Merge branch 'akpm' (Andrew's patchbomb)

Merge misc updates from Andrew Morton:
 "About half of most of MM.  Going very early this time due to
  uncertainty over the coreautounifiednumasched things.  I'll send the
  other half of most of MM tomorrow.  The rest of MM awaits a slab merge
  from Pekka."

* emailed patches from Andrew Morton: (71 commits)
  memory_hotplug: ensure every online node has NORMAL memory
  memory_hotplug: handle empty zone when online_movable/online_kernel
  mm, memory-hotplug: dynamic configure movable memory and portion memory
  drivers/base/node.c: cleanup node_state_attr[]
  bootmem: fix wrong call parameter for free_bootmem()
  avr32, kconfig: remove HAVE_ARCH_BOOTMEM
  mm: cma: remove watermark hacks
  mm: cma: skip watermarks check for already isolated blocks in split_free_page()
  mm, oom: fix race when specifying a thread as the oom origin
  mm, oom: change type of oom_score_adj to short
  mm: cleanup register_node()
  mm, mempolicy: remove duplicate code
  mm/vmscan.c: try_to_freeze() returns boolean
  mm: introduce putback_movable_pages()
  virtio_balloon: introduce migration primitives to balloon pages
  mm: introduce compaction and migration for ballooned pages
  mm: introduce a common interface for balloon pages mobility
  mm: redefine address_space.assoc_mapping
  mm: adjust address_space_operations.migratepage() return code
  arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
  ...

2 files changed, 256 insertions, 2 deletions

diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index b336b24aa6c0..7300d0702efe 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -1,9 +1,9 @@
 # Makefile for vm selftests
 
 CC = $(CROSS_COMPILE)gcc
-CFLAGS = -Wall -Wextra
+CFLAGS = -Wall
 
-all: hugepage-mmap hugepage-shm  map_hugetlb
+all: hugepage-mmap hugepage-shm  map_hugetlb thuge-gen
 %: %.c
 	$(CC) $(CFLAGS) -o $@ $^
 
