linux/arch/s390/include/asm/topology.h

#ifndef _ASM_S390_TOPOLOGY_H
#define _ASM_S390_TOPOLOGY_H

#include <linux/cpumask.h>

#define mc_capable()	(1)

const struct cpumask *cpu_coregroup_mask(unsigned int cpu);

extern cpumask_t cpu_core_map[NR_CPUS];

#define topology_core_cpumask(cpu)	(&cpu_core_map[cpu])

int topology_set_cpu_management(int fc);
void topology_schedule_update(void);

#define POLARIZATION_UNKNWN	(-1)
#define POLARIZATION_HRZ	(0)
#define POLARIZATION_VL		(1)
#define POLARIZATION_VM		(2)
#define POLARIZATION_VH		(3)

#ifdef CONFIG_SMP
void s390_init_cpu_topology(void);
#else
static inline void s390_init_cpu_topology(void)
{
};
#endif

#define SD_MC_INIT SD_CPU_INIT

#include <asm-generic/topology.h>

#endif /* _ASM_S390_TOPOLOGY_H */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`#ifndef _ASM_S390_TOPOLOGY_H`
			`#define _ASM_S390_TOPOLOGY_H`

[S390] cpu topology support for s390. Add s390 backend so we can give the scheduler some hints about the cpu topology. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-17 05:46:12 +00:00			`#include <linux/cpumask.h>`

			`#define mc_capable() (1)`

cpumask: cpu_coregroup_mask(): s390 Like cpu_coregroup_map, but returns a (const) pointer. Compile-tested on s390 (defconfig). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> 2008-12-26 11:53:42 +00:00			`const struct cpumask *cpu_coregroup_mask(unsigned int cpu);`
[S390] cpu topology support for s390. Add s390 backend so we can give the scheduler some hints about the cpu topology. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-17 05:46:12 +00:00
[S390] Add topology_core_siblings to topology.h This exposes the core siblings to user space via sysfs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-30 11:38:40 +00:00			`extern cpumask_t cpu_core_map[NR_CPUS];`

cpumask: Introduce topology_core_cpumask()/topology_thread_cpumask(): s390 Impact: New API The old topology_core_siblings() and topology_thread_siblings() return a cpumask_t; these new ones return a (const) struct cpumask *. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> 2008-12-31 23:42:20 +00:00			`#define topology_core_cpumask(cpu) (&cpu_core_map[cpu])`
[S390] Add topology_core_siblings to topology.h This exposes the core siblings to user space via sysfs. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-30 11:38:40 +00:00
[S390] Vertical cpu management. If vertical cpu polarization is active then the hypervisor will dispatch certain cpus for a longer time than other cpus for maximum performance. For example if a guest would have three virtual cpus, each of them with a share of 33 percent, then in case of vertical cpu polarization all of the processing time would be combined to a single cpu which would run all the time, while the other two cpus would get nearly no cpu time. There are three different types of vertical cpus: high, medium and low. Low cpus hardly get any real cpu time, while high cpus get a full real cpu. Medium cpus get something in between. In order to switch between the two possible modes (default is horizontal) a 0 for horizontal polarization or a 1 for vertical polarization must be written to the dispatching sysfs attribute: /sys/devices/system/cpu/dispatching The polarization of each single cpu can be figured out by the polarization sysfs attribute of each cpu: /sys/devices/system/cpu/cpuX/polarization horizontal, vertical:high, vertical:medium, vertical:low or unknown. When switching polarization the polarization attribute may contain the value unknown until the configuration change is done and the kernel has figured out the new polarization of each cpu. Note that running a system with different types of vertical cpus may result in significant performance regressions. If possible only one type of vertical cpus should be used. All other cpus should be offlined. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-17 05:46:13 +00:00			`int topology_set_cpu_management(int fc);`
			`void topology_schedule_update(void);`

			`#define POLARIZATION_UNKNWN (-1)`
			`#define POLARIZATION_HRZ (0)`
			`#define POLARIZATION_VL (1)`
			`#define POLARIZATION_VM (2)`
			`#define POLARIZATION_VH (3)`

[S390] cpu topology support for s390. Add s390 backend so we can give the scheduler some hints about the cpu topology. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> 2008-04-17 05:46:12 +00:00			`#ifdef CONFIG_SMP`
			`void s390_init_cpu_topology(void);`
			`#else`
			`static inline void s390_init_cpu_topology(void)`
			`{`
			`};`
			`#endif`

[S390] topology: define SD_MC_INIT to fix performance regression The default values for SD_MC_INIT cause an additional cpu usage of up to 40% on some network benchmarks compared to the plain SD_CPU_INIT values. So just define SD_MC_INIT to SD_CPU_INIT. More tuning needs to be done. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2009-03-18 12:27:33 +00:00			`#define SD_MC_INIT SD_CPU_INIT`

Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 22:20:36 +00:00			`#include <asm-generic/topology.h>`

			`#endif /* _ASM_S390_TOPOLOGY_H */`