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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/cgroup/test_memcontrol.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/cgroup/test_memcontrol.c')
-rw-r--r-- | tools/testing/selftests/cgroup/test_memcontrol.c | 1228 |
1 files changed, 1228 insertions, 0 deletions
diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c new file mode 100644 index 000000000..c19a97dd0 --- /dev/null +++ b/tools/testing/selftests/cgroup/test_memcontrol.c @@ -0,0 +1,1228 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#define _GNU_SOURCE + +#include <linux/limits.h> +#include <linux/oom.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> +#include <sys/socket.h> +#include <sys/wait.h> +#include <arpa/inet.h> +#include <netinet/in.h> +#include <netdb.h> +#include <errno.h> + +#include "../kselftest.h" +#include "cgroup_util.h" + +/* + * This test creates two nested cgroups with and without enabling + * the memory controller. + */ +static int test_memcg_subtree_control(const char *root) +{ + char *parent, *child, *parent2 = NULL, *child2 = NULL; + int ret = KSFT_FAIL; + char buf[PAGE_SIZE]; + + /* Create two nested cgroups with the memory controller enabled */ + parent = cg_name(root, "memcg_test_0"); + child = cg_name(root, "memcg_test_0/memcg_test_1"); + if (!parent || !child) + goto cleanup_free; + + if (cg_create(parent)) + goto cleanup_free; + + if (cg_write(parent, "cgroup.subtree_control", "+memory")) + goto cleanup_parent; + + if (cg_create(child)) + goto cleanup_parent; + + if (cg_read_strstr(child, "cgroup.controllers", "memory")) + goto cleanup_child; + + /* Create two nested cgroups without enabling memory controller */ + parent2 = cg_name(root, "memcg_test_1"); + child2 = cg_name(root, "memcg_test_1/memcg_test_1"); + if (!parent2 || !child2) + goto cleanup_free2; + + if (cg_create(parent2)) + goto cleanup_free2; + + if (cg_create(child2)) + goto cleanup_parent2; + + if (cg_read(child2, "cgroup.controllers", buf, sizeof(buf))) + goto cleanup_all; + + if (!cg_read_strstr(child2, "cgroup.controllers", "memory")) + goto cleanup_all; + + ret = KSFT_PASS; + +cleanup_all: + cg_destroy(child2); +cleanup_parent2: + cg_destroy(parent2); +cleanup_free2: + free(parent2); + free(child2); +cleanup_child: + cg_destroy(child); +cleanup_parent: + cg_destroy(parent); +cleanup_free: + free(parent); + free(child); + + return ret; +} + +static int alloc_anon_50M_check(const char *cgroup, void *arg) +{ + size_t size = MB(50); + char *buf, *ptr; + long anon, current; + int ret = -1; + + buf = malloc(size); + for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + *ptr = 0; + + current = cg_read_long(cgroup, "memory.current"); + if (current < size) + goto cleanup; + + if (!values_close(size, current, 3)) + goto cleanup; + + anon = cg_read_key_long(cgroup, "memory.stat", "anon "); + if (anon < 0) + goto cleanup; + + if (!values_close(anon, current, 3)) + goto cleanup; + + ret = 0; +cleanup: + free(buf); + return ret; +} + +static int alloc_pagecache_50M_check(const char *cgroup, void *arg) +{ + size_t size = MB(50); + int ret = -1; + long current, file; + int fd; + + fd = get_temp_fd(); + if (fd < 0) + return -1; + + if (alloc_pagecache(fd, size)) + goto cleanup; + + current = cg_read_long(cgroup, "memory.current"); + if (current < size) + goto cleanup; + + file = cg_read_key_long(cgroup, "memory.stat", "file "); + if (file < 0) + goto cleanup; + + if (!values_close(file, current, 10)) + goto cleanup; + + ret = 0; + +cleanup: + close(fd); + return ret; +} + +/* + * This test create a memory cgroup, allocates + * some anonymous memory and some pagecache + * and check