forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
linux-pinenote/tools/power/cpupower/utils/helpers/helpers.h
Thomas Renninger c8cfc3c6bf cpupower: Provide -c param for cpupower monitor to schedule process on all cores 
If an MSR based monitor is run in parallel this is not needed. This is the
default case on all/most Intel machines.

But when only sysfs info is read via cpupower monitor -m Idle_Stats (typically
the case for non root users) or when other monitors are PCI based (AMD),
Idle_Stats, read from sysfs can be totally bogus:

cpupower monitor -m Idle_Stats
PKG |CORE|CPU | POLL | C1-N | C3-N | C6-N
   0|   0|   0|  0.00|  0.00|  0.24| 99.81
   0|   0|  32|  0.00|  0.00|  0.00| 100.7
...
   0|  17|  20|  0.00|  0.00|  0.00| 173.1
   0|  17|  52|  0.00|  0.00|  0.07| 173.0
   0|  18|  68|  0.00|  0.00|  0.00|  0.00
   0|  18|  76|  0.00|  0.00|  0.00|  0.00
...

With the -c option all cores are woken up and the kernel
did update cpuidle statistics before reading out sysfs.
This causes some overhead. Therefore avoid if possible, use
if needed:

cpupower monitor -c -m Idle_Stats
PKG |CORE|CPU | POLL | C1-N | C3-N | C6-N
   0|   0|   0|  0.00|  0.00|  0.00| 100.2
   0|   0|  32|  0.00|  0.00|  0.00| 100.2
...
   0|   8|   8|  0.00|  0.00|  0.00| 99.82
   0|   8|  40|  0.00|  0.00|  0.00| 99.81
   0|   9|  24|  0.00|  0.00|  0.00| 100.3
   0|   9|  56|  0.00|  0.00|  0.00| 100.2
   0|  16|   4|  0.00|  0.00|  0.00| 99.75
   0|  16|  36|  0.00|  0.00|  0.00| 99.38
...