diff --git a/tools/testing/selftests/vm/thuge-gen.c b/tools/testing/selftests/vm/thuge-gen.c
new file mode 100644
index 000000000000..c87957295f74
--- /dev/null
+++ b/tools/testing/selftests/vm/thuge-gen.c
@@ -0,0 +1,254 @@
+/* Test selecting other page sizes for mmap/shmget.
+
+   Before running this huge pages for each huge page size must have been
+   reserved.
+   For large pages beyond MAX_ORDER (like 1GB on x86) boot options must be used.
+   Also shmmax must be increased.
+   And you need to run as root to work around some weird permissions in shm.
+   And nothing using huge pages should run in parallel.
+   When the program aborts you may need to clean up the shm segments with
+   ipcrm -m by hand, like this
+   sudo ipcs | awk '$1 == "0x00000000" {print $2}' | xargs -n1 sudo ipcrm -m
+   (warning this will remove all if someone else uses them) */
+
+#define _GNU_SOURCE 1
+#include <sys/mman.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/stat.h>
+#include <glob.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <string.h>
+
+#define err(x) perror(x), exit(1)
+
+#define MAP_HUGE_2MB    (21 << MAP_HUGE_SHIFT)
+#define MAP_HUGE_1GB    (30 << MAP_HUGE_SHIFT)
+#define MAP_HUGE_SHIFT  26
+#define MAP_HUGE_MASK   0x3f
+#define MAP_HUGETLB	0x40000
+
+#define SHM_HUGETLB     04000   /* segment will use huge TLB pages */
+#define SHM_HUGE_SHIFT  26
+#define SHM_HUGE_MASK   0x3f
+#define SHM_HUGE_2MB    (21 << SHM_HUGE_SHIFT)
+#define SHM_HUGE_1GB    (30 << SHM_HUGE_SHIFT)
+
+#define NUM_PAGESIZES   5
+
+#define NUM_PAGES 4
+
+#define Dprintf(fmt...) // printf(fmt)
+
+unsigned long page_sizes[NUM_PAGESIZES];
+int num_page_sizes;
+
+int ilog2(unsigned long v)
+{
+	int l = 0;
+	while ((1UL << l) < v)
+		l++;
+	return l;
+}
+
+void find_pagesizes(void)
+{
+	glob_t g;
+	int i;
+	glob("/sys/kernel/mm/hugepages/hugepages-*kB", 0, NULL, &g);
+	assert(g.gl_pathc <= NUM_PAGESIZES);
+	for (i = 0; i < g.gl_pathc; i++) {
+		sscanf(g.gl_pathv[i], "/sys/kernel/mm/hugepages/hugepages-%lukB",
+				&page_sizes[i]);
+		page_sizes[i] <<= 10;
+		printf("Found %luMB\n", page_sizes[i] >> 20);
+	}
+	num_page_sizes = g.gl_pathc;
+	globfree(&g);
+}
+
+unsigned long default_huge_page_size(void)
+{
+	unsigned long hps = 0;
+	char *line = NULL;
+	size_t linelen = 0;
+	FILE *f = fopen("/proc/meminfo", "r");
+	if (!f)
+		return 0;
+	while (getline(&line, &linelen, f) > 0) {
+		if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
+			hps <<= 10;
+			break;
+		}
+	}
+	free(line);
+	return hps;
+}
+
+void show(unsigned long ps)
+{
+	char buf[100];
+	if (ps == getpagesize())
+		return;
+	printf("%luMB: ", ps >> 20);
+	fflush(stdout);
+	snprintf(buf, sizeof buf,
+		"cat /sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
+		ps >> 10);
+	system(buf);
+}
+
+unsigned long read_sysfs(int warn, char *fmt, ...)
+{
+	char *line = NULL;
+	size_t linelen = 0;
+	char buf[100];
+	FILE *f;
+	va_list ap;
+	unsigned long val = 0;
+
+	va_start(ap, fmt);
+	vsnprintf(buf, sizeof buf, fmt, ap);
+	va_end(ap);
+
+	f = fopen(buf, "r");
+	if (!f) {
+		if (warn)
+			printf("missing %s\n", buf);
+		return 0;
+	}
+	if (getline(&line, &linelen, f) > 0) {
+		sscanf(line, "%lu", &val);
+	}
+	fclose(f);
+	free(line);
+	return val;
+}
+
+unsigned long read_free(unsigned long ps)
+{
+	return read_sysfs(ps != getpagesize(),
+			"/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
+			ps >> 10);
+}
+
+void test_mmap(unsigned long size, unsigned flags)
+{
+	char *map;
+	unsigned long before, after;
+	int err;
+
+	before = read_free(size);
+	map = mmap(NULL, size*NUM_PAGES, PROT_READ|PROT_WRITE,
+			MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB|flags, 0, 0);
+
+	if (map == (char *)-1) err("mmap");
+	memset(map, 0xff, size*NUM_PAGES);
+	after = read_free(size);
+	Dprintf("before %lu after %lu diff %ld size %lu\n",
+		before, after, before - after, size);
+	assert(size == getpagesize() || (before - after) == NUM_PAGES);
+	show(size);
+	err = munmap(map, size);
+	assert(!err);
+}
+
+void test_shmget(unsigned long size, unsigned flags)
+{
+	int id;
+	unsigned long before, after;
+	int err;
+
+	before = read_free(size);
+	id = shmget(IPC_PRIVATE, size * NUM_PAGES, IPC_CREAT|0600|flags);
+	if (id < 0) err("shmget");
+
+	struct shm_info i;
+	if (shmctl(id, SHM_INFO, (void *)&i) < 0) err("shmctl");
+	Dprintf("alloc %lu res %lu\n", i.shm_tot, i.shm_rss);
+
+
+	Dprintf("id %d\n", id);
+	char *map = shmat(id, NULL, 0600);
+	if (map == (char*)-1) err("shmat");
+
+	shmctl(id, IPC_RMID, NULL);
+
+	memset(map, 0xff, size*NUM_PAGES);
+	after = read_free(size);
+
+	Dprintf("before %lu after %lu diff %ld size %lu\n",
+		before, after, before - after, size);
+	assert(size == getpagesize() || (before - after) == NUM_PAGES);
+	show(size);
+	err = shmdt(map);
+	assert(!err);
+}
+
+void sanity_checks(void)
+{
+	int i;
+	unsigned long largest = getpagesize();
+
+	for (i = 0; i < num_page_sizes; i++) {
+		if (page_sizes[i] > largest)
+			largest = page_sizes[i];
+
+		if (read_free(page_sizes[i]) < NUM_PAGES) {
+			printf("Not enough huge pages for page size %lu MB, need %u\n",
+				page_sizes[i] >> 20,
+				NUM_PAGES);
+			exit(0);
+		}
+	}
+
+	if (read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest) {
+		printf("Please do echo %lu > /proc/sys/kernel/shmmax", largest * NUM_PAGES);
+		exit(0);
+	}
+
+#if defined(__x86_64__)
+	if (largest != 1U<<30) {
+		printf("No GB pages available on x86-64\n"
+		       "Please boot with hugepagesz=1G hugepages=%d\n", NUM_PAGES);
+		exit(0);
+	}
+#endif
+}
+
+int main(void)
+{
+	int i;
+	unsigned default_hps = default_huge_page_size();
+
+	find_pagesizes();
+
+	sanity_checks();
+
+	for (i = 0; i < num_page_sizes; i++) {
+		unsigned long ps = page_sizes[i];
+		int arg = ilog2(ps) << MAP_HUGE_SHIFT;
+		printf("Testing %luMB mmap with shift %x\n", ps >> 20, arg);
+		test_mmap(ps, MAP_HUGETLB | arg);
+	}
+	printf("Testing default huge mmap\n");
+	test_mmap(default_hps, SHM_HUGETLB);
+
+	puts("Testing non-huge shmget");
+	test_shmget(getpagesize(), 0);
+
+	for (i = 0; i < num_page_sizes; i++) {
+		unsigned long ps = page_sizes[i];
+		int arg = ilog2(ps) << SHM_HUGE_SHIFT;
+		printf("Testing %luMB shmget with shift %x\n", ps >> 20, arg);
+		test_shmget(ps, SHM_HUGETLB | arg);
+	}
+	puts("default huge shmget");
+	test_shmget(default_hps, SHM_HUGETLB);
+
+	return 0;
+}