b4be7c9021
* simple_smp scheduler: Rewrote the interesting part of enqueue_in_run_queue(). It always selects a target CPU for the inserted thread, now. If no CPU is idle, the CPU running the thread with the lowest priority is chosen. If the thread running on the target CPU has a lower priority than the inserted one, it will be asked to reschedule. If that's the current CPU, we'll return the correct value (wasn't done before at all). These changes help reducing latencies. On my machine in an idle system playing music DebugAnalyzer shows maximum latencies of about 1 us. I still find that a bit much, but it's several orders of magnitude better than before. The -j8 Haiku image build time dropped about 10%. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34635 a95241bf-73f2-0310-859d-f6bbb57e9c96
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
|
|
* Copyright 2002-2006, Haiku Inc. All rights reserved.
|
|
* Distributed under the terms of the MIT License.
|
|
*
|
|
* Copyright 2002, Travis Geiselbrecht. All rights reserved.
|
|
* Distributed under the terms of the NewOS License.
|
|
*/
|
|
#ifndef _KERNEL_CPU_H
|
|
#define _KERNEL_CPU_H
|
|
|
|
|
|
#include <setjmp.h>
|
|
|
|
#include <smp.h>
|
|
#include <timer.h>
|
|
#include <boot/kernel_args.h>
|
|
#include <arch/cpu.h>
|
|
|
|
|
|
// define PAUSE, if not done in arch/cpu.h
|
|
#ifndef PAUSE
|
|
# define PAUSE()
|
|
#endif
|
|
|
|
|
|
struct thread;
|
|
|
|
|
|
/* CPU local data structure */
|
|
|
|
typedef struct cpu_ent {
|
|
int cpu_num;
|
|
|
|
// thread.c: used to force a reschedule at quantum expiration time
|
|
int preempted;
|
|
timer quantum_timer;
|
|
|
|
// keeping track of CPU activity
|
|
bigtime_t active_time;
|
|
bigtime_t last_kernel_time;
|
|
bigtime_t last_user_time;
|
|
|
|
// used in the kernel debugger
|
|
addr_t fault_handler;
|
|
addr_t fault_handler_stack_pointer;
|
|
jmp_buf fault_jump_buffer;
|
|
|
|
struct thread* running_thread;
|
|
bool invoke_scheduler;
|
|
bool invoke_scheduler_if_idle;
|
|
bool disabled;
|
|
|
|
// arch-specific stuff
|
|
arch_cpu_info arch;
|
|
} cpu_ent __attribute__((aligned(64)));
|
|
|
|
|
|
extern cpu_ent gCPU[MAX_BOOT_CPUS];
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
status_t cpu_preboot_init_percpu(struct kernel_args *args, int curr_cpu);
|
|
status_t cpu_init(struct kernel_args *args);
|
|
status_t cpu_init_percpu(kernel_args *ka, int curr_cpu);
|
|
status_t cpu_init_post_vm(struct kernel_args *args);
|
|
status_t cpu_init_post_modules(struct kernel_args *args);
|
|
bigtime_t cpu_get_active_time(int32 cpu);
|
|
|
|
cpu_ent *get_cpu_struct(void);
|
|
extern inline cpu_ent *get_cpu_struct(void) { return &gCPU[smp_get_current_cpu()]; }
|
|
|
|
void _user_clear_caches(void *address, size_t length, uint32 flags);
|
|
bool _user_cpu_enabled(int32 cpu);
|
|
status_t _user_set_cpu_enabled(int32 cpu, bool enabled);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _KERNEL_CPU_H */
|