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Message-ID: <CAJHvVcg+HcFwO4OJ-B0NanOJ+C9Wni1Gm4p-Jex_jPYyKzuP8Q@mail.gmail.com>
Date: Thu, 30 Mar 2023 12:14:00 -0700
From: Axel Rasmussen <axelrasmussen@...gle.com>
To: Peter Xu <peterx@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Leonardo Bras Soares Passos <lsoaresp@...hat.com>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH 04/29] selftests/mm: Merge util.h into vm_util.h
On Thu, Mar 30, 2023 at 9:07 AM Peter Xu <peterx@...hat.com> wrote:
>
> There're two util headers under mm/ kselftest. Merge one with another. It
> turns out util.h is the easy one to move.
>
> When merging, drop PAGE_SIZE / PAGE_SHIFT because they're unnecessary
> wrappers to page_size() / page_shift(), meanwhile rename them to psize()
> and pshift() so as to not conflict with some existing definitions in some
> test files that includes vm_util.h.
>
> Signed-off-by: Peter Xu <peterx@...hat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@...gle.com>
> ---
> tools/testing/selftests/mm/Makefile | 4 ++
> tools/testing/selftests/mm/gup_test.c | 5 +-
> tools/testing/selftests/mm/ksm_tests.c | 2 +-
> tools/testing/selftests/mm/mrelease_test.c | 11 ++-
> tools/testing/selftests/mm/transhuge-stress.c | 12 ++--
> tools/testing/selftests/mm/util.h | 69 -------------------
> tools/testing/selftests/mm/vm_util.c | 31 +++++++++
> tools/testing/selftests/mm/vm_util.h | 31 +++++++++
> 8 files changed, 80 insertions(+), 85 deletions(-)
> delete mode 100644 tools/testing/selftests/mm/util.h
>
> diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
> index fbf5646b1072..4188435967ed 100644
> --- a/tools/testing/selftests/mm/Makefile
> +++ b/tools/testing/selftests/mm/Makefile
> @@ -111,6 +111,10 @@ $(OUTPUT)/madv_populate: vm_util.c
> $(OUTPUT)/soft-dirty: vm_util.c
> $(OUTPUT)/split_huge_page_test: vm_util.c
> $(OUTPUT)/userfaultfd: vm_util.c
> +$(OUTPUT)/gup_test: vm_util.c
> +$(OUTPUT)/mrelease_test: vm_util.c
> +$(OUTPUT)/transhuge-stress: vm_util.c
> +$(OUTPUT)/ksm_tests: vm_util.c
>
> ifeq ($(MACHINE),x86_64)
> BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
> diff --git a/tools/testing/selftests/mm/gup_test.c b/tools/testing/selftests/mm/gup_test.c
> index e43879291dac..ec2229136384 100644
> --- a/tools/testing/selftests/mm/gup_test.c
> +++ b/tools/testing/selftests/mm/gup_test.c
> @@ -12,8 +12,7 @@
> #include <assert.h>
> #include <mm/gup_test.h>
> #include "../kselftest.h"
> -
> -#include "util.h"
> +#include "vm_util.h"
>
> #define MB (1UL << 20)
>
> @@ -251,7 +250,7 @@ int main(int argc, char **argv)
> if (touch) {
> gup.gup_flags |= FOLL_TOUCH;
> } else {
> - for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
> + for (; (unsigned long)p < gup.addr + size; p += psize())
> p[0] = 0;
> }
>
> diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
> index 9fb21b982dc9..85a49aea3ab8 100644
> --- a/tools/testing/selftests/mm/ksm_tests.c
> +++ b/tools/testing/selftests/mm/ksm_tests.c
> @@ -14,7 +14,7 @@
>
> #include "../kselftest.h"
> #include <include/vdso/time64.h>
> -#include "util.h"
> +#include "vm_util.h"
>
> #define KSM_SYSFS_PATH "/sys/kernel/mm/ksm/"
> #define KSM_FP(s) (KSM_SYSFS_PATH s)
> diff --git a/tools/testing/selftests/mm/mrelease_test.c b/tools/testing/selftests/mm/mrelease_test.c
> index 6c62966ab5db..37b6d33b9e84 100644
> --- a/tools/testing/selftests/mm/mrelease_test.c
> +++ b/tools/testing/selftests/mm/mrelease_test.c
> @@ -9,8 +9,7 @@
> #include <stdlib.h>
> #include <sys/wait.h>
> #include <unistd.h>
> -
> -#include "util.h"
> +#include "vm_util.h"
>
> #include "../kselftest.h"
>
> @@ -32,7 +31,7 @@ static int alloc_noexit(unsigned long nr_pages, int pipefd)
> unsigned long i;
> char *buf;
>
> - buf = (char *)mmap(NULL, nr_pages * PAGE_SIZE, PROT_READ | PROT_WRITE,
> + buf = (char *)mmap(NULL, nr_pages * psize(), PROT_READ | PROT_WRITE,
