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SubjectRe: [PATCH 2/2] Add tests for memory.oom.group
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Hi Jay,

Thanks for the patch. Comments below:

On 09/04/2018 07:08 PM, jgkamat@fb.com wrote:
> From: Jay Kamat <jgkamat@fb.com>
>
> Add tests for memory.oom.group for the following cases:
> - Killing all processes in a leaf cgroup, but leaving the
> parent untouched
> - Killing all processes in a parent and leaf cgroup
> - Keeping processes marked by OOM_SCORE_ADJ_MIN alive when considered
> for being killed by the group oom killer.
>
> Signed-off-by: Jay Kamat <jgkamat@fb.com>
> ---
> tools/testing/selftests/cgroup/cgroup_util.c | 21 ++
> tools/testing/selftests/cgroup/cgroup_util.h | 1 +
> .../selftests/cgroup/test_memcontrol.c | 205 ++++++++++++++++++
> 3 files changed, 227 insertions(+)
>
> diff --git a/tools/testing/selftests/cgroup/cgroup_util.c b/tools/testing/selftests/cgroup/cgroup_util.c
> index 4aadf38bcd5d..6799c69d7f03 100644
> --- a/tools/testing/selftests/cgroup/cgroup_util.c
> +++ b/tools/testing/selftests/cgroup/cgroup_util.c
> @@ -338,3 +338,24 @@ int is_swap_enabled(void)
>
> return cnt > 1;
> }
> +
> +int set_oom_adj_score(int pid, int score)
> +{
> + char path[PATH_MAX];
> + int fd, len;
> +
> + sprintf(path, "/proc/%d/oom_score_adj", pid);
> +
> + fd = open(path, O_WRONLY | O_APPEND);
> + if (fd < 0)
> + return fd;
> +
> + len = dprintf(fd, "%d", score);
> + if (len < 0) {
> + close(fd);
> + return len;
> + }
> +
> + close(fd);
> + return 0;
> +}
> diff --git a/tools/testing/selftests/cgroup/cgroup_util.h b/tools/testing/selftests/cgroup/cgroup_util.h
> index fe82a297d4e0..cabd43fd137a 100644
> --- a/tools/testing/selftests/cgroup/cgroup_util.h
> +++ b/tools/testing/selftests/cgroup/cgroup_util.h
> @@ -39,3 +39,4 @@ extern int get_temp_fd(void);
> extern int alloc_pagecache(int fd, size_t size);
> extern int alloc_anon(const char *cgroup, void *arg);
> extern int is_swap_enabled(void);
> +extern int set_oom_adj_score(int pid, int score);
> diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
> index cf0bddc9d271..017c15a7a935 100644
> --- a/tools/testing/selftests/cgroup/test_memcontrol.c
> +++ b/tools/testing/selftests/cgroup/test_memcontrol.c
> @@ -2,6 +2,7 @@
> #define _GNU_SOURCE
>
> #include <linux/limits.h>
> +#include <linux/oom.h>
> #include <fcntl.h>
> #include <stdio.h>
> #include <stdlib.h>
> @@ -202,6 +203,36 @@ static int alloc_pagecache_50M_noexit(const char *cgroup, void *arg)
> 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
> @@ -964,6 +995,177 @@ static int test_memcg_sock(const char *root)
> 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))
> + return -1;

Missing cleanup? Should the return be just ret which is KSFT_FAIL
> +
> + 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);
> @@ -978,6 +1180,9 @@ struct memcg_test {
> 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
>
>

thanks,
-- Shuah

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