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2012-11-27 23:07:20 +01:00

195 lines
5.8 KiB
C
Raw Blame History

/*
* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Miscellaneous helpers which do not fit or are worth
* to put into separate headers
*/
#ifndef __CPUPOWERUTILS_HELPERS__
#define __CPUPOWERUTILS_HELPERS__
#include <libintl.h>
#include <locale.h>
#include "helpers/bitmask.h"
/* Internationalization ****************************/
#ifdef NLS
#define _(String) gettext(String)
#ifndef gettext_noop
#define gettext_noop(String) String
#endif
#define N_(String) gettext_noop(String)
#else /* !NLS */
#define _(String) String
#define N_(String) String
#endif
/* Internationalization ****************************/
extern int run_as_root;
extern struct bitmask *cpus_chosen;
/* Global verbose (-d) stuff *********************************/
/*
* define DEBUG via global Makefile variable
* Debug output is sent to stderr, do:
* cpupower monitor 2>/tmp/debug
* to split debug output away from normal output
*/
#ifdef DEBUG
extern int be_verbose;
#define dprint(fmt, ...) { \
if (be_verbose) { \
fprintf(stderr, "%s: " fmt, \
__func__, ##__VA_ARGS__); \
} \
}
#else
static inline void dprint(const char *fmt, ...) { }
#endif
extern int be_verbose;
/* Global verbose (-v) stuff *********************************/
/* cpuid and cpuinfo helpers **************************/
enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
X86_VENDOR_AMD, X86_VENDOR_MAX};
#define CPUPOWER_CAP_INV_TSC 0x00000001
#define CPUPOWER_CAP_APERF 0x00000002
#define CPUPOWER_CAP_AMD_CBP 0x00000004
#define CPUPOWER_CAP_PERF_BIAS 0x00000008
#define CPUPOWER_CAP_HAS_TURBO_RATIO 0x00000010
#define CPUPOWER_CAP_IS_SNB 0x00000020
#define CPUPOWER_CAP_INTEL_IDA 0x00000040
#define MAX_HW_PSTATES 10
struct cpupower_cpu_info {
enum cpupower_cpu_vendor vendor;
unsigned int family;
unsigned int model;
unsigned int stepping;
/* CPU capabilities read out from cpuid */
unsigned long long caps;
};
/* get_cpu_info
*
* Extract CPU vendor, family, model, stepping info from /proc/cpuinfo
*
* Returns 0 on success or a negativ error code
* Only used on x86, below global's struct values are zero/unknown on
* other archs
*/
extern int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info);
extern struct cpupower_cpu_info cpupower_cpu_info;
/* cpuid and cpuinfo helpers **************************/
struct cpuid_core_info {
int pkg;
int core;
int cpu;
/* flags */
unsigned int is_online:1;
};
/* CPU topology/hierarchy parsing ******************/
struct cpupower_topology {
/* Amount of CPU cores, packages and threads per core in the system */
unsigned int cores;
unsigned int pkgs;
unsigned int threads; /* per core */
/* Array gets mallocated with cores entries, holding per core info */
struct cpuid_core_info *core_info;
};
extern int get_cpu_topology(struct cpupower_topology *cpu_top);
extern void cpu_topology_release(struct cpupower_topology cpu_top);
/* CPU topology/hierarchy parsing ******************/
/* X86 ONLY ****************************************/
#if defined(__i386__) || defined(__x86_64__)
#include <pci/pci.h>
/* Read/Write msr ****************************/
extern int read_msr(int cpu, unsigned int idx, unsigned long long *val);
extern int write_msr(int cpu, unsigned int idx, unsigned long long val);
extern int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val);
extern int msr_intel_get_perf_bias(unsigned int cpu);
extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
/* Read/Write msr ****************************/
/* PCI stuff ****************************/
extern int amd_pci_get_num_boost_states(int *active, int *states);
extern struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain,
int bus, int slot, int func, int vendor,
int dev);
extern struct pci_dev *pci_slot_func_init(struct pci_access **pacc,
int slot, int func);
/* PCI stuff ****************************/
/* AMD HW pstate decoding **************************/
extern int decode_pstates(unsigned int cpu, unsigned int cpu_family,
int boost_states, unsigned long *pstates, int *no);
/* AMD HW pstate decoding **************************/
extern int cpufreq_has_boost_support(unsigned int cpu, int *support,
int *active, int * states);
/*
* CPUID functions returning a single datum
*/
unsigned int cpuid_eax(unsigned int op);
unsigned int cpuid_ebx(unsigned int op);
unsigned int cpuid_ecx(unsigned int op);
unsigned int cpuid_edx(unsigned int op);
/* cpuid and cpuinfo helpers **************************/
/* X86 ONLY ********************************************/
#else
static inline int decode_pstates(unsigned int cpu, unsigned int cpu_family,
int boost_states, unsigned long *pstates,
int *no)
{ return -1; };
static inline int read_msr(int cpu, unsigned int idx, unsigned long long *val)
{ return -1; };
static inline int write_msr(int cpu, unsigned int idx, unsigned long long val)
{ return -1; };
static inline int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
{ return -1; };
static inline int msr_intel_get_perf_bias(unsigned int cpu)
{ return -1; };
static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
{ return 0; };
/* Read/Write msr ****************************/
static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
int *active, int * states)
{ return -1; }
/* cpuid and cpuinfo helpers **************************/
static inline unsigned int cpuid_eax(unsigned int op) { return 0; };
static inline unsigned int cpuid_ebx(unsigned int op) { return 0; };
static inline unsigned int cpuid_ecx(unsigned int op) { return 0; };
static inline unsigned int cpuid_edx(unsigned int op) { return 0; };
#endif /* defined(__i386__) || defined(__x86_64__) */
#endif /* __CPUPOWERUTILS_HELPERS__ */
Reference in a new issue View git blame Copy permalink