9ba40dc0ff
releasing the runq lock after loading page tables but before the actual context switch can leave execution in an inconsistent if the current process is descheduled from an IRQ between these two steps. this patch holds the runq lock with IRQs disabled and makes the context switch a single atomic operation.
86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/**
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* \file cls.h
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* License details are found in the file LICENSE.
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* \brief
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* Structure of cpu local variable
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* \author Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp> \par
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* Copyright (C) 2011 - 2012 Taku Shimosawa
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*/
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/*
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* HISTORY:
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*/
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#ifndef __HEADER_CLS_H
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#define __HEADER_CLS_H
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#include <process.h>
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#include <syscall.h>
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/*
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* CPU Local Storage (cls)
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*/
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struct malloc_header {
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unsigned int check;
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unsigned int cpu_id;
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struct malloc_header *next;
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unsigned long size;
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};
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#include <ihk/lock.h>
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#define CPU_STATUS_DISABLE (0)
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#define CPU_STATUS_IDLE (1)
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#define CPU_STATUS_RUNNING (2)
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#define CPU_STATUS_RESERVED (3)
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extern ihk_spinlock_t cpu_status_lock;
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#define CPU_FLAG_NEED_RESCHED 0x1U
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#define CPU_FLAG_NEED_MIGRATE 0x2U
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struct cpu_local_var {
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/* malloc */
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struct malloc_header free_list;
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ihk_spinlock_t free_list_lock;
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struct process idle;
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struct fork_tree_node idle_ftn;
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struct process_vm idle_vm;
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ihk_spinlock_t runq_lock;
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unsigned long runq_irqstate;
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struct process *current;
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struct list_head runq;
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size_t runq_len;
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struct ihk_ikc_channel_desc *syscall_channel;
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struct syscall_params scp;
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struct ikc_scd_init_param iip;
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struct ihk_ikc_channel_desc *syscall_channel2;
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struct syscall_params scp2;
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struct ikc_scd_init_param iip2;
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int status;
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int fs;
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struct list_head pending_free_pages;
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unsigned int flags;
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ihk_spinlock_t migq_lock;
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struct list_head migq;
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int in_interrupt;
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int no_preempt;
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int timer_enabled;
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} __attribute__((aligned(64)));
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struct cpu_local_var *get_cpu_local_var(int id);
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static struct cpu_local_var *get_this_cpu_local_var(void)
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{
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return get_cpu_local_var(ihk_mc_get_processor_id());
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}
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#define cpu_local_var(name) get_this_cpu_local_var()->name
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#endif
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