memory.current and some memory.stat values. + */ +static int test_memcg_current(const char *root) +{ + int ret = KSFT_FAIL; + long current; + char *memcg; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + current = cg_read_long(memcg, "memory.current"); + if (current != 0) + goto cleanup; + + if (cg_run(memcg, alloc_anon_50M_check, NULL)) + goto cleanup; + + if (cg_run(memcg, alloc_pagecache_50M_check, NULL)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +static int alloc_pagecache_50M(const char *cgroup, void *arg) +{ + int fd = (long)arg; + + return alloc_pagecache(fd, MB(50)); +} + +static int alloc_pagecache_50M_noexit(const char *cgroup, void *arg) +{ + int fd = (long)arg; + int ppid = getppid(); + + if (alloc_pagecache(fd, MB(50))) + return -1; + + while (getppid() == ppid) + sleep(1); + + return 0; +} + +static int alloc_anon_noexit(const char *cgroup, void *arg) +{ + int ppid = getppid(); + + if (alloc_anon(cgroup, arg)) + return -1; + + while (getppid() == ppid) + sleep(1); + + return 0; +} + +/* + * Wait until processes are killed asynchronously by the OOM killer + * If we exceed a timeout, fail. + */ +static int cg_test_proc_killed(const char *cgroup) +{ + int limit; + + for (limit = 10; limit > 0; limit--) { + if (cg_read_strcmp(cgroup, "cgroup.procs", "") == 0) + return 0; + + usleep(100000); + } + return -1; +} + +/* + * First, this test creates the following hierarchy: + * A memory.min = 50M, memory.max = 200M + * A/B memory.min = 50M, memory.current = 50M + * A/B/C memory.min = 75M, memory.current = 50M + * A/B/D memory.min = 25M, memory.current = 50M + * A/B/E memory.min = 500M, memory.current = 0 + * A/B/F memory.min = 0, memory.current = 50M + * + * Usages are pagecache, but the test keeps a running + * process in every leaf cgroup. + * Then it creates A/G and creates a significant + * memory pressure in it. + * + * A/B memory.current ~= 50M + * A/B/C memory.current ~= 33M + * A/B/D memory.current ~= 17M + * A/B/E memory.current ~= 0 + * + * After that it tries to allocate more than there is + * unprotected memory in A available, and checks + * checks that memory.min protects pagecache even + * in this case. + */ +static int test_memcg_min(const char *root) +{ + int ret = KSFT_FAIL; + char *parent[3] = {NULL}; + char *children[4] = {NULL}; + long c[4]; + int i, attempts; + int fd; + + fd = get_temp_fd(); + if (fd < 0) + goto cleanup; + + parent[0] = cg_name(root, "memcg_test_0"); + if (!parent[0]) + goto cleanup; + + parent[1] = cg_name(parent[0], "memcg_test_1"); + if (!parent[1]) + goto cleanup; + + parent[2] = cg_name(parent[0], "memcg_test_2"); + if (!parent[2]) + goto cleanup; + + if (cg_create(parent[0])) + goto cleanup; + + if (cg_read_long(parent[0], "memory.min")) { + ret = KSFT_SKIP; + goto cleanup; + } + + if (cg_write(parent[0], "cgroup.subtree_control", "+memory")) + goto cleanup; + + if (cg_write(parent[0], "memory.max", "200M")) + goto cleanup; + + if (cg_write(parent[0], "memory.swap.max", "0")) + goto cleanup; + + if (cg_create(parent[1])) + goto cleanup; + + if (cg_write(parent[1], "cgroup.subtree_control", "+memory")) + goto cleanup; + + if (cg_create(parent[2])) + goto cleanup; + + for (i = 0; i < ARRAY_SIZE(children); i++) { + children[i] = cg_name_indexed(parent[1], "child_memcg", i); + if (!children[i]) + goto cleanup; + + if (cg_create(children[i])) + goto cleanup; + + if (i == 2) + continue; + + cg_run_nowait(children[i], alloc_pagecache_50M_noexit, + (void *)(long)fd); + } + + if (cg_write(parent[0], "memory.min", "50M")) + goto cleanup; + if (cg_write(parent[1], "memory.min", "50M")) + goto cleanup; + if (cg_write(children[0], "memory.min", "75M")) + goto