From: Thomas Hellström <[email protected]> Add a test that exercises the cgroup v2 dmem controller interface using the new igt_cgroup library.
The test uses igt_simple_main and: - Skips if no dmem regions are registered (no cgroup v2 or no dmem-capable device). - Creates a sub-cgroup and moves the test process into it. - Enumerates all registered device memory regions and prints their capacity, system-wide current usage, per-cgroup current usage, and configured min, low and max limits. - Destroys the cgroup on completion. Assisted-by: GitHub Copilot:claude-sonnet-4.6 Signed-off-by: Thomas Hellström <[email protected]> --- tests/cgroup_dmem.c | 92 +++++++++++++++++++++++++++++++++++++++++++++ tests/meson.build | 1 + 2 files changed, 93 insertions(+) create mode 100644 tests/cgroup_dmem.c diff --git a/tests/cgroup_dmem.c b/tests/cgroup_dmem.c new file mode 100644 index 000000000000..442c965f9bbf --- /dev/null +++ b/tests/cgroup_dmem.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2025 Intel Corporation + */ + +/** + * TEST: cgroup dmem + * Description: Exercises the cgroup v2 dmem controller interface. Creates a + * cgroup, moves the process into it, enumerates all dmem regions, + * prints their capacity, system-wide current usage, per-cgroup + * current usage and configured limits, then destroys the cgroup. + * Category: Core + * Mega feature: General Core features + * Sub-category: uapi + * Functionality: cgroup + * Feature: dmem + * Test category: uapi + */ + +#include <inttypes.h> + +#include "igt.h" +#include "igt_cgroup.h" + +IGT_TEST_DESCRIPTION("Exercises the cgroup v2 dmem controller interface."); + +static void fmt_bytes(uint64_t v, char *buf, size_t len) +{ + if (v == IGT_CGROUP_DMEM_MAX) + snprintf(buf, len, "max"); + else + snprintf(buf, len, "%" PRIu64, v); +} + +int igt_simple_main() +{ + struct igt_cgroup *cg; + const char *region; + char **regions; + uint64_t capacity, sys_current, cg_current, min, low, max; + char cap_s[32], sys_s[32], cg_s[32]; + char min_s[32], low_s[32], max_s[32]; + int i; + + igt_require_f(igt_cgroup_dmem_available(), + "No dmem regions found; is cgroup v2 with the " + "dmem controller available?\n"); + + cg = igt_cgroup_new("igt-cgroup-dmem-test"); + igt_assert_f(cg, "Failed to create cgroup\n"); + + igt_cgroup_move_current(cg); + + regions = igt_cgroup_dmem_regions(); + igt_assert_f(regions, "Failed to enumerate dmem regions\n"); + + igt_info("%-40s %16s %16s %16s %16s %16s %16s\n", + "region", "capacity", "system-current", + "cgroup-current", "min", "low", "max"); + igt_info("%-40s %16s %16s %16s %16s %16s %16s\n", + "------", "--------", "--------------", + "--------------", "---", "---", "---"); + + for (i = 0; regions[i]; i++) { + region = regions[i]; + + igt_cgroup_dmem_get_capacity(region, &capacity); + fmt_bytes(capacity, cap_s, sizeof(cap_s)); + + igt_cgroup_dmem_get_system_current(region, &sys_current); + fmt_bytes(sys_current, sys_s, sizeof(sys_s)); + + igt_cgroup_dmem_get_current(cg, region, &cg_current); + fmt_bytes(cg_current, cg_s, sizeof(cg_s)); + + igt_cgroup_dmem_get_min(cg, region, &min); + fmt_bytes(min, min_s, sizeof(min_s)); + + igt_cgroup_dmem_get_low(cg, region, &low); + fmt_bytes(low, low_s, sizeof(low_s)); + + igt_cgroup_dmem_get_max(cg, region, &max); + fmt_bytes(max, max_s, sizeof(max_s)); + + igt_info("%-40s %16s %16s %16s %16s %16s %16s\n", + region, cap_s, sys_s, cg_s, + min_s, low_s, max_s); + } + + igt_cgroup_dmem_regions_free(regions); + igt_cgroup_free(cg); +} diff --git a/tests/meson.build b/tests/meson.build index 1beddb457f64..9552a175f825 100644 --- a/tests/meson.build +++ b/tests/meson.build @@ -1,4 +1,5 @@ test_progs = [ + 'cgroup_dmem', 'core_auth', 'core_debugfs', 'core_getclient', -- 2.47.3