> MAP_PRIVATE | MAP_ANON, 0, 0);
> if (buf == MAP_FAILED) {
> perror("mmap failed, halting the test");
> @@ -40,7 +39,7 @@ static int alloc_noexit(unsigned long nr_pages, int pipefd)
> }
>
> for (i = 0; i < nr_pages; i++)
> - *((unsigned long *)(buf + (i * PAGE_SIZE))) = i;
> + *((unsigned long *)(buf + (i * psize()))) = i;
>
> /* Signal the parent that the child is ready */
> if (write(pipefd, "", 1) < 0) {
> @@ -54,7 +53,7 @@ static int alloc_noexit(unsigned long nr_pages, int pipefd)
> timeout--;
> }
>
> - munmap(buf, nr_pages * PAGE_SIZE);
> + munmap(buf, nr_pages * psize());
>
> return (timeout > 0) ? KSFT_PASS : KSFT_FAIL;
> }
> @@ -87,7 +86,7 @@ static int child_main(int pipefd[], size_t size)
>
> /* Allocate and fault-in memory and wait to be killed */
> close(pipefd[0]);
> - res = alloc_noexit(MB(size) / PAGE_SIZE, pipefd[1]);
> + res = alloc_noexit(MB(size) / psize(), pipefd[1]);
> close(pipefd[1]);
> return res;
> }
> diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c
> index e3f00adb1b82..ba9d37ad3a89 100644
> --- a/tools/testing/selftests/mm/transhuge-stress.c
> +++ b/tools/testing/selftests/mm/transhuge-stress.c
> @@ -15,7 +15,7 @@
> #include <fcntl.h>
> #include <string.h>
> #include <sys/mman.h>
> -#include "util.h"
> +#include "vm_util.h"
>
> int backing_fd = -1;
> int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
> @@ -34,10 +34,10 @@ int main(int argc, char **argv)
> int pagemap_fd;
>
> ram = sysconf(_SC_PHYS_PAGES);
> - if (ram > SIZE_MAX / sysconf(_SC_PAGESIZE) / 4)
> + if (ram > SIZE_MAX / psize() / 4)
> ram = SIZE_MAX / 4;
> else
> - ram *= sysconf(_SC_PAGESIZE);
> + ram *= psize();
> len = ram;
>
> while (++i < argc) {
> @@ -58,7 +58,7 @@ int main(int argc, char **argv)
>
> warnx("allocate %zd transhuge pages, using %zd MiB virtual memory"
> " and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20,
> - ram >> (20 + HPAGE_SHIFT - PAGE_SHIFT - 1));
> + ram >> (20 + HPAGE_SHIFT - pshift() - 1));
>
> pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
> if (pagemap_fd < 0)
> @@ -92,7 +92,7 @@ int main(int argc, char **argv)
> if (pfn < 0) {
> nr_failed++;
> } else {
> - size_t idx = pfn >> (HPAGE_SHIFT - PAGE_SHIFT);
> + size_t idx = pfn >> (HPAGE_SHIFT - pshift());
>
> nr_succeed++;
> if (idx >= map_len) {
> @@ -108,7 +108,7 @@ int main(int argc, char **argv)
> }
>
> /* split transhuge page, keep last page */
> - if (madvise(p, HPAGE_SIZE - PAGE_SIZE, MADV_DONTNEED))
> + if (madvise(p, HPAGE_SIZE - psize(), MADV_DONTNEED))
> err(2, "MADV_DONTNEED");
> }
> clock_gettime(CLOCK_MONOTONIC, &b);
> diff --git a/tools/testing/selftests/mm/util.h b/tools/testing/selftests/mm/util.h
> deleted file mode 100644
> index b27d26199334..000000000000
> --- a/tools/testing/selftests/mm/util.h
> +++ /dev/null
> @@ -1,69 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -
> -#ifndef __KSELFTEST_VM_UTIL_H
> -#define __KSELFTEST_VM_UTIL_H
> -
> -#include <stdint.h>
> -#include <sys/mman.h>
> -#include <err.h>
> -#include <string.h> /* ffsl() */
> -#include <unistd.h> /* _SC_PAGESIZE */
> -
> -static unsigned int __page_size;
> -static unsigned int __page_shift;
> -
> -static inline unsigned int page_size(void)
> -{
> - if (!__page_size)
> - __page_size = sysconf(_SC_PAGESIZE);
> - return __page_size;
> -}
> -
> -static inline unsigned int page_shift(void)
> -{
> - if (!__page_shift)
> - __page_shift = (ffsl(page_size()) - 1);
> - return __page_shift;
> -}
> -
> -#define PAGE_SHIFT (page_shift())
> -#define PAGE_SIZE (page_size())
> -/*
> - * On ppc64 this will only work with radix 2M hugepage size
> - */
> -#define HPAGE_SHIFT 21
> -#define HPAGE_SIZE (1 << HPAGE_SHIFT)
> -
> -#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
> -#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
> -
> -
> -static inline int64_t allocate_transhuge(void *ptr, int pagemap_fd)