cleanup; + if (cg_write(children[1], "memory.min", "25M")) + goto cleanup; + if (cg_write(children[2], "memory.min", "500M")) + goto cleanup; + if (cg_write(children[3], "memory.min", "0")) + goto cleanup; + + attempts = 0; + while (!values_close(cg_read_long(parent[1], "memory.current"), + MB(150), 3)) { + if (attempts++ > 5) + break; + sleep(1); + } + + if (cg_run(parent[2], alloc_anon, (void *)MB(148))) + goto cleanup; + + if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3)) + goto cleanup; + + for (i = 0; i < ARRAY_SIZE(children); i++) + c[i] = cg_read_long(children[i], "memory.current"); + + if (!values_close(c[0], MB(33), 10)) + goto cleanup; + + if (!values_close(c[1], MB(17), 10)) + goto cleanup; + + if (!values_close(c[2], 0, 1)) + goto cleanup; + + if (!cg_run(parent[2], alloc_anon, (void *)MB(170))) + goto cleanup; + + if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + for (i = ARRAY_SIZE(children) - 1; i >= 0; i--) { + if (!children[i]) + continue; + + cg_destroy(children[i]); + free(children[i]); + } + + for (i = ARRAY_SIZE(parent) - 1; i >= 0; i--) { + if (!parent[i]) + continue; + + cg_destroy(parent[i]); + free(parent[i]); + } + close(fd); + return ret; +} + +/* + * First, this test creates the following hierarchy: + * A memory.low = 50M, memory.max = 200M + * A/B memory.low = 50M, memory.current = 50M + * A/B/C memory.low = 75M, memory.current = 50M + * A/B/D memory.low = 25M, memory.current = 50M + * A/B/E memory.low = 500M, memory.current = 0 + * A/B/F memory.low = 0, memory.current = 50M + * + * Usages are pagecache. + * Then it creates A/G an creates a significant + * memory pressure in it. + * + * Then it checks actual memory usages and expects that: + * A/B memory.current ~= 50M + * A/B/ memory.current ~= 33M + * A/B/D memory.current ~= 17M + * A/B/E memory.current ~= 0 + * + * After that it tries to allocate more than there is + * unprotected memory in A available, + * and checks low and oom events in memory.events. + */ +static int test_memcg_low(const char *root) +{ + int ret = KSFT_FAIL; + char *parent[3] = {NULL}; + char *children[4] = {NULL}; + long low, oom; + long c[4]; + int i; + int fd; + + fd = get_temp_fd(); + if (fd < 0) + goto cleanup; + + parent[0] = cg_name(root, "memcg_test_0"); + if (!parent[0]) + goto cleanup; + + parent[1] = cg_name(parent[0], "memcg_test_1"); + if (!parent[1]) + goto cleanup; + + parent[2] = cg_name(parent[0], "memcg_test_2"); + if (!parent[2]) + goto cleanup; + + if (cg_create(parent[0])) + goto cleanup; + + if (cg_read_long(parent[0], "memory.low")) + goto cleanup; + + if (cg_write(parent[0], "cgroup.subtree_control", "+memory")) + goto cleanup; + + if (cg_write(parent[0], "memory.max", "200M")) + goto cleanup; + + if (cg_write(parent[0], "memory.swap.max", "0")) + goto cleanup; + + if (cg_create(parent[1])) + goto cleanup; + + if (cg_write(parent[1], "cgroup.subtree_control", "+memory")) + goto cleanup; + + if (cg_create(parent[2])) + goto cleanup; + + for (i = 0; i < ARRAY_SIZE(children); i++) { + children[i] = cg_name_indexed(parent[1], "child_memcg", i); + if (!children[i]) + goto cleanup; + + if (cg_create(children[i])) + goto cleanup; + + if (i == 2) + continue; + + if (cg_run(children[i], alloc_pagecache_50M, (void *)(long)fd)) + goto cleanup; + } + + if (cg_write(parent[0], "memory.low", "50M")) + goto cleanup; + if (cg_write(parent[1], "memory.low", "50M")) + goto cleanup; + if (cg_write(children[0], "memory.low", "75M")) + goto cleanup; + if (cg_write(children[1], "memory.low", "25M")) + goto cleanup; + if (cg_write(children[2], "memory.low", "500M")) + goto cleanup; + if (cg_write(children[3], "memory.low", "0")) + goto