[igt-dev] [RFT i-g-t 1/2] tests/gem_shrink: Background, direct and OOM shrinker plus userptr tests

Tvrtko Ursulin
2018-12-07T08:59:28Z

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

...

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
tests/i915/gem_shrink.c | 213 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 213 insertions(+)

diff --git a/tests/i915/gem_shrink.c b/tests/i915/gem_shrink.c
index c8e05814ee70..acc12efed15e 100644
--- a/tests/i915/gem_shrink.c
+++ b/tests/i915/gem_shrink.c
@@ -26,6 +26,9 @@
*
* Exercise the shrinker by overallocating GEM objects
*/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>

#include "igt.h"
#include "igt_gt.h"
@@ -366,6 +369,210 @@ static void reclaim(unsigned engine, int timeout)
close(fd);
}

+static unsigned long get_meminfo(const char *info, const char *tag)
+{
+ const char *str;
+ unsigned long val;
+
+ str = strstr(info, tag);
+ if (str && sscanf(str + strlen(tag), " %lu", &val) == 1)
+ return val >> 10;
+
+ igt_warn("Unrecognised /proc/meminfo field: '%s'\n", tag);
+ return 0;
+}
+
+static unsigned long get_avail_ram_mb(void)
+{
+ int fd;
+ int ret;
+ char buf[4096];
+ unsigned long ram;
+
+ fd = open("/proc/meminfo", O_RDONLY);
+ igt_assert_fd(fd);
+
+ ret = read(fd, buf, sizeof(buf));
+ igt_assert(ret >= 0);
+
+ close(fd);
+
+ ram = get_meminfo(buf, "MemAvailable:");
+ ram += get_meminfo(buf, "Buffers:");
+ ram += get_meminfo(buf, "Cached:");
+ ram += get_meminfo(buf, "SwapCached:");
+
+ return ram;
+}
+
+struct test {
+#define TEST_BO (1)
+#define TEST_USERPTR (2)
+ unsigned int flags;
+ int fd;
+};
+
+static uint32_t __get_pages(int fd, unsigned long alloc)
+{
+ uint32_t handle = gem_create(fd, alloc);
+
+ gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, 0);
+ gem_madvise(fd, handle, I915_MADV_DONTNEED);
+
+ return handle;
+}
+
+struct test_obj {
+ void *ptr;
+ uint32_t handle;
+};
+
+static void
+__get_userptr(int fd, struct test_obj *obj, unsigned long sz)
+{
+ struct local_i915_gem_userptr userptr = { };
+ void *ptr;
+
+ igt_assert_eq(sz & 4095, 0);
+
+ ptr = mmap(NULL, sz, PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(ptr != MAP_FAILED);
+
+ userptr.user_size = sz;
+ userptr.user_ptr = to_user_pointer(ptr);
+ do_ioctl(fd, LOCAL_IOCTL_I915_GEM_USERPTR, &userptr);
+
+ gem_set_domain(fd, userptr.handle, I915_GEM_DOMAIN_GTT, 0);
+
+ obj->ptr = ptr;
+ obj->handle = userptr.handle;
+}
+
+#define PAGE_SIZE 4096
+static void *mempressure(void *arg)
+{
+ struct test_obj *list = NULL;
+ struct test *test = arg;
+ const unsigned int sz_mb = 2;
+ const unsigned int sz = sz_mb << 20;
+ unsigned int n = 0, max = 0;
+ unsigned int blocks;
+
+ while (true) {
+ unsigned long ram_mb = get_avail_ram_mb();
+
+ if (!list) {
+ blocks = ram_mb / sz_mb;
+ list = calloc(blocks, sizeof(*list));
+ igt_assert(list);
+ } else if (ram_mb < 256) {
+ blocks = max + 1;
+ }
+
+ if (list[n].ptr || list[n].handle) {
+ if (test->flags & TEST_BO)
+ gem_close(test->fd, list[n].handle);
+ else
+ munmap(list[n].ptr, sz);
+ }
+
+ if (test->flags & TEST_BO) {
+ list[n].handle = __get_pages(test->fd, sz);
+ } else if (test->flags & TEST_USERPTR) {
+ __get_userptr(test->fd, &list[n], sz);
+ } else {
+ list[n].ptr = mmap(NULL, sz, PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(list[n].ptr != MAP_FAILED);
+
+ madvise(list[n].ptr, sz, MADV_HUGEPAGE);
+
+ for (size_t page = 0; page < sz; page += PAGE_SIZE)
+ *(volatile uint32_t *)((unsigned char *)list[n].ptr + page) = 0;
+ }
+
+ if (n > max)
+ max = n;
+
+ n++;
+
+ if (n >= blocks)
+ n = 0;
+ }
+
+ return NULL;
+}
+
+static void oom_adjust(const char *score)
+{
+ int fd;
+
+ fd = open("/proc/self/oom_score_adj", O_WRONLY);
+ igt_assert_fd(fd);
+ igt_assert(write(fd, score, sizeof(score)) == sizeof(score));
+ close(fd);
+}
+
+static void trigger_oom(void)
+{
+ const char *cmd = "f";
+ int fd;
+
+ fd = open("/proc/sysrq-trigger", O_WRONLY);
+ igt_assert_fd(fd);
+ igt_assert(write(fd, cmd, sizeof(cmd)) == sizeof(cmd));
+ close(fd);
+}
+
+static void reclaim_oom(unsigned int flags)
+{
+ unsigned int count = 0;
+
+ igt_assert_eq(__builtin_popcount(flags), 1);
+
+ oom_adjust("-1000");
+
+ do {
+ struct igt_helper_process gem_child = { };
+ struct igt_helper_process mem_child = { };
+
+ igt_debug("Iteration %u...\n", ++count);
+
+ igt_fork_helper(&mem_child) {
+ struct test mem = { };
+
+ oom_adjust("500");
+ mempressure(&mem);
+ }
+
+ igt_fork_helper(&gem_child) {
+ struct test gem = { .flags = flags };
+
+ oom_adjust("500");
+
+ gem.fd = drm_open_driver(DRIVER_INTEL);
+ igt_require_gem(gem.fd);
+
+ mempressure(&gem);
+
+ close(gem.fd);
+ }
+
+ for (unsigned long ram_mb = 0;
+ (ram_mb = get_avail_ram_mb()) > 512;) {
+ igt_debug("[%u] %lu free mb\n", count, ram_mb);
+ sleep(1);
+ }
+
+ trigger_oom();
+
+ sleep(1);
+
+ igt_stop_helper(&mem_child);
+ igt_stop_helper(&gem_child);
+ } while (count < 5);
+}
+
igt_main
{
const struct test {
@@ -432,6 +639,12 @@ igt_main
igt_subtest("reclaim")
reclaim(I915_EXEC_DEFAULT, 2);

+ igt_subtest("two-reclaims-and-oom")
+ reclaim_oom(TEST_BO);
+
+ igt_subtest("two-reclaims-and-oom-userptr")
+ reclaim_oom(TEST_USERPTR);
+
for(const struct test *t = tests; t->name; t++) {
for(const struct mode *m = modes; m->suffix; m++) {
igt_subtest_f("%s%s", t->name, m->suffix)
--
2.19.1