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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-03-01 18:22:16 -05:00
38e1dd5781
Add an API in the cgroups library to find the root of a specific controller. KVM selftests will use the API to find the memory controller. Search for the controller on both v1 and v2 mounts, as KVM selftests' usage will be completely oblivious of v1 versus v2. Signed-off-by: James Houghton <jthoughton@google.com> Link: https://lore.kernel.org/r/20250508184649.2576210-6-jthoughton@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
68 lines
2.8 KiB
C
68 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdbool.h>
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#include <stdlib.h>
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#ifndef PAGE_SIZE
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#define PAGE_SIZE 4096
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#endif
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#define MB(x) (x << 20)
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#define USEC_PER_SEC 1000000L
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#define NSEC_PER_SEC 1000000000L
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#define TEST_UID 65534 /* usually nobody, any !root is fine */
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/*
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* Checks if two given values differ by less than err% of their sum.
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*/
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static inline int values_close(long a, long b, int err)
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{
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return labs(a - b) <= (a + b) / 100 * err;
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}
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extern ssize_t read_text(const char *path, char *buf, size_t max_len);
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extern ssize_t write_text(const char *path, char *buf, ssize_t len);
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extern int cg_find_controller_root(char *root, size_t len, const char *controller);
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extern int cg_find_unified_root(char *root, size_t len, bool *nsdelegate);
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extern char *cg_name(const char *root, const char *name);
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extern char *cg_name_indexed(const char *root, const char *name, int index);
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extern char *cg_control(const char *cgroup, const char *control);
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extern int cg_create(const char *cgroup);
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extern int cg_destroy(const char *cgroup);
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extern int cg_read(const char *cgroup, const char *control,
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char *buf, size_t len);
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extern int cg_read_strcmp(const char *cgroup, const char *control,
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const char *expected);
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extern int cg_read_strstr(const char *cgroup, const char *control,
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const char *needle);
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extern long cg_read_long(const char *cgroup, const char *control);
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extern long cg_read_long_fd(int fd);
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long cg_read_key_long(const char *cgroup, const char *control, const char *key);
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extern long cg_read_lc(const char *cgroup, const char *control);
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extern int cg_write(const char *cgroup, const char *control, char *buf);
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extern int cg_open(const char *cgroup, const char *control, int flags);
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int cg_write_numeric(const char *cgroup, const char *control, long value);
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extern int cg_run(const char *cgroup,
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int (*fn)(const char *cgroup, void *arg),
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void *arg);
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extern int cg_enter(const char *cgroup, int pid);
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extern int cg_enter_current(const char *cgroup);
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extern int cg_enter_current_thread(const char *cgroup);
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extern int cg_run_nowait(const char *cgroup,
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int (*fn)(const char *cgroup, void *arg),
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void *arg);
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extern int cg_wait_for_proc_count(const char *cgroup, int count);
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extern int cg_killall(const char *cgroup);
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int proc_mount_contains(const char *option);
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extern ssize_t proc_read_text(int pid, bool thread, const char *item, char *buf, size_t size);
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extern int proc_read_strstr(int pid, bool thread, const char *item, const char *needle);
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extern pid_t clone_into_cgroup(int cgroup_fd);
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extern int clone_reap(pid_t pid, int options);
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extern int clone_into_cgroup_run_wait(const char *cgroup);
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extern int dirfd_open_opath(const char *dir);
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extern int cg_prepare_for_wait(const char *cgroup);
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extern int memcg_prepare_for_wait(const char *cgroup);
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extern int cg_wait_for(int fd);
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