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selftests/mm/cow: add tests for anonymous multi-size THP 

Add tests similar to the existing PMD-sized THP tests, but which operate
on memory backed by (PTE-mapped) multi-size THP.  This reuses all the
existing infrastructure.  If the test suite detects that multi-size THP is
not supported by the kernel, the new tests are skipped.

Link: https://lkml.kernel.org/r/20231207161211.2374093-11-ryan.roberts@arm.com
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Barry Song <v-songbaohua@oppo.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Itaru Kitayama <itaru.kitayama@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryan Roberts 2023-12-07 16:12:11 +00:00 committed by Andrew Morton
parent 12dc16b384
commit c0f7910332
1 changed files with 70 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
tools/testing/selftests/mm/cow.c
View File

@ -29,15 +29,49 @@
#include "../../../../mm/gup_test.h"
#include "../kselftest.h"
#include "vm_util.h"
#include "thp_settings.h"
static size_t pagesize;
static int pagemap_fd;
static size_t pmdsize;
static int nr_thpsizes;
static size_t thpsizes[20];
static int nr_hugetlbsizes;
static size_t hugetlbsizes[10];
static int gup_fd;
static bool has_huge_zeropage;
static int sz2ord(size_t size)
{
return __builtin_ctzll(size / pagesize);
}
static int detect_thp_sizes(size_t sizes[], int max)
{
int count = 0;
unsigned long orders;
size_t kb;
int i;
/* thp not supported at all. */
if (!pmdsize)
return 0;
orders = 1UL << sz2ord(pmdsize);
orders |= thp_supported_orders();
for (i = 0; orders && count < max; i++) {
if (!(orders & (1UL << i)))
continue;
orders &= ~(1UL << i);
kb = (pagesize >> 10) << i;
sizes[count++] = kb * 1024;
ksft_print_msg("[INFO] detected THP size: %zu KiB\n", kb);
}
return count;
}
static void detect_huge_zeropage(void)
{
int fd = open("/sys/kernel/mm/transparent_hugepage/use_zero_page",
@ -1101,15 +1135,27 @@ static void run_anon_test_case(struct test_case const *test_case)
run_with_base_page(test_case->fn, test_case->desc);
run_with_base_page_swap(test_case->fn, test_case->desc);
if (pmdsize) {
run_with_thp(test_case->fn, test_case->desc, pmdsize);
run_with_thp_swap(test_case->fn, test_case->desc, pmdsize);
run_with_pte_mapped_thp(test_case->fn, test_case->desc, pmdsize);
run_with_pte_mapped_thp_swap(test_case->fn, test_case->desc, pmdsize);
run_with_single_pte_of_thp(test_case->fn, test_case->desc, pmdsize);
run_with_single_pte_of_thp_swap(test_case->fn, test_case->desc, pmdsize);
run_with_partial_mremap_thp(test_case->fn, test_case->desc, pmdsize);
run_with_partial_shared_thp(test_case->fn, test_case->desc, pmdsize);
for (i = 0; i < nr_thpsizes; i++) {
size_t size = thpsizes[i];
struct thp_settings settings = *thp_current_settings();
settings.hugepages[sz2ord(pmdsize)].enabled = THP_NEVER;
settings.hugepages[sz2ord(size)].enabled = THP_ALWAYS;
thp_push_settings(&settings);
if (size == pmdsize) {
run_with_thp(test_case->fn, test_case->desc, size);
run_with_thp_swap(test_case->fn, test_case->desc, size);
}
run_with_pte_mapped_thp(test_case->fn, test_case->desc, size);
run_with_pte_mapped_thp_swap(test_case->fn, test_case->desc, size);
run_with_single_pte_of_thp(test_case->fn, test_case->desc, size);
run_with_single_pte_of_thp_swap(test_case->fn, test_case->desc, size);
run_with_partial_mremap_thp(test_case->fn, test_case->desc, size);
run_with_partial_shared_thp(test_case->fn, test_case->desc, size);
thp_pop_settings();
}
for (i = 0; i < nr_hugetlbsizes; i++)
run_with_hugetlb(test_case->fn, test_case->desc,
@ -1130,8 +1176,9 @@ static int tests_per_anon_test_case(void)
{
int tests = 2 + nr_hugetlbsizes;
tests += 6 * nr_thpsizes;
if (pmdsize)
tests += 8;
tests += 2;
return tests;
}
@ -1689,16 +1736,22 @@ static int tests_per_non_anon_test_case(void)
int main(int argc, char **argv)
{
int err;
struct thp_settings default_settings;
ksft_print_header();
pagesize = getpagesize();
pmdsize = read_pmd_pagesize();
if (pmdsize) {
/* Only if THP is supported. */
thp_read_settings(&default_settings);
default_settings.hugepages[sz2ord(pmdsize)].enabled = THP_INHERIT;
thp_save_settings();
thp_push_settings(&default_settings);
ksft_print_msg("[INFO] detected PMD size: %zu KiB\n",
pmdsize / 1024);
ksft_print_msg("[INFO] detected THP size: %zu KiB\n",
pmdsize / 1024);
nr_thpsizes = detect_thp_sizes(thpsizes, ARRAY_SIZE(thpsizes));
}
nr_hugetlbsizes = detect_hugetlb_page_sizes(hugetlbsizes,
ARRAY_SIZE(hugetlbsizes));
@ -1717,6 +1770,11 @@ int main(int argc, char **argv)
run_anon_thp_test_cases();
run_non_anon_test_cases();
if (pmdsize) {
/* Only if THP is supported. */
thp_restore_settings();
}
err = ksft_get_fail_cnt();
if (err)
ksft_exit_fail_msg("%d out of %d tests failed\n",