[LTP] [PATCH v4 0/3] mm/thp: add two new case

[LTP] [PATCH v4 0/3] mm/thp: add two new case

[Zhouping Liu]

The patchset is desinged to test THP functionality.

when one process allocate hugepage aligned anonymouse pages,
kernel thread 'khugepaged' controlled by sysfs knobs
/sys/kernel/mm/transparent_hugepage/* will scan them, and make
them as transparent hugepage if they are suited, you can find out
how many transparent hugepages are there in one process from
/proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
stand for transparent hugepage.

v1 to v2:
accepted Wanlong's suggestion, added some comment for '10s'
added 'static' key word for single-file-only variant.

v2 to v3:
added some comments for low memory system.

v3 to v4:
Wanglong point out that the value of khugepaged/defrag is string type,
not a numeric before applying the commit e27e6151b154 in v2.6.39-rc4,
and I checked the code again, found the current cases thp0* don't be
effected by khugepaged/defrag, so I removed the checking of
khugepaged/defrag from khugepaged_scan_done().

Zhouping Liu (3):
  mm/thp: new case thp04.c
  lib/mem: introduce a new function set_global_mempolicy()
  mm/thp: add new case thp05

 runtest/mm                         |   6 ++
 testcases/kernel/mem/include/mem.h |  12 +++
 testcases/kernel/mem/lib/mem.c     | 198 ++++++++++++++++++++++++++++++++++++-
 testcases/kernel/mem/thp/thp04.c   | 136 +++++++++++++++++++++++++
 testcases/kernel/mem/thp/thp05.c   | 152 ++++++++++++++++++++++++++++
 5 files changed, 503 insertions(+), 1 deletion(-)
 create mode 100644 testcases/kernel/mem/thp/thp04.c
 create mode 100644 testcases/kernel/mem/thp/thp05.c

-- 
1.7.11.7


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[LTP] [PATCH v4 1/3] mm/thp: new case thp04.c

[Zhouping Liu]

The case is desinged to test THP functionality.

when one process allocate hugepage aligned anonymouse pages,
kernel thread 'khugepaged' controlled by sysfs knobs
/sys/kernel/mm/transparent_hugepage/* will scan them, and make
them as transparent hugepage if they are suited, you can find out
how many transparent hugepages are there in one process from
/proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
stand for transparent hugepage.

Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Zhouping Liu <zliu@redhat.com>
---
 runtest/mm                         |   3 +
 testcases/kernel/mem/include/mem.h |  11 +++
 testcases/kernel/mem/lib/mem.c     | 187 +++++++++++++++++++++++++++++++++++++
 testcases/kernel/mem/thp/thp04.c   | 136 +++++++++++++++++++++++++++
 4 files changed, 337 insertions(+)
 create mode 100644 testcases/kernel/mem/thp/thp04.c

diff --git a/runtest/mm b/runtest/mm
index 56b83f8..3fbb20f 100644
--- a/runtest/mm
+++ b/runtest/mm
@@ -84,6 +84,9 @@ swapping01 swapping01 -i 5
 thp01 thp01 -I 120
 thp02 thp02
 thp03 thp03
+thp04_1 thp04
+thp04_2 thp04 -n 10 -N 20
+thp04_3 thp04 -n 1 -N 300
 
 vma01 vma01
 vma02 vma02
diff --git a/testcases/kernel/mem/include/mem.h b/testcases/kernel/mem/include/mem.h
index fdf558e..ccae47d 100644
--- a/testcases/kernel/mem/include/mem.h
+++ b/testcases/kernel/mem/include/mem.h
@@ -32,6 +32,17 @@ void testoom(int mempolicy, int lite);
 
 #define PATH_KSM		"/sys/kernel/mm/ksm/"
 
+/* THP */
+
+#define PATH_THP		"/sys/kernel/mm/transparent_hugepage/"
+#define PATH_KHPD		PATH_THP "khugepaged/"
+
+int opt_nr_child, opt_nr_thps;
+char *opt_nr_child_str, *opt_nr_thps_str;
+void test_transparent_hugepage(int nr_child, int nr_thps, int hg_aligned);
+void check_thp_options(int *nr_child, int *nr_thps);
+void thp_usage(void);
+
 /* HUGETLB */
 
 #define PATH_SHMMAX		"/proc/sys/kernel/shmmax"
diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c
index c9525e5..3f9bbfd 100644
--- a/testcases/kernel/mem/lib/mem.c
+++ b/testcases/kernel/mem/lib/mem.c
@@ -501,6 +501,193 @@ void ksm_usage(void)
 	printf("  -u      Memory allocation unit in MB\n");
 }
 
