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cdc69458a5
The test_memcg_low() testcase in test_memcontrol.c verifies the expected
behavior of groups using the memory.low knob. Part of the testcase
verifies that a group with memory.low that experiences reclaim due to
memory pressure elsewhere in the system, observes memory.events.low events
as a result of that reclaim.
In commit 8a931f8013 ("mm: memcontrol: recursive memory.low
protection"), the memory controller was updated to propagate memory.low
and memory.min protection from a parent group to its children via a
configurable memory_recursiveprot mount option. This unfortunately broke
the memcg tests, which asserts that a sibling that experienced reclaim but
had a memory.low value of 0, would not observe any memory.low events.
This patch updates test_memcg_low() to account for the new behavior
introduced by memory_recursiveprot.
So as to make the test resilient to multiple configurations, the patch
also adds a new proc_mount_contains() helper that checks for a string in
/proc/mounts, and is used to toggle behavior based on whether the default
memory_recursiveprot was present.
Link: https://lkml.kernel.org/r/20220423155619.3669555-3-void@manifault.com
Signed-off-by: David Vernet <void@manifault.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
61 lines
2.4 KiB
C
61 lines
2.4 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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#include "../kselftest.h"
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#define PAGE_SIZE 4096
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#define MB(x) (x << 20)
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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 abs(a - b) <= (a + b) / 100 * err;
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}
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extern int cg_find_unified_root(char *root, size_t len);
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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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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_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 get_temp_fd(void);
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extern int alloc_pagecache(int fd, size_t size);
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extern int alloc_anon(const char *cgroup, void *arg);
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extern int is_swap_enabled(void);
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extern int set_oom_adj_score(int pid, int score);
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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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