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selftests: KVM: skip hugetlb tests if huge pages are not available

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Right now, if KVM memory stress tests are run with hugetlb sources but hugetlb is
not available (either in the kernel or because /proc/sys/vm/nr_hugepages is 0)
the test will fail with a memory allocation error.

This makes it impossible to add tests that default to hugetlb-backed memory,
because on a machine with a default configuration they will fail.  Therefore,
check HugePages_Total as well and, if zero, direct the user to enable hugepages
in procfs.  Furthermore, return KSFT_SKIP whenever hugetlb is not available.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-14 08:35:16 -04:00
parent 53293cb81b
commit 3dc40cf89b
1 changed files with 16 additions and 9 deletions
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25
tools/testing/selftests/kvm/lib/test_util.c
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@ -165,26 +165,33 @@ size_t get_trans_hugepagesz(void)
size_t get_def_hugetlb_pagesz(void)
{
char buf[64];
const char *tag = "Hugepagesize:";
const char *hugepagesize = "Hugepagesize:";
const char *hugepages_total = "HugePages_Total:";
FILE *f;
f = fopen("/proc/meminfo", "r");
TEST_ASSERT(f != NULL, "Error in opening /proc/meminfo");
while (fgets(buf, sizeof(buf), f) != NULL) {
if (strstr(buf, tag) == buf) {
if (strstr(buf, hugepages_total) == buf) {
unsigned long long total = strtoull(buf + strlen(hugepages_total), NULL, 10);
if (!total) {
fprintf(stderr, "HUGETLB is not enabled in /proc/sys/vm/nr_hugepages\n");
exit(KSFT_SKIP);
}
}
if (strstr(buf, hugepagesize) == buf) {
fclose(f);
return strtoull(buf + strlen(tag), NULL, 10) << 10;
return strtoull(buf + strlen(hugepagesize), NULL, 10) << 10;
}
}
if (feof(f))
TEST_FAIL("HUGETLB is not configured in host kernel");
else
TEST_FAIL("Error in reading /proc/meminfo");
if (feof(f)) {
fprintf(stderr, "HUGETLB is not configured in host kernel");
exit(KSFT_SKIP);
}
fclose(f);
return 0;
TEST_FAIL("Error in reading /proc/meminfo");
}
#define ANON_FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)