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authorJohn Hubbard <jhubbard@nvidia.com>2020-12-15 06:05:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 23:13:38 +0300
commit9c84f229268fa229e250b7225611d0eb7094fea0 (patch)
tree065d92c78996894ff34a8edcddcae3051c78b35e /mm
parent800bca7c56023c2a89fe9a206a56f3788b54f767 (diff)
downloadlinux-9c84f229268fa229e250b7225611d0eb7094fea0.tar.xz
mm/gup_benchmark: rename to mm/gup_test
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig15
-rw-r--r--mm/Makefile2
-rw-r--r--mm/gup_test.c (renamed from mm/gup_benchmark.c)36
3 files changed, 29 insertions, 24 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 390165ffbb0f..e25e5cb2989f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -821,13 +821,18 @@ config PERCPU_STATS
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
diff --git a/mm/Makefile b/mm/Makefile
index d73aed0fc99c..069f216e109e 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -90,7 +90,7 @@ obj-$(CONFIG_PAGE_COUNTER) += page_counter.o
obj-$(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
diff --git a/mm/gup_benchmark.c b/mm/gup_test.c
index 8b3e5b5cd8fa..59472ea6aa39 100644
--- a/mm/gup_benchmark.c
+++ b/mm/gup_test.c
@@ -5,13 +5,13 @@
#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;
@@ -56,7 +56,7 @@ static void verify_dma_pinned(unsigned int cmd, struct page **pages,
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;
}
}
@@ -64,8 +64,8 @@ static void verify_dma_pinned(unsigned int cmd, struct page **pages,
}
}
-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;
@@ -164,10 +164,10 @@ free_pages:
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) {
@@ -184,7 +184,7 @@ static long gup_benchmark_ioctl(struct file *filep, unsigned int 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;
@@ -194,17 +194,17 @@ static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
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);