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| author |   Harry Pan <harry.pan@intel.com> | 2019-06-19 16:28:01 +0800 |
|---|---|---|
| committer |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-07-03 15:44:42 +0300 |
| commit | c09c6071310df430619df57d67e7ab59902f99ad (patch) | |
| tree | 48613d55f71fe163978a2bcf2712fdb99a9de0d5 /lib/random32.c | |
| parent | platform/x86: asus-wmi: Use dev_get_drvdata() (diff) | |
| download | linux-dev-c09c6071310df430619df57d67e7ab59902f99ad.tar.xz linux-dev-c09c6071310df430619df57d67e7ab59902f99ad.zip | |
platform/x86: intel_pmc_core: transform Pkg C-state residency from TSC ticks into microseconds
Refer to the Intel SDM Vol.4, the package C-state residency counters
of modern IA micro-architecture are all ticking in TSC frequency,
hence we can apply simple math to transform the ticks into microseconds.
i.e.,
residency (ms) = count / tsc_khz
residency (us) = count / tsc_khz * 1000
This also aligns to other sysfs debug entries of residency counter in
the same metric in microseconds, benefits reading and scripting.
v2: restore the accidentally deleted newline, no function change.
v3: apply kernel do_div() macro to calculate division
Signed-off-by: Harry Pan <harry.pan@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'lib/random32.c')
0 files changed, 0 insertions, 0 deletions