Fork and remap the same object into a new process space under a new file descriptor. Principally to check list management and find scaling issues in using such lists.
Signed-off-by: Chris Wilson <[email protected]> Cc: Abdiel Janulgue <[email protected]> --- tests/i915/gem_mmap_gtt.c | 72 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/tests/i915/gem_mmap_gtt.c b/tests/i915/gem_mmap_gtt.c index a5f9d934e..756940ca4 100644 --- a/tests/i915/gem_mmap_gtt.c +++ b/tests/i915/gem_mmap_gtt.c @@ -34,8 +34,9 @@ #include <inttypes.h> #include <pthread.h> #include <errno.h> -#include <sys/stat.h> #include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/wait.h> #include "drm.h" #include "igt.h" @@ -323,6 +324,73 @@ test_pf_nonblock(int i915) igt_spin_free(i915, spin); } +static void +test_fork_bomb(int i915) +{ + uint32_t *control; + uint32_t handle; + int dmabuf; + + /* Rebind the same object into many different process adress spaces. */ + + control = mmap(NULL, 4096, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0); + igt_assert(control != MAP_FAILED); + + handle = gem_create(i915, 4096); + dmabuf = prime_handle_to_fd(i915, handle); + gem_close(i915, handle); + + igt_fork(child, 1) { + int fd[512]; + + atomic_fetch_add(&control[1], 1); + while (!READ_ONCE(control[0])) { + int children; + + atomic_fetch_add(&control[2], 1); + + for (int i = 0; i < ARRAY_SIZE(fd); i++) { + fd[i] = gem_reopen_driver(i915); + + handle = prime_fd_to_handle(fd[i], dmabuf); + gem_mmap__gtt(fd[i], handle, 4096, PROT_WRITE); + gem_close(fd[i], handle); + + /* leave the fd + mmap for process cleanup */ + } + + for (children = 0; children < 2; children++) { + if (fork() > 0) { /* child */ + atomic_fetch_add(&control[1], 1); + for (int i = 0; i < ARRAY_SIZE(fd); i++) + close(fd[i]); + break; + } + } + if (children == 2) { /* parent */ + sched_yield(); + break; + } + } + atomic_fetch_add(&control[1], -1); + } + + sleep(30); + + *control = 1; + igt_waitchildren(); + + while (READ_ONCE(control[1])) { + int status = 0; + wait(&status); + } + + igt_info("Spawned %d children\n", control[2]); + + close(dmabuf); + munmap(control, 4096); +} + static void test_isolation(int i915) { @@ -1097,6 +1165,8 @@ igt_main test_flink_race(fd); igt_subtest("pf-nonblock") test_pf_nonblock(fd); + igt_subtest("fork-bomb") + test_fork_bomb(fd); igt_subtest("basic-small-bo") test_huge_bo(fd, -1, I915_TILING_NONE); -- 2.24.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