+/* THP */
+
+static int alloc_transparent_hugepages(int nr_thps, int hg_aligned)
+{
+	unsigned long hugepagesize, size;
+	void *addr;
+	int ret;
+
+	hugepagesize = read_meminfo("Hugepagesize:") * KB;
+	size = nr_thps * hugepagesize;
+
+	if (hg_aligned) {
+		ret = posix_memalign(&addr, hugepagesize, size);
+		if (ret != 0) {
+			printf("posix_memalign failed\n");
+			return -1;
+		}
+	} else {
+		addr = mmap(NULL, size, PROT_READ|PROT_WRITE,
+			    MAP_PRIVATE|MAP_ANON, -1, 0);
+		if (addr == MAP_FAILED) {
+			perror("mmap");
+			return -1;
+		}
+	}
+
+	memset(addr, 10, size);
+
+	tst_resm(TINFO, "child[%d] stop here", getpid());
+	/*
+	 * stop here, until the father finish to calculate
+	 * all the transparent hugepages.
+	 */
+	if (raise(SIGSTOP) == -1) {
+		perror("kill");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void khugepaged_scan_done(void)
+{
+	int changing = 1, count = 0;
+	long old_pages_collapsed, old_max_ptes_none, old_pages_to_scan;
+	long pages_collapsed = 0, max_ptes_none = 0, pages_to_scan = 0;
+
+	while (changing) {
+		/*
+		 * as 'khugepaged' run 100% during testing, so 10s
+		 * is an enough for us to recognize if 'khugepaged'
+		 * finish scanning proceses' anonymouse hugepages
+		 * or not.
+		 */
+		sleep(10);
+		count++;
+
+		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_collapsed",
+			       "%ld", &pages_collapsed);
+		SAFE_FILE_SCANF(cleanup, PATH_KHPD "max_ptes_none",
+			       "%ld", &max_ptes_none);
+		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_to_scan",
+			       "%ld", &pages_to_scan);
+
+		if (pages_collapsed != old_pages_collapsed ||
+		    max_ptes_none != old_max_ptes_none ||
+		    pages_to_scan != old_pages_to_scan) {
+			old_pages_collapsed = pages_collapsed;
+			old_max_ptes_none = max_ptes_none;
+			old_pages_to_scan = pages_to_scan;
+		} else {
+			changing = 0;
+		}
+	}
+
+	tst_resm(TINFO, "khugepaged daemon takes %ds to scan all thp pages",
+		 count * 10);
+}
+
+static void verify_thp_size(int *child, int nr_child, int nr_thps)
+{
+	FILE *fp;
+	char path[BUFSIZ], buf[BUFSIZ], line[BUFSIZ];
+	int i, ret;
+	long expect_thps; /* the amount of per child's transparent hugepages */
+	long val, actual_thps;
+	long hugepagesize;
+
+	hugepagesize = read_meminfo("Hugepagesize:");
+	expect_thps = nr_thps * hugepagesize;
+
+	for (i = 0; i < nr_child; i++) {
+		actual_thps = 0;
+
+		snprintf(path, BUFSIZ, "/proc/%d/smaps", child[i]);
+		fp = fopen(path, "r");
+		while (fgets(line, BUFSIZ, fp) != NULL) {
+			ret = sscanf(line, "%64s %ld", buf, &val);
+			if (ret == 2 && val != 0) {
+				if (strcmp(buf, "AnonHugePages:") == 0)
+					actual_thps += val;
+			}
+		}
+
+		if (actual_thps != expect_thps)
+			tst_resm(TFAIL, "child[%d] got %ldKB thps - expect %ld"
+				"KB thps", getpid(), actual_thps, expect_thps);
+		fclose(fp);
+	}
+}
+
+void test_transparent_hugepage(int nr_child, int nr_thps, int hg_aligned)
+{
+	unsigned long hugepagesize, memfree;
+	int i, *pid, ret, status;
+	char path[BUFSIZ];
+
+	memfree = read_meminfo("MemFree:");
+	tst_resm(TINFO, "The current MemFree is %luMB", memfree / KB);
+	if (memfree < MB)
+		tst_resm(TWARN, "The system has low memory, which maybe "
+				"cause the case failed");
+
+	hugepagesize = read_meminfo("Hugepagesize:");
+
+	pid = malloc(nr_child * sizeof(int));
+	if (pid == NULL)
+		tst_brkm(TBROK | TERRNO, cleanup, "malloc");
+
+	for (i = 0; i < nr_child; i++) {
+		switch (pid[i] = fork()) {
+		case -1:
+			tst_brkm(TBROK | TERRNO, cleanup, "fork");
+
+		case 0:
+			ret = alloc_transparent_hugepages(nr_thps, hg_aligned);
+			exit(ret);
+		}
+	}
+
+	tst_resm(TINFO, "Stop all children...");
+	for (i = 0; i < nr_child; i++) {
+		if (waitpid(pid[i], &status, WUNTRACED) == -1)
+			tst_brkm(TBROK|TERRNO, cleanup, "waitpid");
+		if (!WIFSTOPPED(status))
+			tst_brkm(TBROK, cleanup,
+				 "child[%d] was not stoppted", pid[i]);
+	}
+
+	tst_resm(TINFO, "Start to scan all transparent hugepages...");
+	khugepaged_scan_done();
+
+	tst_resm(TINFO, "Start to verify transparent hugepage size...");
+	verify_thp_size(pid, nr_child, nr_thps);
+
+	tst_resm(TINFO, "Wake up all children...");
+	for (i = 0; i < nr_child; i++) {
+		if (kill(pid[i], SIGCONT) == -1)
+			tst_brkm(TBROK | TERRNO, cleanup,
+				 "signal continue child[%d]", pid[i]);
+	}
+
+	/* wait all children finish himself task */
+	for (i = 0; i < nr_child; i++) {
+		if (waitpid(pid[i], &status, 0) == -1)
+			tst_brkm(TBROK|TERRNO, cleanup, "waitpid %d", pid[i]);
+
+		if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
+			tst_resm(TFAIL, "the child[%d] unexpectedly failed:"
+				 " %d", pid[i], status);
+	}
+}
+
+void check_thp_options(int *nr_child, int *nr_thps)
+{
+	if (opt_nr_child)
+		*nr_child = SAFE_STRTOL(NULL, opt_nr_child_str, 0, LONG_MAX);
+	if (opt_nr_thps)
+		*nr_thps = SAFE_STRTOL(NULL, opt_nr_thps_str, 0, LONG_MAX);
+}
+
+void thp_usage(void)
+{
+	printf("  -n      Number of processes\n");
+	printf("  -N      Number of transparent hugepages\n");
+}
+
 /* cpuset/memcg */
 
