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faster task switch 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@270 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-06-25 00:08:13 +00:00
parent f1510b2cc3
commit 7c2d6a781c
1 changed files with 14 additions and 4 deletions
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18
exec.c
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@ -585,22 +585,32 @@ void page_unmap(void)
{
PageDesc *p, *pmap;
unsigned long addr;
int i, j, ret;
int i, j, ret, j1;
for(i = 0; i < L1_SIZE; i++) {
pmap = l1_map[i];
if (pmap) {
p = pmap;
for(j = 0;j < L2_SIZE; j++) {
for(j = 0;j < L2_SIZE;) {
if (p->flags & PAGE_VALID) {
addr = (i << (32 - L1_BITS)) | (j << TARGET_PAGE_BITS);
ret = munmap((void *)addr, TARGET_PAGE_SIZE);
/* we try to find a range to make less syscalls */
j1 = j;
p++;
j++;
while (j < L2_SIZE && (p->flags & PAGE_VALID)) {
p++;
j++;
}
ret = munmap((void *)addr, (j - j1) << TARGET_PAGE_BITS);
if (ret != 0) {
fprintf(stderr, "Could not unmap page 0x%08lx\n", addr);
exit(1);
}
} else {
p++;
j++;
}
p++;
}
free(pmap);
l1_map[i] = NULL;