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memory_range_lock: Enable interrupt when trylock fails

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Also use read-write-lock

Change-Id: I03150b7208325ec1fe422dcd5f931e4e41c8e40e
Refs: #452
This commit is contained in:
Tomoki Shirasawa
2019-07-29 14:12:50 +09:00
committed by Masamichi Takagi
parent 258156b57e
commit 0d3ef65092
13 changed files with 444 additions and 101 deletions
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42
kernel/include/process.h
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@@ -737,7 +737,7 @@ struct process_vm {
void *vvar_addr;
ihk_spinlock_t page_table_lock;
ihk_spinlock_t memory_range_lock;
struct ihk_rwlock memory_range_lock;
// to protect the followings:
// 1. addition of process "memory range" (extend_process_region, add_process_memory_range)
// 2. addition of process page table (allocate_pages, update_process_page_table)
@@ -771,6 +771,46 @@ static inline int has_cap_sys_admin(struct thread *th)
return !(th->proc->euid);
}
static inline void memory_range_read_lock(struct process_vm *vm,
unsigned long *flags)
{
for (;;) {
*flags = cpu_disable_interrupt_save();
if (ihk_mc_read_trylock(&vm->memory_range_lock)) {
break;
}
cpu_restore_interrupt(*flags);
cpu_pause();
}
}
static inline void memory_range_write_lock(struct process_vm *vm,
unsigned long *flags)
{
for (;;) {
*flags = cpu_disable_interrupt_save();
if (ihk_mc_write_trylock(&vm->memory_range_lock)) {
break;
}
cpu_restore_interrupt(*flags);
cpu_pause();
}
}
static inline void memory_range_read_unlock(struct process_vm *vm,
unsigned long *flags)
{
ihk_mc_read_unlock(&vm->memory_range_lock);
cpu_restore_interrupt(*flags);
}
static inline void memory_range_write_unlock(struct process_vm *vm,
unsigned long *flags)
{
ihk_mc_write_unlock(&vm->memory_range_lock);
cpu_restore_interrupt(*flags);
}
void hold_address_space(struct address_space *);
void release_address_space(struct address_space *);
struct thread *create_thread(unsigned long user_pc,