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tools/selftest/vm: allow choosing mem size and page size in map_hugetlb 

map_hugetlb maps 256Mbytes of memory with default hugepage size.

This patch allows the user to pass the size and page shift as an
argument in order to use different size and page size.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-02-08 15:02:55 +00:00 committed by Michael Ellerman
parent 6b9166f078
commit fa7b9a805c
1 changed files with 27 additions and 2 deletions
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29
tools/testing/selftests/vm/map_hugetlb.c
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@ -23,6 +23,14 @@
#define MAP_HUGETLB 0x40000 /* arch specific */
#endif
#ifndef MAP_HUGE_SHIFT
#define MAP_HUGE_SHIFT 26
#endif
#ifndef MAP_HUGE_MASK
#define MAP_HUGE_MASK 0x3f
#endif
/* Only ia64 requires this */
#ifdef __ia64__
#define ADDR (void *)(0x8000000000000000UL)
@ -58,12 +66,29 @@ static int read_bytes(char *addr)
return 0;
}
int main(void)
int main(int argc, char **argv)
{
void *addr;
int ret;
size_t length = LENGTH;
int flags = FLAGS;
int shift = 0;
addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, -1, 0);
if (argc > 1)
length = atol(argv[1]) << 20;
if (argc > 2) {
shift = atoi(argv[2]);
if (shift)
flags |= (shift & MAP_HUGE_MASK) << MAP_HUGE_SHIFT;
}
if (shift)
printf("%u kB hugepages\n", 1 << shift);
else
printf("Default size hugepages\n");
printf("Mapping %lu Mbytes\n", (unsigned long)length >> 20);
addr = mmap(ADDR, length, PROTECTION, flags, -1, 0);
if (addr == MAP_FAILED) {
perror("mmap");
exit(1);