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d253d2a526
linux/drivers/cpufreq
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Brennan Shacklett d253d2a526 intel_pstate: Improve accuracy by not truncating until final result 
This patch addresses Bug 60727
(https://bugzilla.kernel.org/show_bug.cgi?id=60727)
which was due to the truncation of intermediate values in the
calculations, which causes the code to consistently underestimate the
current cpu frequency, specifically 100% cpu utilization was truncated
down to the setpoint of 97%. This patch fixes the problem by keeping
the results of all intermediate calculations as fixed point numbers
rather scaling them back and forth between integers and fixed point.

References: https://bugzilla.kernel.org/show_bug.cgi?id=60727
Signed-off-by: Brennan Shacklett <bpshacklett@gmail.com>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-22 01:15:38 +02:00
..
acpi-cpufreq.c acpi-cpufreq: skip loading acpi_cpufreq after intel_pstate 2013-09-25 03:19:09 +02:00
amd_freq_sensitivity.c cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor 2013-04-10 13:19:26 +02:00
arm_big_little_dt.c cpufreq: arm_big_little: remove device tree parsing for cpu nodes 2013-08-21 10:29:55 +01:00
arm_big_little.c cpufreq: arm-big-little: call CPUFREQ_POSTCHANGE notfier in error cases 2013-06-24 18:18:58 +05:30
arm_big_little.h cpufreq: ARM big LITTLE: Move cpu_to_cluster() to arm_big_little.h 2013-05-12 14:04:15 +02:00
at32ap-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
blackfin-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
cpufreq_conservative.c cpufreq: governors: Remove duplicate check of target freq in supported range 2013-08-28 22:03:02 +02:00
cpufreq_governor.c cpufreq: Don't use smp_processor_id() in preemptible context 2013-08-29 22:19:23 +02:00
cpufreq_governor.h cpufreq: governor: Fix typos in comments 2013-08-28 22:04:54 +02:00
cpufreq_ondemand.c cpufreq: governors: Remove duplicate check of target freq in supported range 2013-08-28 22:03:02 +02:00
cpufreq_performance.c cpufreq: Clean up header files included in the core 2013-08-07 23:34:09 +02:00
cpufreq_powersave.c cpufreq: Clean up header files included in the core 2013-08-07 23:34:09 +02:00
cpufreq_stats.c cpufreq: Fix wrong time unit conversion 2013-09-10 02:49:46 +02:00
cpufreq_userspace.c cpufreq: Fix minor formatting issues 2013-06-21 01:06:34 +02:00
cpufreq-cpu0.c cpufreq: cpufreq-cpu0: NULL is a valid regulator, part 2 2013-09-30 20:08:59 +02:00
cpufreq-nforce2.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
cpufreq.c cpufreq: check cpufreq driver is valid and cpufreq isn't disabled in cpufreq_get() 2013-09-25 03:24:02 +02:00
cris-artpec3-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
cris-etraxfs-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
davinci-cpufreq.c cpufreq: davinci: call CPUFREQ_POSTCHANGE notfier in error cases 2013-06-24 18:18:58 +05:30
dbx500-cpufreq.c cpufreq: delete __cpuinit usage from all cpufreq files 2013-07-14 19:36:57 -04:00
e_powersaver.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
elanfreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
exynos4x12-cpufreq.c arm-soc: cleanups 2013-02-21 14:58:40 -08:00
exynos4210-cpufreq.c arm-soc: cleanups 2013-02-21 14:58:40 -08:00
exynos5250-cpufreq.c arm-soc: cleanups 2013-02-21 14:58:40 -08:00
exynos5440-cpufreq.c cpufreq: exynos5440: Fix potential NULL pointer dereference 2013-09-25 03:25:58 +02:00
exynos-cpufreq.c Merge branch 'cpufreq-fixes' of git://git.linaro.org/people/vireshk/linux into pm-cpufreq 2013-08-14 22:22:57 +02:00
exynos-cpufreq.h cpufreq: fix EXYNOS drivers selection 2013-08-12 12:00:21 +05:30
freq_table.c cpufreq: Clean up header files included in the core 2013-08-07 23:34:09 +02:00
gx-suspmod.c cpufreq / gx: Fix gx_detect_chipset() __init attribute location 2013-08-14 22:24:23 +02:00
highbank-cpufreq.c cpufreq: highbank-cpufreq: remove device tree parsing for cpu nodes 2013-08-21 10:29:54 +01:00
ia64-acpi-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
imx6q-cpufreq.c cpufreq: imx6q-cpufreq: assign cpu_dev correctly to cpu0 device 2013-09-19 03:53:43 +02:00
integrator-cpufreq.c cpufreq: integrator: move cpufreq driver to drivers/cpufreq 2013-04-08 13:02:31 +02:00
intel_pstate.c intel_pstate: Improve accuracy by not truncating until final result 2013-10-22 01:15:38 +02:00
