Loading Documentation/cpu-freq/cpufreq-stats.txt 0 → 100644 +128 −0 Original line number Diff line number Diff line CPU frequency and voltage scaling statictics in the Linux(TM) kernel L i n u x c p u f r e q - s t a t s d r i v e r - information for users - Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Contents 1. Introduction 2. Statistics Provided (with example) 3. Configuring cpufreq-stats 1. Introduction cpufreq-stats is a driver that provices CPU frequency statistics for each CPU. This statistics is provided in /sysfs as a bunch of read_only interfaces. This interface (when configured) will appear in a seperate directory under cpufreq in /sysfs (<sysfs root>/devices/system/cpu/cpuX/cpufreq/stats/) for each CPU. Various statistics will form read_only files under this directory. This driver is designed to be independent of any particular cpufreq_driver that may be running on your CPU. So, it will work with any cpufreq_driver. 2. Statistics Provided (with example) cpufreq stats provides following statistics (explained in detail below). - time_in_state - total_trans - trans_table All the statistics will be from the time the stats driver has been inserted to the time when a read of a particular statistic is done. Obviously, stats driver will not have any information about the the frequcny transitions before the stats driver insertion. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l total 0 drwxr-xr-x 2 root root 0 May 14 16:06 . drwxr-xr-x 3 root root 0 May 14 15:58 .. -r--r--r-- 1 root root 4096 May 14 16:06 time_in_state -r--r--r-- 1 root root 4096 May 14 16:06 total_trans -r--r--r-- 1 root root 4096 May 14 16:06 trans_table -------------------------------------------------------------------------------- - time_in_state This gives the amount of time spent in each of the frequencies supported by this CPU. The cat output will have "<frequency> <time>" pair in each line, which will mean this CPU spent <time> usertime units of time at <frequency>. Output will have one line for each of the supported freuencies. usertime units here is 10mS (similar to other time exported in /proc). -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat time_in_state 3600000 2089 3400000 136 3200000 34 3000000 67 2800000 172488 -------------------------------------------------------------------------------- - total_trans This gives the total number of frequency transitions on this CPU. The cat output will have a single count which is the total number of frequency transitions. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat total_trans 20 -------------------------------------------------------------------------------- - trans_table This will give a fine grained information about all the CPU frequency transitions. The cat output here is a two dimensional matrix, where an entry <i,j> (row i, column j) represents the count of number of transitions from Freq_i to Freq_j. Freq_i is in descending order with increasing rows and Freq_j is in descending order with increasing columns. The output here also contains the actual freq values for each row and column for better readability. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat trans_table From : To : 3600000 3400000 3200000 3000000 2800000 3600000: 0 5 0 0 0 3400000: 4 0 2 0 0 3200000: 0 1 0 2 0 3000000: 0 0 1 0 3 2800000: 0 0 0 2 0 -------------------------------------------------------------------------------- 3. Configuring cpufreq-stats To configure cpufreq-stats in your kernel Config Main Menu Power management options (ACPI, APM) ---> CPU Frequency scaling ---> [*] CPU Frequency scaling <*> CPU frequency translation statistics [*] CPU frequency translation statistics details "CPU Frequency scaling" (CONFIG_CPU_FREQ) should be enabled to configure cpufreq-stats. "CPU frequency translation statistics" (CONFIG_CPU_FREQ_STAT) provides the basic statistics which includes time_in_state and total_trans. "CPU frequency translation statistics details" (CONFIG_CPU_FREQ_STAT_DETAILS) provides fine grained cpufreq stats by trans_table. The reason for having a seperate config option for trans_table is: - trans_table goes against the traditional /sysfs rule of one value per interface. It provides a whole