 static void gather_node_cpus(char *cpus, long nd)
diff --git a/testcases/kernel/mem/thp/thp04.c b/testcases/kernel/mem/thp/thp04.c
new file mode 100644
index 0000000..0f6c553
--- /dev/null
+++ b/testcases/kernel/mem/thp/thp04.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2013 Linux Test Project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it
+ * is free of the rightful claim of any third person regarding
+ * infringement or the like.  Any license provided herein, whether
+ * implied or otherwise, applies only to this software file.  Patent
+ * licenses, if any, provided herein do not apply to combinations of
+ * this program with other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * The case is designed to test the functionality of transparent
+ * hugepage - THP
+ *
+ * when one process allocate hugepage aligned anonymouse pages,
+ * kernel thread 'khugepaged' controlled by sysfs knobs
+ * /sys/kernel/mm/transparent_hugepage/ will scan them, and make
+ * them as transparent hugepage if they are suited, you can find out
+ * how many transparent hugepages are there in one process from
+ * /proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
+ * stand for transparent hugepage.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "test.h"
+#include "usctest.h"
+#include "mem.h"
+
+char *TCID = "thp04";
+int TST_TOTAL = 1;
+
+option_t thp_options[] = {
+	{"n:", &opt_nr_child, &opt_nr_child_str},
+	{"N:", &opt_nr_thps, &opt_nr_thps_str},
+	{NULL, NULL, NULL}
+};
+
+static int pre_thp_scan_sleep_millisecs;
+static int pre_thp_alloc_sleep_millisecs;
+static char pre_thp_enabled[BUFSIZ];
+
+int main(int argc, char *argv[])
+{
+	int lc;
+	char *msg;
+	int nr_child = 2, nr_thps = 64;
+
+	msg = parse_opts(argc, argv, thp_options, thp_usage);
+	if (msg != NULL)
+		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
+	check_thp_options(&nr_child, &nr_thps);
+
+	setup();
+
+	tst_resm(TINFO, "Start to test transparent hugepage...");
+	tst_resm(TINFO, "There are %d children allocating %d "
+			"transparent hugepages", nr_child, nr_thps);
+
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+		tst_count = 0;
+
+		test_transparent_hugepage(nr_child, nr_thps, 1);
+	}
+
+	cleanup();
+	tst_exit();
+}
+
+void setup(void)
+{
+	char path[BUFSIZ];
+
+	tst_require_root(NULL);
+
+	if (access(PATH_THP, F_OK) == -1)
+		tst_brkm(TCONF, NULL, "THP is not enabled");
+
+	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
+	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_scan_sleep_millisecs);
+	/* set 0 to khugepaged/scan_sleep_millisecs to run khugepaged 100% */
+	SAFE_FILE_PRINTF(cleanup, path, "%d", 0);
+
+	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
+	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_alloc_sleep_millisecs);
+	/*
+	 * set 0 to khugepaged/alloc_sleep_millisecs to make sure khugepaged
+	 * don't stop if there's a hugepage allcation failure.
+	 */
+	SAFE_FILE_PRINTF(NULL, path, "%d", 0);
+
+	snprintf(path, BUFSIZ, PATH_THP "enabled");
+	write_file(path, "always");
+
+	tst_sig(FORK, DEF_HANDLER, NULL);
+	TEST_PAUSE;
+}
+
+void cleanup(void)
+{
+	char path[BUFSIZ];
+
+	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
+	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_scan_sleep_millisecs);
+
+	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
+	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_alloc_sleep_millisecs);
+
+	snprintf(path, BUFSIZ, PATH_THP "enabled");
+	write_file(path, pre_thp_enabled);
+
+	TEST_CLEANUP;
+}
-- 
1.7.11.7


------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
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[LTP] [PATCH v4 2/3] lib/mem: introduce a new function set_global_mempolicy()

[Zhouping Liu]

Fork out a new function set_global_mempolicy() from the
previous testoom() func, which will be useful for other func.

Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Zhouping Liu <zliu@redhat.com>
---
 testcases/kernel/mem/lib/mem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c
index 3f9bbfd..35e8bc2 100644
--- a/testcases/kernel/mem/lib/mem.c
+++ b/testcases/kernel/mem/lib/mem.c
@@ -91,7 +91,7 @@ void oom(int testcase, int lite)
 	}
 }
 
-void testoom(int mempolicy, int lite)
+static void set_global_mempolicy(int mempolicy)
 {
 #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \
 	&& HAVE_MPOL_CONSTANTS
@@ -133,6 +133,11 @@ void testoom(int mempolicy, int lite)
 			tst_brkm(TBROK|TERRNO, cleanup, "set_mempolicy");
 	}
 #endif
+}
+
+void testoom(int mempolicy, int lite)
+{
+	set_global_mempolicy(mempolicy);
 
 	tst_resm(TINFO, "start normal OOM testing.");
 	oom(NORMAL, lite);
-- 
1.7.11.7


------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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[LTP] [PATCH v4 3/3] mm/thp: add new case thp05

[Zhouping Liu]

added new case thp05, which is used to test transparent hugepage
under mempolicy.

Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Zhouping Liu <zliu@redhat.com>
---
 runtest/mm                         |   3 +
 testcases/kernel/mem/include/mem.h |   3 +-
 testcases/kernel/mem/lib/mem.c     |   6 +-
 testcases/kernel/mem/thp/thp04.c   |   2 +-
 testcases/kernel/mem/thp/thp05.c   | 152 +++++++++++++++++++++++++++++++++++++
 5 files changed, 163 insertions(+), 3 deletions(-)
 create mode 100644 testcases/kernel/mem/thp/thp05.c

diff --git a/runtest/mm b/runtest/mm
index 3fbb20f..7c7abf1 100644
--- a/runtest/mm
+++ b/runtest/mm
@@ -87,6 +87,9 @@ thp03 thp03
 thp04_1 thp04
 thp04_2 thp04 -n 10 -N 20
 thp04_3 thp04 -n 1 -N 300
+thp05_1 thp05
+thp05_2 thp05 -n 10 -N 20
+thp05_3 thp05 -n 1 -N 300
 
 vma01 vma01
 vma02 vma02
diff --git a/testcases/kernel/mem/include/mem.h b/testcases/kernel/mem/include/mem.h
index ccae47d..6b020af 100644
--- a/testcases/kernel/mem/include/mem.h
+++ b/testcases/kernel/mem/include/mem.h
@@ -39,7 +39,8 @@ void testoom(int mempolicy, int lite);
 
 int opt_nr_child, opt_nr_thps;
 char *opt_nr_child_str, *opt_nr_thps_str;
-void test_transparent_hugepage(int nr_child, int nr_thps, int hg_aligned);
+void test_transparent_hugepage(int nr_child, int nr_thps,
+			       int hg_aligned, int mempolicy);
 void check_thp_options(int *nr_child, int *nr_thps);
 void thp_usage(void);
 
diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c
index 35e8bc2..0361eba 100644
--- a/testcases/kernel/mem/lib/mem.c
+++ b/testcases/kernel/mem/lib/mem.c
@@ -617,12 +617,16 @@ static void verify_thp_size(int *child, int nr_child, int nr_thps)
 	}
 }
 
-void test_transparent_hugepage(int nr_child, int nr_thps, int hg_aligned)
+void test_transparent_hugepage(int nr_child, int nr_thps,
+			       int hg_aligned, int mempolicy)
 {
 	unsigned long hugepagesize, memfree;
 	int i, *pid, ret, status;
 	char path[BUFSIZ];
 
+	if (mempolicy)
+		set_global_mempolicy(mempolicy);
+
 	memfree = read_meminfo("MemFree:");
 	tst_resm(TINFO, "The current MemFree is %luMB", memfree / KB);
 	if (memfree < MB)
diff --git a/testcases/kernel/mem/thp/thp04.c b/testcases/kernel/mem/thp/thp04.c
index 0f6c553..ff41f75 100644
--- a/testcases/kernel/mem/thp/thp04.c
+++ b/testcases/kernel/mem/thp/thp04.c
@@ -83,7 +83,7 @@ int main(int argc, char *argv[])
 	for (lc = 0; TEST_LOOPING(lc); lc++) {
 		tst_count = 0;
 
-		test_transparent_hugepage(nr_child, nr_thps, 1);
+		test_transparent_hugepage(nr_child, nr_thps, 1, 0);
 	}
 
 	cleanup();
diff --git a/testcases/kernel/mem/thp/thp05.c b/testcases/kernel/mem/thp/thp05.c
new file mode 100644
index 0000000..182ff73
--- /dev/null
+++ b/testcases/kernel/mem/thp/thp05.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2013 Linux Test Project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it
+ * is free of the rightful claim of any third person regarding
+ * infringement or the like.  Any license provided herein, whether
+ * implied or otherwise, applies only to this software file.  Patent
+ * licenses, if any, provided herein do not apply to combinations of
+ * this program with other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * The case is designed to test the functionality of transparent
+ * hugepage - THP under mempolicy (NUMA)
+ *
+ * when one process allocate hugepage aligned anonymouse pages,
+ * kernel thread 'khugepaged' controlled by sysfs knobs
+ * /sys/kernel/mm/transparent_hugepage/ will scan them, and make
+ * them as transparent hugepage if they are suited, you can find out
+ * how many transparent hugepages are there in one process from
+ * /proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
+ * stand for transparent hugepage.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "numa_helper.h"
+#include "test.h"
+#include "usctest.h"
+#include "mem.h"
+
+char *TCID = "thp05";
+int TST_TOTAL = 1;
+
+#if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \
+		&& HAVE_MPOL_CONSTANTS
+
+option_t thp_options[] = {
+	{"n:", &opt_nr_child, &opt_nr_child_str},
+	{"N:", &opt_nr_thps, &opt_nr_thps_str},
+	{NULL, NULL, NULL}
+};
+
+static int pre_thp_scan_sleep_millisecs;
+static int pre_thp_alloc_sleep_millisecs;
+static char pre_thp_enabled[BUFSIZ];
+
+int main(int argc, char *argv[])
+{
+	int lc;
+	char *msg;
+	int nr_child = 2, nr_thps = 64;
+
+	msg = parse_opts(argc, argv, thp_options, thp_usage);
+	if (msg != NULL)
+		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
+	check_thp_options(&nr_child, &nr_thps);
+
+	setup();
+
+	tst_resm(TINFO, "Start to test transparent hugepage...");
+	tst_resm(TINFO, "There are %d children allocating %d "
+			"transparent hugepages", nr_child, nr_thps);
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+		tst_count = 0;
+
+		tst_resm(TINFO, "THP on MPOL_BIND mempolicy...");
+		test_transparent_hugepage(nr_child, nr_thps, 1, MPOL_BIND);
+
+		tst_resm(TINFO, "THP on MPOL_INTERLEAVE mempolicy...");
+		test_transparent_hugepage(nr_child, nr_thps, 1,
+					  MPOL_INTERLEAVE);
+
+		tst_resm(TINFO, "THP on MPOL_PREFERRED mempolicy...");
+		test_transparent_hugepage(nr_child, nr_thps, 1, MPOL_PREFERRED);
+	}
+
+	cleanup();
+	tst_exit();
+}
+
+void setup(void)
+{
+	char path[BUFSIZ];
+
+	tst_require_root(NULL);
+
+	if (access(PATH_THP, F_OK) == -1)
+		tst_brkm(TCONF, NULL, "THP is not enabled");
+
+	if (!is_numa(NULL))
+		tst_brkm(TCONF, NULL, "The case need a NUMA system.");
+
+	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
+	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_scan_sleep_millisecs);
+	SAFE_FILE_PRINTF(cleanup, path, "%d", 0);
+
+	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
+	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_alloc_sleep_millisecs);
+	SAFE_FILE_PRINTF(NULL, path, "%d", 0);
+
+	snprintf(path, BUFSIZ, PATH_THP "enabled");
+	write_file(path, "always");
+
+	tst_sig(FORK, DEF_HANDLER, NULL);
+	TEST_PAUSE;
+}
+
+void cleanup(void)
+{
+	char path[BUFSIZ];
+
+	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
+	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_scan_sleep_millisecs);
+
+	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
+	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_alloc_sleep_millisecs);
+
+	snprintf(path, BUFSIZ, PATH_THP "enabled");
+	write_file(path, pre_thp_enabled);
+
+	TEST_CLEANUP;
+}
+
+#else /* no NUMA */
+int main(void)
+{
+	tst_brkm(TCONF, NULL, "no NUMA development packages installed.");
+}
+#endif
-- 
1.7.11.7


