary, bool cppc_ready) if (ret) { init_counter_refs(); static_branch_enable(&arch_scale_freq_key); + pr_info("Estimated ratio of average max frequency by base frequency (times 1024): %llu\n", arch_max_freq_ratio); } else { pr_debug("Couldn't determine max cpu frequency, necessary for scale-invariant accounting.\n"); } |