cleanup; + + if (cg_run(parent[2], alloc_anon, (void *)MB(148))) + goto cleanup; + + if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3)) + goto cleanup; + + for (i = 0; i < ARRAY_SIZE(children); i++) + c[i] = cg_read_long(children[i], "memory.current"); + + if (!values_close(c[0], MB(33), 10)) + goto cleanup; + + if (!values_close(c[1], MB(17), 10)) + goto cleanup; + + if (!values_close(c[2], 0, 1)) + goto cleanup; + + if (cg_run(parent[2], alloc_anon, (void *)MB(166))) { + fprintf(stderr, + "memory.low prevents from allocating anon memory\n"); + goto cleanup; + } + + for (i = 0; i < ARRAY_SIZE(children); i++) { + oom = cg_read_key_long(children[i], "memory.events", "oom "); + low = cg_read_key_long(children[i], "memory.events", "low "); + + if (oom) + goto cleanup; + if (i < 2 && low <= 0) + goto cleanup; + if (i >= 2 && low) + goto cleanup; + } + + ret = KSFT_PASS; + +cleanup: + for (i = ARRAY_SIZE(children) - 1; i >= 0; i--) { + if (!children[i]) + continue; + + cg_destroy(children[i]); + free(children[i]); + } + + for (i = ARRAY_SIZE(parent) - 1; i >= 0; i--) { + if (!parent[i]) + continue; + + cg_destroy(parent[i]); + free(parent[i]); + } + close(fd); + return ret; +} + +static int alloc_pagecache_max_30M(const char *cgroup, void *arg) +{ + size_t size = MB(50); + int ret = -1; + long current; + int fd; + + fd = get_temp_fd(); + if (fd < 0) + return -1; + + if (alloc_pagecache(fd, size)) + goto cleanup; + + current = cg_read_long(cgroup, "memory.current"); + if (current <= MB(29) || current > MB(30)) + goto cleanup; + + ret = 0; + +cleanup: + close(fd); + return ret; + +} + +/* + * This test checks that memory.high limits the amount of + * memory which can be consumed by either anonymous memory + * or pagecache. + */ +static int test_memcg_high(const char *root) +{ + int ret = KSFT_FAIL; + char *memcg; + long high; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + if (cg_read_strcmp(memcg, "memory.high", "max\n")) + goto cleanup; + + if (cg_write(memcg, "memory.swap.max", "0")) + goto cleanup; + + if (cg_write(memcg, "memory.high", "30M")) + goto cleanup; + + if (cg_run(memcg, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (!cg_run(memcg, alloc_pagecache_50M_check, NULL)) + goto cleanup; + + if (cg_run(memcg, alloc_pagecache_max_30M, NULL)) + goto cleanup; + + high = cg_read_key_long(memcg, "memory.events", "high "); + if (high <= 0) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +/* + * This test checks that memory.max limits the amount of + * memory which can be consumed by either anonymous memory + * or pagecache. + */ +static int test_memcg_max(const char *root) +{ + int ret = KSFT_FAIL; + char *memcg; + long current, max; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + if (cg_read_strcmp(memcg, "memory.max", "max\n")) + goto cleanup; + + if (cg_write(memcg, "memory.swap.max", "0")) + goto cleanup; + + if (cg_write(memcg, "memory.max", "30M")) + goto cleanup; + + /* Should be killed by OOM killer */ + if (!cg_run(memcg, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_run(memcg, alloc_pagecache_max_30M, NULL)) + goto cleanup; + + current = cg_read_long(memcg, "memory.current"); + if (current > MB(30) || !current) + goto cleanup; + + max = cg_read_key_long(memcg, "memory.events", "max "); + if (max <= 0) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +static int alloc_anon_50M_check_swap(const char *cgroup, void *arg) +{ + long mem_max = (long)arg; + size_t size = MB(50); + char *buf, *ptr; + long mem_current, swap_current; + int ret = -1; + + buf = malloc(size); + for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + *ptr = 0; + + mem_current = cg_read_long(cgroup, "memory.current"); + if (!mem_current || !values_close(mem_current, mem_max, 3)) + goto cleanup; + + swap_current = cg_read_long(cgroup, "memory.swap.current"); + if (!swap_current || + !values_close(mem_current + swap_current, size, 3)) + goto cleanup; + + ret = 0; +cleanup: + free(buf); + return ret; +} + +/* + * This test checks that memory.swap.max limits the amount of + * anonymous memory which can be swapped out. + */ +static int test_memcg_swap_max(const char *root) +{ + int ret = KSFT_FAIL; + char *memcg; + long max; + + if (!is_swap_enabled()) + return KSFT_SKIP; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + if (cg_read_long(memcg, "memory.swap.current")) { + ret = KSFT_SKIP; + goto cleanup; + } + + if (cg_read_strcmp(memcg, "memory.max", "max\n")) + goto cleanup; + + if (cg_read_strcmp(memcg, "memory.swap.max", "max\n")) + goto cleanup; + + if (cg_write(memcg, "memory.swap.max", "30M")) + goto cleanup; + + if (cg_write(memcg, "memory.max", "30M")) + goto cleanup; + + /* Should be killed by OOM killer */ + if (!cg_run(memcg, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.events", "oom ") != 1) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 1) + goto cleanup; + + if (cg_run(memcg, alloc_anon_50M_check_swap, (void *)MB(30))) + goto cleanup; + + max = cg_read_key_long(memcg, "memory.events", "max "); + if (max <= 0) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +/* + * This test disables swapping and tries to allocate anonymous memory + * up to OOM. Then it checks for oom and oom_kill events in + * memory.events. + */ +static int test_memcg_oom_events(const char *root) +{ + int ret = KSFT_FAIL; + char *memcg; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + if (cg_write(memcg, "memory.max", "30M")) + goto cleanup; + + if (cg_write(memcg, "memory.swap.max", "0")) + goto cleanup; + + if (!cg_run(memcg, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_read_strcmp(memcg, "cgroup.procs", "")) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.events", "oom ") != 1) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 1) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +struct tcp_server_args { + unsigned short port; + int ctl[2]; +}; + +static int tcp_server(const char *cgroup, void *arg) +{ + struct tcp_server_args *srv_args = arg; + struct sockaddr_in6 saddr = { 0 }; + socklen_t slen = sizeof(saddr); + int sk, client_sk, ctl_fd, yes = 1, ret = -1; + + close(srv_args->ctl[0]); + ctl_fd = srv_args->ctl[1]; + + saddr.sin6_family = AF_INET6; + saddr.sin6_addr = in6addr_any; + saddr.sin6_port = htons(srv_args->port); + + sk = socket(AF_INET6, SOCK_STREAM, 0); + if (sk < 0) + return ret; + + if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) + goto cleanup; + + if (bind(sk, (struct sockaddr *)&saddr, slen)) { + write(ctl_fd, &errno, sizeof(errno)); + goto cleanup; + } + + if (listen(sk, 1)) + goto cleanup; + + ret = 0; + if (write(ctl_fd, &ret, sizeof(ret)) != sizeof(ret)) { + ret = -1; + goto cleanup; + } + + client_sk = accept(sk, NULL, NULL); + if (client_sk < 0) + goto cleanup; + + ret = -1; + for (;;) { + uint8_t buf[0x100000]; + + if (write(client_sk, buf, sizeof(buf)) <= 0) { + if (errno == ECONNRESET) + ret = 0; + break; + } + } + + close(client_sk); + +cleanup: + close(sk); + return ret; +} + +static int tcp_client(const char *cgroup, unsigned short port) +{ + const char server[] = "localhost"; + struct addrinfo *ai; + char servport[6]; + int retries = 0x10; /* nice round number */ + int sk, ret; + + snprintf(servport, sizeof(servport), "%hd", port); + ret = getaddrinfo(server, servport, NULL, &ai); + if (ret) + return ret; + + sk = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); + if (sk < 0) + goto free_ainfo; + + ret = connect(sk, ai->ai_addr, ai->ai_addrlen); + if (ret < 0) + goto close_sk; + + ret = KSFT_FAIL; + while (retries--) { + uint8_t buf[0x100000]; + long current, sock; + + if (read(sk, buf, sizeof(buf)) <= 0) + goto close_sk; + + current = cg_read_long(cgroup, "memory.current"); + sock = cg_read_key_long(cgroup, "memory.stat", "sock "); + + if (current < 0 || sock < 0) + goto close_sk; + + if (current < sock) + goto close_sk; + + if (values_close(current, sock, 10)) { + ret = KSFT_PASS; + break; + } + } + +close_sk: + close(sk); +free_ainfo: + freeaddrinfo(ai); + return ret; +} + +/* + * This test checks socket memory accounting. + * The test forks a TCP server listens on a random port between 1000 + * and 61000. Once it gets a client connection, it starts writing to + * its socket. + * The TCP client interleaves reads from the socket with check whether + * memory.current and memory.stat.sock are similar. + */ +static int test_memcg_sock(const char *root) +{ + int bind_retries = 5, ret = KSFT_FAIL, pid, err; + unsigned short port; + char *memcg; + + memcg = cg_name(root, "memcg_test"); + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + while (bind_retries--) { + struct tcp_server_args args; + + if (pipe(args.ctl)) + goto cleanup; + + port = args.port = 1000 + rand() % 60000; + + pid = cg_run_nowait(memcg, tcp_server, &args); + if (pid < 0) + goto cleanup; + + close(args.ctl[1]); + if (read(args.ctl[0], &err, sizeof(err)) != sizeof(err)) + goto cleanup; + close(args.ctl[0]); + + if (!err) + break; + if (err != EADDRINUSE) + goto cleanup; + + waitpid(pid, NULL, 0); + } + + if (err == EADDRINUSE) { + ret = KSFT_SKIP; + goto cleanup; + } + + if (tcp_client(memcg, port) != KSFT_PASS) + goto cleanup; + + waitpid(pid, &err, 0); + if (WEXITSTATUS(err)) + goto cleanup; + + if (cg_read_long(memcg, "memory.current") < 0) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.stat", "sock ")) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + cg_destroy(memcg); + free(memcg); + + return ret; +} + +/* + * This test disables swapping and tries to allocate anonymous memory + * up to OOM with memory.group.oom set. Then it checks that all + * processes in the leaf (but not the parent) were killed. + */ +static int test_memcg_oom_group_leaf_events(const char *root) +{ + int ret = KSFT_FAIL; + char *parent, *child; + + parent = cg_name(root, "memcg_test_0"); + child = cg_name(root, "memcg_test_0/memcg_test_1"); + + if (!parent || !child) + goto cleanup; + + if (cg_create(parent)) + goto cleanup; + + if (cg_create(child)) + goto cleanup; + + if (cg_write(parent, "cgroup.subtree_control", "+memory")) + goto cleanup; + + if (cg_write(child, "memory.max", "50M")) + goto cleanup; + + if (cg_write(child, "memory.swap.max", "0")) + goto cleanup; + + if (cg_write(child, "memory.oom.group", "1")) + goto cleanup; + + cg_run_nowait(parent, alloc_anon_noexit, (void *) MB(60)); + cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1)); + cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1)); + if (!cg_run(child, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_test_proc_killed(child)) + goto cleanup; + + if (cg_read_key_long(child, "memory.events", "oom_kill ") <= 0) + goto cleanup; + + if (cg_read_key_long(parent, "memory.events", "oom_kill ") != 0) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + if (child) + cg_destroy(child); + if (parent) + cg_destroy(parent); + free(child); + free(parent); + + return ret; +} + +/* + * This test disables swapping and tries to allocate anonymous memory + * up to OOM with memory.group.oom