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Re: [LTP] [PATCH v4 1/3] mm/thp: new case thp04.c

[chrubis]

Hi!
> +static void khugepaged_scan_done(void)
> +{
> +	int changing = 1, count = 0;
> +	long old_pages_collapsed, old_max_ptes_none, old_pages_to_scan;
> +	long pages_collapsed = 0, max_ptes_none = 0, pages_to_scan = 0;
> +
> +	while (changing) {
> +		/*
> +		 * as 'khugepaged' run 100% during testing, so 10s
> +		 * is an enough for us to recognize if 'khugepaged'
> +		 * finish scanning proceses' anonymouse hugepages
                                                ^
                                             anonymous

> +		 * or not.
> +		 */
> +		sleep(10);
> +		count++;
> +
> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_collapsed",
> +			       "%ld", &pages_collapsed);
> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "max_ptes_none",
> +			       "%ld", &max_ptes_none);
> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_to_scan",
> +			       "%ld", &pages_to_scan);
> +
> +		if (pages_collapsed != old_pages_collapsed ||
> +		    max_ptes_none != old_max_ptes_none ||
> +		    pages_to_scan != old_pages_to_scan) {
> +			old_pages_collapsed = pages_collapsed;
> +			old_max_ptes_none = max_ptes_none;
> +			old_pages_to_scan = pages_to_scan;
> +		} else {
> +			changing = 0;
> +		}
> +	}
> +
> +	tst_resm(TINFO, "khugepaged daemon takes %ds to scan all thp pages",
> +		 count * 10);
> +}

Ah, so it acutally does polling, this is fine.

How long scanning takes. If it is about 10 seconds, we should poll
faster so that the testcase has chance to finish reasonably fast.
(if it takes 10 seconds and we miss the first windows it will sleep
 doing noting for another ten seconds)

> +static void verify_thp_size(int *child, int nr_child, int nr_thps)
> +{
> +	FILE *fp;
> +	char path[BUFSIZ], buf[BUFSIZ], line[BUFSIZ];
> +	int i, ret;
> +	long expect_thps; /* the amount of per child's transparent hugepages */
> +	long val, actual_thps;
> +	long hugepagesize;
> +
> +	hugepagesize = read_meminfo("Hugepagesize:");
> +	expect_thps = nr_thps * hugepagesize;
> +
> +	for (i = 0; i < nr_child; i++) {
> +		actual_thps = 0;
> +
> +		snprintf(path, BUFSIZ, "/proc/%d/smaps", child[i]);
> +		fp = fopen(path, "r");
> +		while (fgets(line, BUFSIZ, fp) != NULL) {
> +			ret = sscanf(line, "%64s %ld", buf, &val);
> +			if (ret == 2 && val != 0) {
> +				if (strcmp(buf, "AnonHugePages:") == 0)
> +					actual_thps += val;
> +			}
> +		}
> +
> +		if (actual_thps != expect_thps)
> +			tst_resm(TFAIL, "child[%d] got %ldKB thps - expect %ld"
> +				"KB thps", getpid(), actual_thps, expect_thps);
> +		fclose(fp);
> +	}
> +}
> +
> +void test_transparent_hugepage(int nr_child, int nr_thps, int hg_aligned)
> +{
> +	unsigned long hugepagesize, memfree;
> +	int i, *pid, ret, status;
> +	char path[BUFSIZ];
> +
> +	memfree = read_meminfo("MemFree:");
> +	tst_resm(TINFO, "The current MemFree is %luMB", memfree / KB);
> +	if (memfree < MB)
> +		tst_resm(TWARN, "The system has low memory, which maybe "
> +				"cause the case failed");

Hmm, TWARN is most likely wrong here, as it gets propagated into the
test return value. If it is known to fail on low memory, I would just
exit with TCONF and "Not enough memory for testing" message. Comments
anybody?

> +	hugepagesize = read_meminfo("Hugepagesize:");
> +
> +	pid = malloc(nr_child * sizeof(int));
> +	if (pid == NULL)
> +		tst_brkm(TBROK | TERRNO, cleanup, "malloc");

This is really small nit, but I would have named this array as 'pids'.

