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420f8f68c9
With a NR_CPUS==128 kernel with CPU hotplug enabled we would waste 4MB on per CPU data of all possible CPUs. The reason was that HOTPLUG always set up possible map to NR_CPUS cpus and then we need to allocate that much (each per CPU data is roughly ~32k now) The underlying problem is that ACPI didn't tell us how many hotplug CPUs the platform supports. So the old code just assumed all, which would lead to this memory wastage. This implements some new heuristics: - If the BIOS specified disabled CPUs in the ACPI/mptables assume they can be enabled later (this is bending the ACPI specification a bit, but seems like a obvious extension) - The user can overwrite it with a new additionals_cpus=NUM option - Otherwise use half of the available CPUs or 2, whatever is more. Cc: ashok.raj@intel.com Cc: len.brown@intel.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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/*
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* We need the APIC definitions automatically as part of 'smp.h'
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*/
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#ifndef __ASSEMBLY__
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#include <linux/config.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/bitops.h>
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extern int disable_apic;
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#endif
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#ifdef CONFIG_X86_LOCAL_APIC
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#ifndef __ASSEMBLY__
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#ifdef CONFIG_X86_IO_APIC
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#include <asm/io_apic.h>
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#endif
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#include <asm/apic.h>
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#include <asm/thread_info.h>
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#endif
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#endif
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#ifdef CONFIG_SMP
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#ifndef ASSEMBLY
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#include <asm/pda.h>
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struct pt_regs;
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extern cpumask_t cpu_present_mask;
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extern cpumask_t cpu_possible_map;
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extern cpumask_t cpu_online_map;
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extern cpumask_t cpu_callout_map;
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/*
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* Private routines/data
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*/
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extern void smp_alloc_memory(void);
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extern volatile unsigned long smp_invalidate_needed;
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extern int pic_mode;
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extern void lock_ipi_call_lock(void);
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extern void unlock_ipi_call_lock(void);
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extern int smp_num_siblings;
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extern void smp_send_reschedule(int cpu);
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void smp_stop_cpu(void);
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extern int smp_call_function_single(int cpuid, void (*func) (void *info),
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void *info, int retry, int wait);
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extern cpumask_t cpu_sibling_map[NR_CPUS];
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extern cpumask_t cpu_core_map[NR_CPUS];
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extern u8 phys_proc_id[NR_CPUS];
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extern u8 cpu_core_id[NR_CPUS];
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#define SMP_TRAMPOLINE_BASE 0x6000
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/*
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* On x86 all CPUs are mapped 1:1 to the APIC space.
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* This simplifies scheduling and IPI sending and
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* compresses data structures.
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*/
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static inline int num_booting_cpus(void)
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{
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return cpus_weight(cpu_callout_map);
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}
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#define raw_smp_processor_id() read_pda(cpunumber)
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static inline int hard_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_ID(*(unsigned int *)(APIC_BASE+APIC_ID));
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}
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extern int safe_smp_processor_id(void);
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extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void prefill_possible_map(void);
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extern unsigned num_processors;
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extern unsigned disabled_cpus;
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#endif /* !ASSEMBLY */
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#define NO_PROC_ID 0xFF /* No processor magic marker */
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#endif
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#ifndef ASSEMBLY
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/*
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* Some lowlevel functions might want to know about
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* the real APIC ID <-> CPU # mapping.
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*/
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extern u8 x86_cpu_to_apicid[NR_CPUS]; /* physical ID */
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extern u8 x86_cpu_to_log_apicid[NR_CPUS];
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extern u8 bios_cpu_apicid[];
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static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
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{
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return cpus_addr(cpumask)[0];
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}
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static inline int cpu_present_to_apicid(int mps_cpu)
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{
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if (mps_cpu < NR_CPUS)
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return (int)bios_cpu_apicid[mps_cpu];
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else
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return BAD_APICID;
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}
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#endif /* !ASSEMBLY */
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#ifndef CONFIG_SMP
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#define stack_smp_processor_id() 0
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#define safe_smp_processor_id() 0
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#define cpu_logical_map(x) (x)
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#else
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#include <asm/thread_info.h>
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#define stack_smp_processor_id() \
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({ \
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struct thread_info *ti; \
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__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
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ti->cpu; \
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})
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#endif
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#ifndef __ASSEMBLY__
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static __inline int logical_smp_processor_id(void)
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{
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/* we don't want to mark this access volatile - bad code generation */
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return GET_APIC_LOGICAL_ID(*(unsigned long *)(APIC_BASE+APIC_LDR));
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}
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#endif
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#endif
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