Hi Thadeu,
On 2026-09-03 at 19:00:24 -0300, Thadeu Lima de Souza Cascardo wrote:
> 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(+)
>
> 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()
Can it be igt_main() with igt_fixture for require and a basic
subtest? It is not blocker, it could be converted later.
Regards,
Kamil
> +{
> + 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 1ac89bab7e15..c362d42888ba 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
>
