selftests: add a test program for variable huge page sizes in mmap/shmget

Also remove -Wextra because gcc-4.6 emits lots of irritating
signed/unsigned comparison warnings.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;
+}