gh0s7/mckernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

implement mmap(MAP_POPULATE)

Browse Source 
populate_process_memory() function is not efficient,
because whether every small page is present is checked.
This commit is contained in:
NAKAMURA Gou
2014-01-24 21:27:18 +09:00
parent bdc945cb34
commit f0a52d4519
5 changed files with 93 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
kernel/process.c
View File

@ -1037,6 +1037,41 @@ static int do_page_fault_process(struct process *proc, void *fault_addr0, uint64
goto out;
}
}
else if (reason & PF_DONTCOW) {
pte_t *ptep;
void *ptepgaddr;
size_t ptepgsize;
int ptep2align;
ihk_mc_spinlock_lock_noirq(&vm->page_table_lock);
ptep = ihk_mc_pt_lookup_pte(vm->page_table, fault_addr0,
&ptepgaddr, &ptepgsize, &ptep2align);
ihk_mc_spinlock_unlock_noirq(&vm->page_table_lock);
if (!ptep || pte_is_null(ptep)) {
error = page_fault_process_memory_range(vm, range, fault_addr);
if (error == -ERESTART) {
goto out;
}
else if (error) {
kprintf("[%d]do_page_fault_process(%p,%lx,%lx):"
"fault range failed. %d\n",
ihk_mc_get_processor_id(), proc,
fault_addr0, reason, error);
goto out;
}
}
else if (!pte_is_writable(ptep) && (range->flag & VR_PROT_WRITE)) {
error = protection_fault_process_memory_range(vm, range, fault_addr);
if (error) {
kprintf("[%d]do_page_fault_process(%p,%lx,%lx):"
"protection range failed. %d\n",
ihk_mc_get_processor_id(), proc,
fault_addr0, reason, error);
goto out;
}
}
}
else {
error = page_fault_process_memory_range(vm, range, fault_addr);
if (error == -ERESTART) {
@ -1345,6 +1380,29 @@ void free_process_memory(struct process *proc)
free_process(vm->owner_process);
}
int populate_process_memory(struct process *proc, void *start, size_t len)
{
int error;
const int reason = PF_USER | PF_DONTCOW;
uintptr_t end;
uintptr_t addr;
end = (uintptr_t)start + len;
for (addr = (uintptr_t)start; addr < end; addr += PAGE_SIZE) {
error = page_fault_process(proc, (void *)addr, reason);
if (error) {
ekprintf("populate_process_range:page_fault_process"
"(%p,%lx,%lx) failed %d\n",
proc, addr, reason, error);
goto out;
}
}
error = 0;
out:
return error;
}
void hold_process(struct process *proc)
{
if (proc->status & (PS_ZOMBIE | PS_EXITED)) {