bunch of value in a 2 dimensional matrix form. Once these two options are enabled and your CPU supports cpufrequency, you will be able to see the CPU frequency statistics in /sysfs. Documentation/cpusets.txt +1 −2 Original line number Diff line number Diff line Loading @@ -252,8 +252,7 @@ in a tasks processor placement. There is an exception to the above. If hotplug funtionality is used to remove all the CPUs that are currently assigned to a cpuset, then the kernel will automatically update the cpus_allowed of all tasks attached to CPUs in that cpuset with the online CPUs of the nearest parent cpuset that still has some CPUs online. When memory tasks attached to CPUs in that cpuset to allow all CPUs. When memory hotplug functionality for removing Memory Nodes is available, a similar exception is expected to apply there as well. In general, the kernel prefers to violate cpuset placement, over starving a task Loading Documentation/x86_64/boot-options.txt +3 −0 Original line number Diff line number Diff line Loading @@ -25,6 +25,9 @@ APICs noapictimer Don't set up the APIC timer no_timer_check Don't check the IO-APIC timer. This can work around problems with incorrect timer initialization on some boards. Early Console syntax: earlyprintk=vga Loading MAINTAINERS +8 −2 Original line number Diff line number Diff line Loading @@ -239,6 +239,12 @@ L: linux-usb-devel@lists.sourceforge.net W: http://www.linux-usb.org/SpeedTouch/ S: Maintained ALI1563 I2C DRIVER P: Rudolf Marek M: r.marek@sh.cvut.cz L: sensors@stimpy.netroedge.com S: Maintained ALPHA PORT P: Richard Henderson M: rth@twiddle.net Loading Loading @@ -1023,8 +1029,8 @@ W: http://www.ia64-linux.org/ S: Maintained SN-IA64 (Itanium) SUB-PLATFORM P: Jesse Barnes M: jbarnes@sgi.com P: Greg Edwards M: edwardsg@sgi.com L: linux-altix@sgi.com L: linux-ia64@vger.kernel.org W: http://www.sgi.com/altix Loading Makefile +1 −1 Original line number Diff line number Diff line VERSION = 2 PATCHLEVEL = 6 SUBLEVEL = 12 EXTRAVERSION =-rc4 EXTRAVERSION =-rc5 NAME=Woozy Numbat # *DOCUMENTATION* Loading Loading
Documentation/cpu-freq/cpufreq-stats.txt 0 → 100644 +128 −0 Original line number Diff line number Diff line CPU frequency and voltage scaling statictics in the Linux(TM) kernel L i n u x c p u f r e q - s t a t s d r i v e r - information for users - Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Contents 1. Introduction 2. Statistics Provided (with example) 3. Configuring cpufreq-stats 1. Introduction cpufreq-stats is a driver that provices CPU frequency statistics for each CPU. This statistics is provided in /sysfs as a bunch of read_only interfaces. This interface (when configured) will appear in a seperate directory under cpufreq in /sysfs (<sysfs root>/devices/system/cpu/cpuX/cpufreq/stats/) for each CPU. Various statistics will form read_only files under this directory. This driver is designed to be independent of any particular cpufreq_driver that may be running on your CPU. So, it will work with any cpufreq_driver. 2. Statistics Provided (with example) cpufreq stats provides following statistics (explained in detail below). - time_in_state - total_trans - trans_table All the statistics will be from the time the stats driver has been inserted to the time when a read of a particular statistic is done. Obviously, stats driver will not have any information about the the frequcny transitions before the stats driver insertion. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l total 0 drwxr-xr-x 2 root root 0 May 14 16:06 . drwxr-xr-x 3 root root 0 May 14 15:58 .. -r--r--r-- 1 root root 4096 May 14 16:06 time_in_state -r--r--r-- 1 root root 4096 May 14 16:06 total_trans -r--r--r-- 1 root root 4096 May 14 16:06 trans_table -------------------------------------------------------------------------------- - time_in_state This gives the amount of time spent in each of the frequencies supported by this CPU. The cat output will have "<frequency> <time>" pair in each line, which will mean this CPU spent <time> usertime units of time at <frequency>. Output will have one line for each of the supported freuencies. usertime units here is 10mS (similar to other time exported in /proc). -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat time_in_state 3600000 2089 3400000 136 3200000 34 3000000 67 2800000 172488 -------------------------------------------------------------------------------- - total_trans This gives the total number of frequency transitions on this CPU. The cat output will have a single count which is the total number of frequency transitions. