Patch series "selftests/vm: gup_test, hmm-tests, assorted improvements", v3.
Summary: This series provides two main things, and a number of smaller
supporting goodies. The two main points are:
1) Add a new sub-test to gup_test, which in turn is a renamed version
of gup_benchmark. This sub-test allows nicer testing of dump_pages(),
at least on user-space pages.
For quite a while, I was doing a quick hack to gup_test.c whenever I
wanted to try out changes to dump_page(). Then Matthew Wilcox asked me
what I meant when I said "I used my dump_page() unit test", and I
realized that it might be nice to check in a polished up version of
that.
Details about how it works and how to use it are in the commit
description for patch #6 ("selftests/vm: gup_test: introduce the
dump_pages() sub-test").
2) Fixes a limitation of hmm-tests: these tests are incredibly useful,
but only if people actually build and run them. And it turns out that
libhugetlbfs is a little too effective at throwing a wrench in the
works, there. So I've added a little configuration check that removes
just two of the 21 hmm-tests, if libhugetlbfs is not available.
Further details in the commit description of patch #8
("selftests/vm: hmm-tests: remove the libhugetlbfs dependency").
Other smaller things that this series does:
a) Remove code duplication by creating gup_test.h.
b) Clear up the sub-test organization, and their invocation within
run_vmtests.sh.
c) Other minor assorted improvements.
[1] v2 is here:
https://lore.kernel.org/linux-doc/
20200929212747.251804-1-jhubbard@nvidia.com/
[2] https://lore.kernel.org/r/CAHk-=wgh-TMPHLY3jueHX7Y2fWh3D+nMBqVS__AZm6-oorquWA@mail.gmail.com
This patch (of 9):
Rename nearly every "gup_benchmark" reference and file name to "gup_test".
The one exception is for the actual gup benchmark test itself.
The current code already does a *little* bit more than benchmarking, and
definitely covers more than get_user_pages_fast(). More importantly,
however, subsequent patches are about to add some functionality that is
non-benchmark related.
Closely related changes:
* Kconfig: in addition to renaming the options from GUP_BENCHMARK to
GUP_TEST, update the help text to reflect that it's no longer a
benchmark-only test.
Link: https://lkml.kernel.org/r/20201026064021.3545418-1-jhubbard@nvidia.com
Link: https://lkml.kernel.org/r/20201026064021.3545418-2-jhubbard@nvidia.com
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
============
This file::
- tools/testing/selftests/vm/gup_benchmark.c
+ tools/testing/selftests/vm/gup_test.c
has the following new calls to exercise the new pin*() wrapper functions:
-* PIN_FAST_BENCHMARK (./gup_benchmark -a)
-* PIN_BENCHMARK (./gup_benchmark -b)
+* PIN_FAST_BENCHMARK (./gup_test -a)
+* PIN_BENCHMARK (./gup_test -b)
You can monitor how many total dma-pinned pages have been acquired and released
since the system was booted, via two new /proc/vmstat entries: ::
CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
CONFIG_IDLE_PAGE_TRACKING=y
CONFIG_PERCPU_STATS=y
-CONFIG_GUP_BENCHMARK=y
+CONFIG_GUP_TEST=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_DIAG=m
CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
CONFIG_IDLE_PAGE_TRACKING=y
CONFIG_PERCPU_STATS=y
-CONFIG_GUP_BENCHMARK=y
+CONFIG_GUP_TEST=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_DIAG=m
information includes global and per chunk statistics, which can
be used to help understand percpu memory usage.
-config GUP_BENCHMARK
- bool "Enable infrastructure for get_user_pages() and related calls benchmarking"
+config GUP_TEST
+ bool "Enable infrastructure for get_user_pages()-related unit tests"
help
- Provides /sys/kernel/debug/gup_benchmark that helps with testing
- performance of get_user_pages() and related calls.
+ Provides /sys/kernel/debug/gup_test, which in turn provides a way
+ to make ioctl calls that can launch kernel-based unit tests for
+ the get_user_pages*() and pin_user_pages*() family of API calls.
- See tools/testing/selftests/vm/gup_benchmark.c
+ These tests include benchmark testing of the _fast variants of
+ get_user_pages*() and pin_user_pages*(), as well as smoke tests of
+ the non-_fast variants.
