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Fri, 19 Sep 2025 06:06:49 -0700 (PDT) From: Yongting Lin To: anthony.yznaga@oracle.com, khalid@kernel.org, shuah@kernel.org Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, libo.gcs85@bytedance.com, Yongting Lin Subject: [PATCH V2 6/8] mshare: selftests: Add some helper functions for configuring and retrieving cgroup Date: Fri, 19 Sep 2025 21:06:18 +0800 Message-Id: <20250919130620.56518-6-linyongting@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250919130620.56518-1-linyongting@bytedance.com> References: <20250919130620.56518-1-linyongting@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 530212001B X-Stat-Signature: me6gyacu9mxpzrsfmr65yayc8jiehg1s X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1758287211-190714 X-HE-Meta: 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 yadU9RHY x37w1PPPksO5/o8ZlDvwRT93PNdygDyMaaWKdd8mGeLgkhB2/xdiIOyDWAHyCZNXPahPnhpjtBRS88K22zf6FYMQiIhlfC4Kf3P+uFXxPXyptN42LzCG73nicork/I5rq2RKKQh+1zRL4p58yg4EPydDjXSKLx0S2flFuNNnzS5ndbldUky3MeHJNTKNdSyhlaVro5aFax5/IfNWa9cDfYlynXqjPw0vxWZ6vn9mlT6q+0+X31lzqd/vgWLTWmVrmY5tm1ryYBB8GMaGX0v/eDhjzEG4OQ+Rua3LAffS4LqUJcm9oIrUzjH2UtuyESoLMRbD0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Before verify some complicated memory functionalities such as swap memory and THP, we need add some helper functions to configure and retrieve cgroups (specifically, memcg). These helper functions consist: Create and destroy individual cgroup for test cases attach and dettach the test process to specified cgroup Read swap size and thp size from testing cgroup Signed-off-by: Yongting Lin --- tools/testing/selftests/mshare/util.c | 128 ++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) diff --git a/tools/testing/selftests/mshare/util.c b/tools/testing/selftests/mshare/util.c index a3c3896bd507..f1db4eb3cd8f 100644 --- a/tools/testing/selftests/mshare/util.c +++ b/tools/testing/selftests/mshare/util.c @@ -124,3 +124,131 @@ int mshare_ioctl_munmap(int fd, size_t size) return ioctl(fd, MSHAREFS_UNMAP, &munmap); } + +/* + * Helper functions for cgroup + */ + +#define CGROUP_BASE "/sys/fs/cgroup/" +#define CGROUP_TEST "mshare-test-XXXXXX" + +bool is_cgroup_v2; + +__attribute__((constructor)) +void get_cgroup_version(void) +{ + if (access(CGROUP_BASE "cgroup.controllers", F_OK) == 0) + is_cgroup_v2 = true; +} + +int create_mshare_test_cgroup(char *cgroup, size_t len) +{ + if (is_cgroup_v2) + snprintf(cgroup, len, "%s/%s", CGROUP_BASE, CGROUP_TEST); + else + snprintf(cgroup, len, "%s/memory/%s", CGROUP_BASE, CGROUP_TEST); + + char *path = mkdtemp(cgroup); + + if (!path) { + perror("mkdtemp"); + return -1; + } + + return 0; +} + +int remove_cgroup(char *cgroup) +{ + return rmdir(cgroup); +} + +int write_data_to_cgroup(char *cgroup, char *file, char *data) +{ + char filename[128]; + int fd; + int ret; + + snprintf(filename, sizeof(filename), "%s/%s", cgroup, file); + fd = open(filename, O_RDWR); + + if (fd == -1) + return -1; + + ret = write(fd, data, strlen(data)); + close(fd); + + return ret; +} + +int attach_to_cgroup(char *cgroup) +{ + char pid_str[32]; + + snprintf(pid_str, sizeof(pid_str), "%d", getpid()); + return write_data_to_cgroup(cgroup, "cgroup.procs", pid_str); +} + +/* + * Simplely, just move the pid to root memcg as avoid + * complicated consideration. + */ +int dettach_from_cgroup(char *cgroup) +{ + char pid_str[32]; + char *root_memcg; + + if (is_cgroup_v2) + root_memcg = CGROUP_BASE; + else + root_memcg = CGROUP_BASE "memory"; + + snprintf(pid_str, sizeof(pid_str), "%d", getpid()); + return write_data_to_cgroup(root_memcg, "cgroup.procs", pid_str); +} + +size_t read_data_from_cgroup(char *cgroup, char *file, char *field) +{ + char filename[128]; + FILE *fp; + char line[80]; + size_t size = -1; + + snprintf(filename, sizeof(filename), "%s/%s", cgroup, file); + fp = fopen(filename, "r"); + if (!fp) { + perror("fopen"); + return -1; + } + + while (fgets(line, sizeof(line), fp)) { + if (!strncmp(line, field, strlen(field))) { + char *value = line + strlen(field) + 1; + + size = atol(value); + break; + } + } + + fclose(fp); + + return size; +} + +size_t read_swap_from_cgroup(char *cgroup) +{ + if (is_cgroup_v2) + return read_data_from_cgroup(cgroup, "memory.stat", "pswpout"); + else + return read_data_from_cgroup(cgroup, "memory.stat", "swap"); +} + +size_t read_huge_from_cgroup(char *cgroup) +{ + if (is_cgroup_v2) + return read_data_from_cgroup(cgroup, "memory.stat", "file_thp") + + read_data_from_cgroup(cgroup, "memory.stat", "anon_thp") + + read_data_from_cgroup(cgroup, "memory.stat", "shmem_thp"); + else + return read_data_from_cgroup(cgroup, "memory.stat", "rss_huge"); +} -- 2.20.1