[PATCH 1/8] mm/gup_benchmark: rename to mm/gup_test

28 Sep 2020

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.
Signed-off-by: John Hubbard jhubbard@nvidia.com
---
 Documentation/core-api/pin_user_pages.rst     |  6 ++--
 arch/s390/configs/debug_defconfig             |  2 +-
 arch/s390/configs/defconfig                   |  2 +-
 mm/Kconfig                                    | 15 +++++---
 mm/Makefile                                   |  2 +-
 mm/{gup_benchmark.c => gup_test.c}            | 36 +++++++++----------
 tools/testing/selftests/vm/.gitignore         |  2 +-
 tools/testing/selftests/vm/Makefile           |  2 +-
 tools/testing/selftests/vm/config             |  2 +-
 .../vm/{gup_benchmark.c => gup_test.c}        | 16 ++++-----
 tools/testing/selftests/vm/run_vmtests        |  8 ++---
 11 files changed, 49 insertions(+), 44 deletions(-)
 rename mm/{gup_benchmark.c => gup_test.c} (80%)
 rename tools/testing/selftests/vm/{gup_benchmark.c => gup_test.c} (85%)

diff --git a/Documentation/core-api/pin_user_pages.rst b/Documentation/core-api/pin_user_pages.rst
index 7ca8c7bac650..eae972b23224 100644
--- a/Documentation/core-api/pin_user_pages.rst
+++ b/Documentation/core-api/pin_user_pages.rst
@@ -221,12 +221,12 @@ Unit testing
 ============
 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: ::
diff --git a/arch/s390/configs/debug_defconfig b/arch/s390/configs/debug_defconfig
index 0784bf3caf43..c624f4b1ad33 100644
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -100,7 +100,7 @@ CONFIG_ZSMALLOC_STAT=y
 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
diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
index 905bc8c4cfaf..878b89706998 100644
--- a/arch/s390/configs/defconfig
+++ b/arch/s390/configs/defconfig
@@ -94,7 +94,7 @@ CONFIG_ZSMALLOC_STAT=y
 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
diff --git a/mm/Kconfig b/mm/Kconfig
index 1896860cf23a..588984ee5fb4 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -834,13 +834,18 @@ 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 cae063dc8298..21fc9af33f9b 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
similarity index 80%
rename from mm/gup_benchmark.c
rename to mm/gup_test.c
index 464cae1fa3ea..10f41c0528de 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;
@@ -155,10 +155,10 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
    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) {
@@ -175,7 +175,7 @@ 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;
@@ -185,17 +185,17 @@ 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);
diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index 849e8226395a..2c8ddcf41c0e 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -15,7 +15,7 @@ userfaultfd
 mlock-intersect-test
 mlock-random-test
 virtual_address_range
-gup_benchmark
+gup_test
 va_128TBswitch
 map_fixed_noreplace
 write_to_hugetlbfs
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index 30873b19d04b..d1ae706d9927 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -23,7 +23,7 @@ MAKEFLAGS += --no-builtin-rules
 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
diff --git a/tools/testing/selftests/vm/config b/tools/testing/selftests/vm/config
index 69dd0d1aa30b..60e82da0de85 100644
--- a/tools/testing/selftests/vm/config
+++ b/tools/testing/selftests/vm/config
@@ -3,4 +3,4 @@ CONFIG_USERFAULTFD=y
 CONFIG_TEST_VMALLOC=m
 CONFIG_DEVICE_PRIVATE=y
 CONFIG_TEST_HMM=m
-CONFIG_GUP_BENCHMARK=y
+CONFIG_GUP_TEST=y
diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_test.c
similarity index 85%
rename from tools/testing/selftests/vm/gup_benchmark.c
rename to tools/testing/selftests/vm/gup_test.c
index 31f8bb086907..e930135727a2 100644
--- a/tools/testing/selftests/vm/gup_benchmark.c
+++ b/tools/testing/selftests/vm/gup_test.c
@@ -14,18 +14,18 @@
 #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;
@@ -37,7 +37,7 @@ struct gup_benchmark {
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;
@@ -104,7 +104,7 @@ int main(int argc, char **argv)
    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);
diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests
index a3f4f30f0a2e..d1843d5f3c30 100755
--- a/tools/testing/selftests/vm/run_vmtests
+++ b/tools/testing/selftests/vm/run_vmtests
@@ -124,9 +124,9 @@ else
 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
@@ -135,9 +135,9 @@ else
 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
-- 
2.28.0


    

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[PATCH 1/8] mm/gup_benchmark: rename to mm/gup_test