Kconfig cpufreq: Fix incorrect dependecies for ARM SA11xx drivers 2013-05-12 14:04:16 +02:00
Kconfig.arm cpufreq: fix EXYNOS drivers selection 2013-08-12 12:00:21 +05:30
Kconfig.powerpc Merge branch 'pm-cpufreq-assorted' into pm-cpufreq 2013-06-27 21:46:45 +02:00
Kconfig.x86 cpufreq: X86_AMD_FREQ_SENSITIVITY: select CPU_FREQ_TABLE 2013-06-18 13:53:11 +05:30
kirkwood-cpufreq.c Merge branch 'cpu_of_node' of git://linux-arm.org/linux-skn into pm-cpufreq-next 2013-08-23 00:57:19 +02:00
longhaul.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
longhaul.h cpufreq: delete __cpuinit usage from all cpufreq files 2013-07-14 19:36:57 -04:00
longrun.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
loongson2_cpufreq.c Merge back earlier 'pm-cpufreq' material 2013-08-14 22:21:16 +02:00
Makefile cpufreq: Remove unused APERF/MPERF support 2013-07-26 01:06:43 +02:00
maple-cpufreq.c Merge branch 'cpu_of_node' of git://linux-arm.org/linux-skn into pm-cpufreq-next 2013-08-23 00:57:19 +02:00
omap-cpufreq.c cpufreq: delete __cpuinit usage from all cpufreq files 2013-07-14 19:36:57 -04:00
p4-clockmod.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
pasemi-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
pcc-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
pmac32-cpufreq.c Merge branch 'cpu_of_node' of git://linux-arm.org/linux-skn into pm-cpufreq-next 2013-08-23 00:57:19 +02:00
pmac64-cpufreq.c Merge branch 'cpu_of_node' of git://linux-arm.org/linux-skn into pm-cpufreq-next 2013-08-23 00:57:19 +02:00
powernow-k6.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
powernow-k7.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
powernow-k7.h [CPUFREQ] Move x86 drivers to drivers/cpufreq/ 2011-05-19 18:51:07 -04:00
powernow-k8.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
powernow-k8.h cpufreq: Remove support for hardware P-state chips from powernow-k8 2012-09-09 22:05:30 +02:00
ppc_cbe_cpufreq_pervasive.c cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq_pmi.c cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
ppc_cbe_cpufreq.h cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc-corenet-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
pxa2xx-cpufreq.c cpufreq / pxa2xx: Fix pxa_cpufreq_init_voltages() __init attribute location 2013-08-14 22:24:23 +02:00
pxa3xx-cpufreq.c pxa3xx-cpufreq.c: Avoid using ARRAY_AND_SIZE(e) as a function argument 2013-08-14 22:24:23 +02:00
s3c24xx-cpufreq-debugfs.c cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq 2013-05-20 23:04:28 +09:00
s3c24xx-cpufreq.c cpufreq / s3c24xx: Fix s3c_cpufreq_initclks() __init attribute location 2013-08-14 22:24:24 +02:00
s3c64xx-cpufreq.c cpufreq: s3c64xx: Rename index to driver_data 2013-10-16 23:53:38 +02:00
s3c2410-cpufreq.c cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq 2013-05-20 23:04:28 +09:00
s3c2412-cpufreq.c cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq 2013-05-20 23:04:28 +09:00
s3c2416-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
s3c2440-cpufreq.c cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq 2013-05-20 23:04:28 +09:00
s5pv210-cpufreq.c cpufreq: Notify all policy->cpus in cpufreq_notify_transition() 2013-04-02 15:24:00 +02:00
sa1100-cpufreq.c cpufreq: sa11x0: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:24 +02:00
sa1110-cpufreq.c cpufreq: sa11x0: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:24 +02:00
sc520_freq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
sh-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
sparc-us2e-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
sparc-us3-cpufreq.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
spear-cpufreq.c cpufreq: SPEAr: Fix incorrect variable type 2013-09-30 20:05:43 +02:00
speedstep-centrino.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
speedstep-ich.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
speedstep-lib.c cpufreq: Add support for x86 cpuinfo auto loading v4 2012-01-26 16:49:06 -08:00
speedstep-lib.h [CPUFREQ] Move x86 drivers to drivers/cpufreq/ 2011-05-19 18:51:07 -04:00
speedstep-smi.c cpufreq: Drop the owner field from struct cpufreq_driver 2013-08-10 03:24:47 +02:00
tegra-cpufreq.c cpufreq: tegra: fix the wrong clock name 2013-08-23 21:58:28 +05:30
unicore2-cpufreq.c cpufreq: unicore2: Staticize local symbol 2013-08-14 22:24:24 +02:00