> +	for (i = 0; i < nr_child; i++) {
> +		switch (pid[i] = fork()) {
> +		case -1:
> +			tst_brkm(TBROK | TERRNO, cleanup, "fork");
> +
> +		case 0:
> +			ret = alloc_transparent_hugepages(nr_thps, hg_aligned);
> +			exit(ret);
> +		}
> +	}
> +
> +	tst_resm(TINFO, "Stop all children...");
> +	for (i = 0; i < nr_child; i++) {
> +		if (waitpid(pid[i], &status, WUNTRACED) == -1)
> +			tst_brkm(TBROK|TERRNO, cleanup, "waitpid");
> +		if (!WIFSTOPPED(status))
> +			tst_brkm(TBROK, cleanup,
> +				 "child[%d] was not stoppted", pid[i]);
> +	}
> +
> +	tst_resm(TINFO, "Start to scan all transparent hugepages...");
> +	khugepaged_scan_done();
> +
> +	tst_resm(TINFO, "Start to verify transparent hugepage size...");
> +	verify_thp_size(pid, nr_child, nr_thps);
> +
> +	tst_resm(TINFO, "Wake up all children...");
> +	for (i = 0; i < nr_child; i++) {
> +		if (kill(pid[i], SIGCONT) == -1)
> +			tst_brkm(TBROK | TERRNO, cleanup,
> +				 "signal continue child[%d]", pid[i]);
> +	}
> +
> +	/* wait all children finish himself task */
                                       ^
				    their tasks

> +	for (i = 0; i < nr_child; i++) {
> +		if (waitpid(pid[i], &status, 0) == -1)
> +			tst_brkm(TBROK|TERRNO, cleanup, "waitpid %d", pid[i]);
> +
> +		if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
> +			tst_resm(TFAIL, "the child[%d] unexpectedly failed:"
> +				 " %d", pid[i], status);
> +	}
> +}
> +
> +void check_thp_options(int *nr_child, int *nr_thps)
> +{
> +	if (opt_nr_child)
> +		*nr_child = SAFE_STRTOL(NULL, opt_nr_child_str, 0, LONG_MAX);
> +	if (opt_nr_thps)
> +		*nr_thps = SAFE_STRTOL(NULL, opt_nr_thps_str, 0, LONG_MAX);
> +}
> +
> +void thp_usage(void)
> +{
> +	printf("  -n      Number of processes\n");
> +	printf("  -N      Number of transparent hugepages\n");
> +}
> +
>  /* cpuset/memcg */
>  
>  static void gather_node_cpus(char *cpus, long nd)
> diff --git a/testcases/kernel/mem/thp/thp04.c b/testcases/kernel/mem/thp/thp04.c
> new file mode 100644
> index 0000000..0f6c553
> --- /dev/null
> +++ b/testcases/kernel/mem/thp/thp04.c
> @@ -0,0 +1,136 @@
> +/*
> + * Copyright (C) 2013 Linux Test Project
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of version 2 of the GNU General Public
> + * License as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + *
> + * Further, this software is distributed without any warranty that it
> + * is free of the rightful claim of any third person regarding
> + * infringement or the like.  Any license provided herein, whether
> + * implied or otherwise, applies only to this software file.  Patent
> + * licenses, if any, provided herein do not apply to combinations of
> + * this program with other software, or any other product whatsoever.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> + * 02110-1301, USA.
> + */
> +
> +/*
> + * The case is designed to test the functionality of transparent
> + * hugepage - THP
> + *
> + * when one process allocate hugepage aligned anonymouse pages,
> + * kernel thread 'khugepaged' controlled by sysfs knobs
> + * /sys/kernel/mm/transparent_hugepage/ will scan them, and make
> + * them as transparent hugepage if they are suited, you can find out
> + * how many transparent hugepages are there in one process from
> + * /proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
> + * stand for transparent hugepage.
> + */
> +
> +#include <sys/types.h>
> +#include <sys/mman.h>
> +#include <sys/stat.h>
> +#include <sys/wait.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <signal.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include "test.h"
> +#include "usctest.h"
> +#include "mem.h"
> +
> +char *TCID = "thp04";
> +int TST_TOTAL = 1;
> +
> +option_t thp_options[] = {
> +	{"n:", &opt_nr_child, &opt_nr_child_str},
> +	{"N:", &opt_nr_thps, &opt_nr_thps_str},
> +	{NULL, NULL, NULL}
> +};
> +
> +static int pre_thp_scan_sleep_millisecs;
> +static int pre_thp_alloc_sleep_millisecs;
> +static char pre_thp_enabled[BUFSIZ];
> +
> +int main(int argc, char *argv[])
> +{
> +	int lc;
> +	char *msg;
> +	int nr_child = 2, nr_thps = 64;
> +
> +	msg = parse_opts(argc, argv, thp_options, thp_usage);
> +	if (msg != NULL)
> +		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
> +	check_thp_options(&nr_child, &nr_thps);
> +
> +	setup();
> +
> +	tst_resm(TINFO, "Start to test transparent hugepage...");
> +	tst_resm(TINFO, "There are %d children allocating %d "
> +			"transparent hugepages", nr_child, nr_thps);
> +
> +	for (lc = 0; TEST_LOOPING(lc); lc++) {
> +		tst_count = 0;
> +
> +		test_transparent_hugepage(nr_child, nr_thps, 1);
> +	}
> +
> +	cleanup();
> +	tst_exit();
> +}
> +
> +void setup(void)
> +{
> +	char path[BUFSIZ];
> +
> +	tst_require_root(NULL);
> +
> +	if (access(PATH_THP, F_OK) == -1)
> +		tst_brkm(TCONF, NULL, "THP is not enabled");
> +
> +	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
> +	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_scan_sleep_millisecs);

The PATH_KPHD and "scan_sleep_millisecs" are both static strings and are
merged before they are passed to the snprintf() at compile time, which
results in printf format string __without__ any characters to
substitute. This is really weird.

> +	/* set 0 to khugepaged/scan_sleep_millisecs to run khugepaged 100% */
> +	SAFE_FILE_PRINTF(cleanup, path, "%d", 0);

I'm confused here, this is the only function in the setup that takes a
pointer to the cleanup defined bellow.