set. Then it checks that all + * processes in the parent and leaf were killed. + */ +static int test_memcg_oom_group_parent_events(const char *root) +{ + int ret = KSFT_FAIL; + char *parent, *child; + + parent = cg_name(root, "memcg_test_0"); + child = cg_name(root, "memcg_test_0/memcg_test_1"); + + if (!parent || !child) + goto cleanup; + + if (cg_create(parent)) + goto cleanup; + + if (cg_create(child)) + goto cleanup; + + if (cg_write(parent, "memory.max", "80M")) + goto cleanup; + + if (cg_write(parent, "memory.swap.max", "0")) + goto cleanup; + + if (cg_write(parent, "memory.oom.group", "1")) + goto cleanup; + + cg_run_nowait(parent, alloc_anon_noexit, (void *) MB(60)); + cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1)); + cg_run_nowait(child, alloc_anon_noexit, (void *) MB(1)); + + if (!cg_run(child, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_test_proc_killed(child)) + goto cleanup; + if (cg_test_proc_killed(parent)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + if (child) + cg_destroy(child); + if (parent) + cg_destroy(parent); + free(child); + free(parent); + + return ret; +} + +/* + * This test disables swapping and tries to allocate anonymous memory + * up to OOM with memory.group.oom set. Then it checks that all + * processes were killed except those set with OOM_SCORE_ADJ_MIN + */ +static int test_memcg_oom_group_score_events(const char *root) +{ + int ret = KSFT_FAIL; + char *memcg; + int safe_pid; + + memcg = cg_name(root, "memcg_test_0"); + + if (!memcg) + goto cleanup; + + if (cg_create(memcg)) + goto cleanup; + + if (cg_write(memcg, "memory.max", "50M")) + goto cleanup; + + if (cg_write(memcg, "memory.swap.max", "0")) + goto cleanup; + + if (cg_write(memcg, "memory.oom.group", "1")) + goto cleanup; + + safe_pid = cg_run_nowait(memcg, alloc_anon_noexit, (void *) MB(1)); + if (set_oom_adj_score(safe_pid, OOM_SCORE_ADJ_MIN)) + goto cleanup; + + cg_run_nowait(memcg, alloc_anon_noexit, (void *) MB(1)); + if (!cg_run(memcg, alloc_anon, (void *)MB(100))) + goto cleanup; + + if (cg_read_key_long(memcg, "memory.events", "oom_kill ") != 3) + goto cleanup; + + if (kill(safe_pid, SIGKILL)) + goto cleanup; + + ret = KSFT_PASS; + +cleanup: + if (memcg) + cg_destroy(memcg); + free(memcg); + + return ret; +} + + +#define T(x) { x, #x } +struct memcg_test { + int (*fn)(const char *root); + const char *name; +} tests[] = { + T(test_memcg_subtree_control), + T(test_memcg_current), + T(test_memcg_min), + T(test_memcg_low), + T(test_memcg_high), + T(test_memcg_max), + T(test_memcg_oom_events), + T(test_memcg_swap_max), + T(test_memcg_sock), + T(test_memcg_oom_group_leaf_events), + T(test_memcg_oom_group_parent_events), + T(test_memcg_oom_group_score_events), +}; +#undef T + +int main(int argc, char **argv) +{ + char root[PATH_MAX]; + int i, ret = EXIT_SUCCESS; + + if (cg_find_unified_root(root, sizeof(root))) + ksft_exit_skip("cgroup v2 isn't mounted\n"); + + /* + * Check that memory controller is available: + * memory is listed in cgroup.controllers + */ + if (cg_read_strstr(root, "cgroup.controllers", "memory")) + ksft_exit_skip("memory controller isn't available\n"); + + if (cg_read_strstr(root, "cgroup.subtree_control", "memory")) + if (cg_write(root, "cgroup.subtree_control", "+memory")) + ksft_exit_skip("Failed to set memory controller\n"); + + for (i = 0; i < ARRAY_SIZE(tests); i++) { + switch (tests[i].fn(root)) { + case KSFT_PASS: + ksft_test_result_pass("%s\n", tests[i].name); + break; + case KSFT_SKIP: + ksft_test_result_skip("%s\n", tests[i].name); + break; + default: + ret = EXIT_FAILURE; + ksft_test_result_fail("%s\n", tests[i].name); + break; + } + } + + return ret; +} |