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| Filename | Latest commit message | Latest commit date |
|---|---|---|
6f4354ca0c
[ Upstream commit 9d6c0e58514f8b57cd9c2c755e41623d6a966025 ]
Commit 'cpupower: Make TSC read per CPU for Mperf monitor' (c2adb1877b7)
changes TSC counter reads per cpu, but left time diff global (from start
of all cpus to end of all cpus), thus diff(time) is too large for a
cpu's tsc counting, resulting in far less than acutal TSC_Mhz and thus
`cpupower monitor` showing far less than actual cpu realtime frequency.
/proc/cpuinfo shows frequency:
cat /proc/cpuinfo | egrep -e 'processor' -e 'MHz'
...
processor : 171
cpu MHz : 4108.498
...
before fix (System 100% busy):
| Mperf || Idle_Stats
CPU| C0 | Cx | Freq || POLL | C1 | C2
171| 0.77| 99.23| 2279|| 0.00| 0.00| 0.00
after fix (System 100% busy):
| Mperf || Idle_Stats
CPU| C0 | Cx | Freq || POLL | C1 | C2
171| 0.46| 99.54| 4095|| 0.00| 0.00| 0.00
Fixes: c2adb1877b76 ("cpupower: Make TSC read per CPU for Mperf monitor")
Signed-off-by: He Rongguang <herongguang@linux.alibaba.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.