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat total_trans 20 -------------------------------------------------------------------------------- - trans_table This will give a fine grained information about all the CPU frequency transitions. The cat output here is a two dimensional matrix, where an entry <i,j> (row i, column j) represents the count of number of transitions from Freq_i to Freq_j. Freq_i is in descending order with increasing rows and Freq_j is in descending order with increasing columns. The output here also contains the actual freq values for each row and column for better readability. -------------------------------------------------------------------------------- <mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # cat trans_table From : To : 3600000 3400000 3200000 3000000 2800000 3600000: 0 5 0 0 0 3400000: 4 0 2 0 0 3200000: 0 1 0 2 0 3000000: 0 0 1 0 3 2800000: 0 0 0 2 0 -------------------------------------------------------------------------------- 3. Configuring cpufreq-stats To configure cpufreq-stats in your kernel Config Main Menu Power management options (ACPI, APM) ---> CPU Frequency scaling ---> [*] CPU Frequency scaling <*> CPU frequency translation statistics [*] CPU frequency translation statistics details "CPU Frequency scaling" (CONFIG_CPU_FREQ) should be enabled to configure cpufreq-stats. "CPU frequency translation statistics" (CONFIG_CPU_FREQ_STAT) provides the basic statistics which includes time_in_state and total_trans. "CPU frequency translation statistics details" (CONFIG_CPU_FREQ_STAT_DETAILS) provides fine grained cpufreq stats by trans_table. The reason for having a seperate config option for trans_table is: - trans_table goes against the traditional /sysfs rule of one value per interface. It provides a whole bunch of value in a 2 dimensional matrix form. Once these two options are enabled and your CPU supports cpufrequency, you will be able to see the CPU frequency statistics in /sysfs.
Documentation/cpusets.txt +1 −2 Original line number Diff line number Diff line Loading @@ -252,8 +252,7 @@ in a tasks processor placement. There is an exception to the above. If hotplug funtionality is used to remove all the CPUs that are currently assigned to a cpuset, then the kernel will automatically update the cpus_allowed of all tasks attached to CPUs in that cpuset with the online CPUs of the nearest parent cpuset that still has some CPUs online. When memory tasks attached to CPUs in that cpuset to allow all CPUs. When memory hotplug functionality for removing Memory Nodes is available, a similar exception is expected to apply there as well. In general, the kernel prefers to violate cpuset placement, over starving a task Loading
Documentation/x86_64/boot-options.txt +3 −0 Original line number Diff line number Diff line Loading @@ -25,6 +25,9 @@ APICs noapictimer Don't set up the APIC timer no_timer_check Don't check the IO-APIC timer. This can work around problems with incorrect timer initialization on some boards. Early Console syntax: earlyprintk=vga Loading
MAINTAINERS +8 −2 Original line number Diff line number Diff line Loading @@ -239,6 +239,12 @@ L: linux-usb-devel@lists.sourceforge.net W: http://www.linux-usb.org/SpeedTouch/ S: Maintained ALI1563 I2C DRIVER P: Rudolf Marek M: r.marek@sh.cvut.cz L: sensors@stimpy.netroedge.com S: Maintained ALPHA PORT P: Richard Henderson M: rth@twiddle.net Loading Loading @@ -1023,8 +1029,8 @@ W: http://www.ia64-linux.org/ S: Maintained SN-IA64 (Itanium) SUB-PLATFORM P: Jesse Barnes M: jbarnes@sgi.com P: Greg Edwards M: edwardsg@sgi.com L: linux-altix@sgi.com L: linux-ia64@vger.kernel.org W: http://www.sgi.com/altix Loading
Makefile +1 −1 Original line number Diff line number Diff line VERSION = 2 PATCHLEVEL = 6 SUBLEVEL = 12 EXTRAVERSION =-rc4 EXTRAVERSION =-rc5 NAME=Woozy Numbat # *DOCUMENTATION* Loading
