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Thu, 29 Oct 2020 19:34:12 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" Subject: [PATCH 19/19] selftests/vm/transhuge-stress: Support file-backed THPs Date: Thu, 29 Oct 2020 19:34:05 +0000 Message-Id: <20201029193405.29125-20-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201029193405.29125-1-willy@infradead.org> References: <20201029193405.29125-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a -f option to test THPs on files Signed-off-by: Matthew Wilcox (Oracle) --- tools/testing/selftests/vm/transhuge-stress.c | 36 ++++++++++++------- 1 file changed, 24 insertions(+), 12 deletions(-) diff --git a/tools/testing/selftests/vm/transhuge-stress.c b/tools/testin= g/selftests/vm/transhuge-stress.c index fd7f1b4a96f9..77b775700bf6 100644 --- a/tools/testing/selftests/vm/transhuge-stress.c +++ b/tools/testing/selftests/vm/transhuge-stress.c @@ -26,15 +26,17 @@ #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1)) =20 int pagemap_fd; +int backing_fd =3D -1; +int mmap_flags =3D MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE; +#define PROT_RW (PROT_READ | PROT_WRITE) =20 int64_t allocate_transhuge(void *ptr) { uint64_t ent[2]; =20 /* drop pmd */ - if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE, - MAP_FIXED | MAP_ANONYMOUS | - MAP_NORESERVE | MAP_PRIVATE, -1, 0) !=3D ptr) + if (mmap(ptr, HPAGE_SIZE, PROT_RW, MAP_FIXED | mmap_flags, + backing_fd, 0) !=3D ptr) errx(2, "mmap transhuge"); =20 if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE)) @@ -60,6 +62,8 @@ int main(int argc, char **argv) size_t ram, len; void *ptr, *p; struct timespec a, b; + int i =3D 0; + char *name =3D NULL; double s; uint8_t *map; size_t map_len; @@ -69,14 +73,23 @@ int main(int argc, char **argv) ram =3D SIZE_MAX / 4; else ram *=3D sysconf(_SC_PAGESIZE); + len =3D ram; + + while (++i < argc) { + if (!strcmp(argv[i], "-h")) + errx(1, "usage: %s [size in MiB]", argv[0]); + else if (!strcmp(argv[i], "-f")) + name =3D argv[++i]; + else + len =3D atoll(argv[i]) << 20; + } =20 - if (argc =3D=3D 1) - len =3D ram; - else if (!strcmp(argv[1], "-h")) - errx(1, "usage: %s [size in MiB]", argv[0]); - else - len =3D atoll(argv[1]) << 20; - + if (name) { + backing_fd =3D open(name, O_RDWR); + if (backing_fd =3D=3D -1) + err(2, "open %s", name); + mmap_flags =3D MAP_SHARED; + } warnx("allocate %zd transhuge pages, using %zd MiB virtual memory" " and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20, len >> (20 + HPAGE_SHIFT - PAGE_SHIFT - 1)); @@ -86,8 +99,7 @@ int main(int argc, char **argv) err(2, "open pagemap"); =20 len -=3D len % HPAGE_SIZE; - ptr =3D mmap(NULL, len + HPAGE_SIZE, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0); + ptr =3D mmap(NULL, len + HPAGE_SIZE, PROT_RW, mmap_flags, backing_fd, 0= ); if (ptr =3D=3D MAP_FAILED) err(2, "initial mmap"); ptr +=3D HPAGE_SIZE - (uintptr_t)ptr % HPAGE_SIZE; --=20 2.28.0