> +	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
> +	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_alloc_sleep_millisecs);
> +	/*
> +	 * set 0 to khugepaged/alloc_sleep_millisecs to make sure khugepaged
> +	 * don't stop if there's a hugepage allcation failure.
> +	 */
> +	SAFE_FILE_PRINTF(NULL, path, "%d", 0);
> +
> +	snprintf(path, BUFSIZ, PATH_THP "enabled");

Here as well.

> +	write_file(path, "always");

Where this came from? Does the function check for failures? Why not to
use SAFE_FILE_PRINTF() as the rest of the file?

> +	tst_sig(FORK, DEF_HANDLER, NULL);
> +	TEST_PAUSE;
> +}
> +
> +void cleanup(void)
> +{
> +	char path[BUFSIZ];
> +
> +	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
> +	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_scan_sleep_millisecs);
> +
> +	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
> +	SAFE_FILE_PRINTF(NULL, path, "%d", pre_thp_alloc_sleep_millisecs);
> +
> +	snprintf(path, BUFSIZ, PATH_THP "enabled");
> +	write_file(path, pre_thp_enabled);
> +

Same here.

> +	TEST_CLEANUP;
> +}
> -- 
> 1.7.11.7
> 
> 
> ------------------------------------------------------------------------------
> Precog is a next-generation analytics platform capable of advanced
> analytics on semi-structured data. The platform includes APIs for building
> apps and a phenomenal toolset for data science. Developers can use
> our toolset for easy data analysis & visualization. Get a free account!
> http://www2.precog.com/precogplatform/slashdotnewsletter
> _______________________________________________
> Ltp-list mailing list
> Ltp-list@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/ltp-list

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
_______________________________________________
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Re: [LTP] [PATCH v4 3/3] mm/thp: add new case thp05

[chrubis]

Hi!
> +	snprintf(path, BUFSIZ, PATH_KHPD "scan_sleep_millisecs");
> +	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_scan_sleep_millisecs);
> +	SAFE_FILE_PRINTF(cleanup, path, "%d", 0);
> +
> +	snprintf(path, BUFSIZ, PATH_KHPD "alloc_sleep_millisecs");
> +	SAFE_FILE_SCANF(NULL, path, "%d", &pre_thp_alloc_sleep_millisecs);
> +	SAFE_FILE_PRINTF(NULL, path, "%d", 0);
> +
> +	snprintf(path, BUFSIZ, PATH_THP "enabled");
> +	write_file(path, "always");

Same as the previous one. Remove the useless snprintf() and pass the
strings directly.

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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Re: [LTP] [PATCH v4 1/3] mm/thp: new case thp04.c

[chrubis]

Hi!
> >> +		 * or not.
> >> +		 */
> >> +		sleep(10);
> >> +		count++;
> >> +
> >> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_collapsed",
> >> +			       "%ld", &pages_collapsed);
> >> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "max_ptes_none",
> >> +			       "%ld", &max_ptes_none);
> >> +		SAFE_FILE_SCANF(cleanup, PATH_KHPD "pages_to_scan",
> >> +			       "%ld", &pages_to_scan);
> >> +
> >> +		if (pages_collapsed != old_pages_collapsed ||
> >> +		    max_ptes_none != old_max_ptes_none ||
> >> +		    pages_to_scan != old_pages_to_scan) {
> >> +			old_pages_collapsed = pages_collapsed;
> >> +			old_max_ptes_none = max_ptes_none;
> >> +			old_pages_to_scan = pages_to_scan;
> >> +		} else {
> >> +			changing = 0;
> >> +		}
> >> +	}
> >> +
> >> +	tst_resm(TINFO, "khugepaged daemon takes %ds to scan all thp pages",
> >> +		 count * 10);
> >> +}
> > Ah, so it acutally does polling, this is fine.
> >
> > How long scanning takes. If it is about 10 seconds, we should poll
> > faster so that the testcase has chance to finish reasonably fast.
> > (if it takes 10 seconds and we miss the first windows it will sleep
> >   doing noting for another ten seconds)
> 
> so how about 5 seconds? I will test the value on different systems.

If the scan takes 10 seconds to finish I would go for 2 seconds sleep as
that can increase the duration maximally by 20%, which is not as bad as
100% or 50%. The overhead of opening and reading a file should be really
small.

> >> +	write_file(path, "always");
> > Where this came from? Does the function check for failures? Why not to
> > use SAFE_FILE_PRINTF() as the rest of the file?
> 
> yes, there's some confused issue here.
> 
> but I have tried to use SAFE_FILE_PRINTF, but it didn't work fine for 
> transparent_hugepage/enabled,
> if # cat /sys/kernel/mm/transparent_hugepage/enabled
>        always [madvise] never
> SAFE_FILE_PRINTF only get 'always', expected 'madvise'
> if # cat /sys/kernel/mm/transparent_hugepage/enabled
> [always] madvise never
> SAFE_FILE_PRINTF get '[always]', expected 'always'
> 
> I didn't find the reason why SAFE_FILE_PRINTF couldn't get the expected 
> value?

That is strange, the only difference is that SAFE_FILE_PRINTF() uses
FILE interface while write_file() uses file descriptor directly.
Otherwise they should do exactly the same in this case. If they don't
something is broken.

Do you have a snipped of code that misbehaves this way?

-- 
Cyril Hrubis
chrubis@suse.cz

------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
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[LTP] [PATCH v4 3/3] mm/thp: add new case thp05

[Zhouping Liu]

added new case thp05, which is used to test transparent hugepage
under mempolicy - NUMA.

Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Zhouping Liu <zliu@redhat.com>
---
 runtest/mm                       |   3 +
 testcases/kernel/mem/thp/thp05.c | 153 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 156 insertions(+)
 create mode 100644 testcases/kernel/mem/thp/thp05.c

diff --git a/runtest/mm b/runtest/mm
index 3fbb20f..7c7abf1 100644
--- a/runtest/mm
+++ b/runtest/mm
@@ -87,6 +87,9 @@ thp03 thp03
 thp04_1 thp04
 thp04_2 thp04 -n 10 -N 20
 thp04_3 thp04 -n 1 -N 300
+thp05_1 thp05
+thp05_2 thp05 -n 10 -N 20
+thp05_3 thp05 -n 1 -N 300
 
 vma01 vma01
 vma02 vma02
diff --git a/testcases/kernel/mem/thp/thp05.c b/testcases/kernel/mem/thp/thp05.c
new file mode 100644
index 0000000..8b595ca
--- /dev/null
+++ b/testcases/kernel/mem/thp/thp05.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2013 Linux Test Project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it
+ * is free of the rightful claim of any third person regarding
+ * infringement or the like.  Any license provided herein, whether
+ * implied or otherwise, applies only to this software file.  Patent
+ * licenses, if any, provided herein do not apply to combinations of
+ * this program with other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * The case is designed to test the functionality of transparent
+ * hugepage - THP under mempolicy (NUMA)
+ *
+ * when one process allocate hugepage aligned anonymous pages,
+ * kernel thread 'khugepaged' controlled by sysfs knobs
+ * /sys/kernel/mm/transparent_hugepage/ will scan them, and make
+ * them as transparent hugepage if they are suited, you can find out
+ * how many transparent hugepages are there in one process from
+ * /proc/<pid>/smaps, among the file contents, 'AnonHugePages' entry
+ * stand for transparent hugepage.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "numa_helper.h"
+#include "test.h"
+#include "usctest.h"
+#include "mem.h"
+
+char *TCID = "thp05";
+int TST_TOTAL = 1;
+
+#if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \
+		&& HAVE_MPOL_CONSTANTS
+
+option_t thp_options[] = {
+	{"n:", &opt_nr_children, &opt_nr_children_str},
+	{"N:", &opt_nr_thps, &opt_nr_thps_str},
+	{NULL, NULL, NULL}
+};
+
+static int pre_thp_scan_sleep_millisecs;
+static int pre_thp_alloc_sleep_millisecs;
+static char pre_thp_enabled[BUFSIZ];
+
+int main(int argc, char *argv[])
+{
+	int lc;
+	char *msg;
+	int nr_children = 2, nr_thps = 64;
+
+	msg = parse_opts(argc, argv, thp_options, thp_usage);
+	if (msg != NULL)
+		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
+	check_thp_options(&nr_children, &nr_thps);
+
+	setup();
+
+	tst_resm(TINFO, "Start to test transparent hugepage...");
+	tst_resm(TINFO, "There are %d children allocating %d "
+			"transparent hugepages", nr_children, nr_thps);
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+		tst_count = 0;
+
+		tst_resm(TINFO, "THP on MPOL_BIND mempolicy...");
+		test_transparent_hugepage(nr_children, nr_thps, 1, MPOL_BIND);
+
+		tst_resm(TINFO, "THP on MPOL_INTERLEAVE mempolicy...");
+		test_transparent_hugepage(nr_children, nr_thps, 1,
+					  MPOL_INTERLEAVE);
+
+		tst_resm(TINFO, "THP on MPOL_PREFERRED mempolicy...");
+		test_transparent_hugepage(nr_children, nr_thps, 1,
+					  MPOL_PREFERRED);
+	}
+
+	cleanup();
+	tst_exit();
+}
+
+void setup(void)
+{
+	tst_require_root(NULL);
+
+	if (access(PATH_THP, F_OK) == -1)
+		tst_brkm(TCONF, NULL, "THP is not enabled");
+
+	if (!is_numa(NULL))
+		tst_brkm(TCONF, NULL, "The case need a NUMA system.");
+
+	SAFE_FILE_SCANF(NULL, PATH_KHPD "scan_sleep_millisecs",
+			"%d", &pre_thp_scan_sleep_millisecs);
+	SAFE_FILE_PRINTF(NULL, PATH_KHPD "scan_sleep_millisecs", "0");
+
+	SAFE_FILE_SCANF(NULL, PATH_KHPD "alloc_sleep_millisecs",
+			"%d", &pre_thp_alloc_sleep_millisecs);
+	SAFE_FILE_PRINTF(NULL, PATH_KHPD "alloc_sleep_millisecs", "0");
+
+	SAFE_FILE_SCANF(NULL, PATH_THP "enabled", "%[^\n]", pre_thp_enabled);
+	SAFE_FILE_PRINTF(NULL, PATH_THP "enabled", "always");
+
+	tst_sig(FORK, DEF_HANDLER, NULL);
+	TEST_PAUSE;
+}
+
+void cleanup(void)
+{
+	SAFE_FILE_PRINTF(NULL, PATH_KHPD "scan_sleep_millisecs",
+			 "%d", pre_thp_scan_sleep_millisecs);
+
+	SAFE_FILE_PRINTF(NULL, PATH_KHPD "alloc_sleep_millisecs",
+			 "%d", pre_thp_alloc_sleep_millisecs);
+
+	if (strcmp(pre_thp_enabled, "[always] madvise never") == 0)
+		SAFE_FILE_PRINTF(NULL, PATH_THP "enabled", "always");
+	else if (strcmp(pre_thp_enabled, "always [madvise] never") == 0)
+		SAFE_FILE_PRINTF(NULL, PATH_THP "enabled", "madvise");
+	else
+		SAFE_FILE_PRINTF(NULL, PATH_THP "enabled", "never");
+
+	TEST_CLEANUP;
+}
+
+#else /* no NUMA */
+int main(void)
+{
+	tst_brkm(TCONF, NULL, "no NUMA development packages installed.");
+}
+#endif
-- 
1.7.11.7


------------------------------------------------------------------------------
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analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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