> -{
> - uint64_t ent[2];
> -
> - /* drop pmd */
> - if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE,
> - MAP_FIXED | MAP_ANONYMOUS |
> - MAP_NORESERVE | MAP_PRIVATE, -1, 0) != ptr)
> - errx(2, "mmap transhuge");
> -
> - if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE))
> - err(2, "MADV_HUGEPAGE");
> -
> - /* allocate transparent huge page */
> - *(volatile void **)ptr = ptr;
> -
> - if (pread(pagemap_fd, ent, sizeof(ent),
> - (uintptr_t)ptr >> (PAGE_SHIFT - 3)) != sizeof(ent))
> - err(2, "read pagemap");
> -
> - if (PAGEMAP_PRESENT(ent[0]) && PAGEMAP_PRESENT(ent[1]) &&
> - PAGEMAP_PFN(ent[0]) + 1 == PAGEMAP_PFN(ent[1]) &&
> - !(PAGEMAP_PFN(ent[0]) & ((1 << (HPAGE_SHIFT - PAGE_SHIFT)) - 1)))
> - return PAGEMAP_PFN(ent[0]);
> -
> - return -1;
> -}
> -
> -#endif
> diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c
> index 40e795624ff3..0204c469be43 100644
> --- a/tools/testing/selftests/mm/vm_util.c
> +++ b/tools/testing/selftests/mm/vm_util.c
> @@ -8,6 +8,9 @@
> #define SMAP_FILE_PATH "/proc/self/smaps"
> #define MAX_LINE_LENGTH 500
>
> +unsigned int __page_size;
> +unsigned int __page_shift;
> +
> uint64_t pagemap_get_entry(int fd, char *start)
> {
> const unsigned long pfn = (unsigned long)start / getpagesize();
> @@ -149,3 +152,31 @@ bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size)
> {
> return __check_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size);
> }
> +
> +int64_t allocate_transhuge(void *ptr, int pagemap_fd)
> +{
> + uint64_t ent[2];
> +
> + /* drop pmd */
> + if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE,
> + MAP_FIXED | MAP_ANONYMOUS |
> + MAP_NORESERVE | MAP_PRIVATE, -1, 0) != ptr)
> + errx(2, "mmap transhuge");
> +
> + if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE))
> + err(2, "MADV_HUGEPAGE");
> +
> + /* allocate transparent huge page */
> + *(volatile void **)ptr = ptr;
> +
> + if (pread(pagemap_fd, ent, sizeof(ent),
> + (uintptr_t)ptr >> (pshift() - 3)) != sizeof(ent))
> + err(2, "read pagemap");
> +
> + if (PAGEMAP_PRESENT(ent[0]) && PAGEMAP_PRESENT(ent[1]) &&
> + PAGEMAP_PFN(ent[0]) + 1 == PAGEMAP_PFN(ent[1]) &&
> + !(PAGEMAP_PFN(ent[0]) & ((1 << (HPAGE_SHIFT - pshift())) - 1)))
> + return PAGEMAP_PFN(ent[0]);
> +
> + return -1;
> +}
> diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
> index 1995ee911ef2..6edeb531afc6 100644
> --- a/tools/testing/selftests/mm/vm_util.h
> +++ b/tools/testing/selftests/mm/vm_util.h
> @@ -1,6 +1,27 @@
> /* SPDX-License-Identifier: GPL-2.0 */
> #include <stdint.h>
> #include <stdbool.h>
> +#include <sys/mman.h>
> +#include <err.h>
> +#include <string.h> /* ffsl() */
> +#include <unistd.h> /* _SC_PAGESIZE */
> +
> +extern unsigned int __page_size;
> +extern unsigned int __page_shift;
> +
> +static inline unsigned int psize(void)
> +{
> + if (!__page_size)
> + __page_size = sysconf(_SC_PAGESIZE);
> + return __page_size;
> +}
> +
> +static inline unsigned int pshift(void)
> +{
> + if (!__page_shift)
> + __page_shift = (ffsl(psize()) - 1);
> + return __page_shift;
> +}
>
> uint64_t pagemap_get_entry(int fd, char *start);
> bool pagemap_is_softdirty(int fd, char *start);
> @@ -13,3 +34,13 @@ uint64_t read_pmd_pagesize(void);
> bool check_huge_anon(void *addr, int nr_hpages, uint64_t hpage_size);
> bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size);
> bool check_huge_shmem(void *addr, int nr_hpages, uint64_t hpage_size);
> +int64_t allocate_transhuge(void *ptr, int pagemap_fd);
> +
> +/*
> + * On ppc64 this will only work with radix 2M hugepage size
> + */
> +#define HPAGE_SHIFT 21
> +#define HPAGE_SIZE (1 << HPAGE_SHIFT)
> +
> +#define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0)
> +#define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1))
> --
> 2.39.1
>
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