+
+ See tools/testing/selftests/vm/gup_test.c
config GUP_GET_PTE_LOW_HIGH
bool
obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o
obj-$(CONFIG_MEMCG_SWAP) += swap_cgroup.o
obj-$(CONFIG_CGROUP_HUGETLB) += hugetlb_cgroup.o
-obj-$(CONFIG_GUP_BENCHMARK) += gup_benchmark.o
+obj-$(CONFIG_GUP_TEST) += gup_test.o
obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o
obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
#include <linux/ktime.h>
#include <linux/debugfs.h>
-#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark)
-#define GUP_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
-#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
-#define PIN_BENCHMARK _IOWR('g', 4, struct gup_benchmark)
-#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark)
+#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
+#define GUP_BENCHMARK _IOWR('g', 2, struct gup_test)
+#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_test)
+#define PIN_BENCHMARK _IOWR('g', 4, struct gup_test)
+#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_test)
-struct gup_benchmark {
+struct gup_test {
__u64 get_delta_usec;
__u64 put_delta_usec;
__u64 addr;
if (WARN(!page_maybe_dma_pinned(page),
"pages[%lu] is NOT dma-pinned\n", i)) {
- dump_page(page, "gup_benchmark failure");
+ dump_page(page, "gup_test failure");
break;
}
}
}
}
-static int __gup_benchmark_ioctl(unsigned int cmd,
- struct gup_benchmark *gup)
+static int __gup_test_ioctl(unsigned int cmd,
+ struct gup_test *gup)
{
ktime_t start_time, end_time;
unsigned long i, nr_pages, addr, next;
return ret;
}
-static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
+static long gup_test_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
- struct gup_benchmark gup;
+ struct gup_test gup;
int ret;
switch (cmd) {
if (copy_from_user(&gup, (void __user *)arg, sizeof(gup)))
return -EFAULT;
- ret = __gup_benchmark_ioctl(cmd, &gup);
+ ret = __gup_test_ioctl(cmd, &gup);
if (ret)
return ret;
return 0;
}
-static const struct file_operations gup_benchmark_fops = {
+static const struct file_operations gup_test_fops = {
.open = nonseekable_open,
- .unlocked_ioctl = gup_benchmark_ioctl,
+ .unlocked_ioctl = gup_test_ioctl,
};
-static int gup_benchmark_init(void)
+static int gup_test_init(void)
{
- debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL,
- &gup_benchmark_fops);
+ debugfs_create_file_unsafe("gup_test", 0600, NULL, NULL,
+ &gup_test_fops);
return 0;
}
-late_initcall(gup_benchmark_init);
+late_initcall(gup_test_init);
mlock-intersect-test
mlock-random-test
virtual_address_range
-gup_benchmark
+gup_test
va_128TBswitch
map_fixed_noreplace
write_to_hugetlbfs
CFLAGS = -Wall -I ../../../../usr/include $(EXTRA_CFLAGS)
LDLIBS = -lrt
TEST_GEN_FILES = compaction_test
-TEST_GEN_FILES += gup_benchmark
+TEST_GEN_FILES += gup_test
TEST_GEN_FILES += hmm-tests
TEST_GEN_FILES += hugepage-mmap
TEST_GEN_FILES += hugepage-shm
CONFIG_TEST_VMALLOC=m
CONFIG_DEVICE_PRIVATE=y
CONFIG_TEST_HMM=m
-CONFIG_GUP_BENCHMARK=y
+CONFIG_GUP_TEST=y
#define MB (1UL << 20)
#define PAGE_SIZE sysconf(_SC_PAGESIZE)
-#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark)
-#define GUP_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
+#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
+#define GUP_BENCHMARK _IOWR('g', 2, struct gup_test)
/* Similar to above, but use FOLL_PIN instead of FOLL_GET. */
-#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
-#define PIN_BENCHMARK _IOWR('g', 4, struct gup_benchmark)
-#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark)
+#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_test)
+#define PIN_BENCHMARK _IOWR('g', 4, struct gup_test)
+#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_test)
/* Just the flags we need, copied from mm.h: */
#define FOLL_WRITE 0x01 /* check pte is writable */
-struct gup_benchmark {
+struct gup_test {
__u64 get_delta_usec;
__u64 put_delta_usec;
__u64 addr;
int main(int argc, char **argv)
{
- struct gup_benchmark gup;
+ struct gup_test gup;
unsigned long size = 128 * MB;
int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE;
if (write)
gup.flags |= FOLL_WRITE;
- fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR);
+ fd = open("/sys/kernel/debug/gup_test", O_RDWR);
if (fd == -1) {
perror("open");
exit(1);
fi
echo "--------------------------------------------"
-echo "running 'gup_benchmark -U' (normal/slow gup)"
+echo "running 'gup_test -U' (normal/slow gup)"
echo "--------------------------------------------"
-./gup_benchmark -U
+./gup_test -U
if [ $? -ne 0 ]; then
echo "[FAIL]"
exitcode=1
fi
echo "------------------------------------------"
-echo "running gup_benchmark -b (pin_user_pages)"
+echo "running gup_test -b (pin_user_pages)"
echo "------------------------------------------"
-./gup_benchmark -b
+./gup_test -b
if [ $? -ne 0 ]; then
echo "[FAIL]"
exitcode=1
projects / platform / kernel / linux-starfive.git / commitdiff