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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
#include <test_progs.h>
#include <bpf/libbpf.h>
#include <bpf/btf.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include "cgroup_helpers.h"
#include "cgroup_iter_memcg.h"
#include "cgroup_iter_memcg.skel.h"
static int read_stats(struct bpf_link *link)
{
int fd, ret = 0;
ssize_t bytes;
fd = bpf_iter_create(bpf_link__fd(link));
if (!ASSERT_OK_FD(fd, "bpf_iter_create"))
return 1;
/*
* Invoke iter program by reading from its fd. We're not expecting any
* data to be written by the bpf program so the result should be zero.
* Results will be read directly through the custom data section
* accessible through skel->data_query.memcg_query.
*/
bytes = read(fd, NULL, 0);
if (!ASSERT_EQ(bytes, 0, "read fd"))
ret = 1;
close(fd);
return ret;
}
static void test_anon(struct bpf_link *link, struct memcg_query *memcg_query)
{
void *map;
size_t len;
len = sysconf(_SC_PAGESIZE) * 1024;
/*
* Increase memcg anon usage by mapping and writing
* to a new anon region.
*/
map = mmap(NULL, len, PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (!ASSERT_NEQ(map, MAP_FAILED, "mmap anon"))
return;
memset(map, 1, len);
if (!ASSERT_OK(read_stats(link), "read stats"))
goto cleanup;
ASSERT_GT(memcg_query->nr_anon_mapped, 0, "final anon mapped val");
cleanup:
munmap(map, len);
}
static void test_file(struct bpf_link *link, struct memcg_query *memcg_query)
{
void *map;
size_t len;
char *path;
int fd;
len = sysconf(_SC_PAGESIZE) * 1024;
path = "/tmp/test_cgroup_iter_memcg";
/*
* Increase memcg file usage by creating and writing
* to a mapped file.
*/
fd = open(path, O_CREAT | O_RDWR, 0644);
if (!ASSERT_OK_FD(fd, "open fd"))
return;
if (!ASSERT_OK(ftruncate(fd, len), "ftruncate"))
goto cleanup_fd;
map = mmap(NULL, len, PROT_WRITE, MAP_SHARED, fd, 0);
if (!ASSERT_NEQ(map, MAP_FAILED, "mmap file"))
goto cleanup_fd;
memset(map, 1, len);
if (!ASSERT_OK(read_stats(link), "read stats"))
goto cleanup_map;
ASSERT_GT(memcg_query->nr_file_pages, 0, "final file value");
ASSERT_GT(memcg_query->nr_file_mapped, 0, "final file mapped value");
cleanup_map:
munmap(map, len);
cleanup_fd:
close(fd);
unlink(path);
}
static void test_shmem(struct bpf_link *link, struct memcg_query *memcg_query)
{
size_t len;
int fd;
len = sysconf(_SC_PAGESIZE) * 1024;
/*
* Increase memcg shmem usage by creating and writing
* to a shmem object.
*/
fd = shm_open("/tmp_shmem", O_CREAT | O_RDWR, 0644);
if (!ASSERT_OK_FD(fd, "shm_open"))
return;
if (!ASSERT_OK(fallocate(fd, 0, 0, len), "fallocate"))
goto cleanup;
if (!ASSERT_OK(read_stats(link), "read stats"))
goto cleanup;
ASSERT_GT(memcg_query->nr_shmem, 0, "final shmem value");
cleanup:
close(fd);
shm_unlink("/tmp_shmem");
}
#define NR_PIPES 64
static void test_kmem(struct bpf_link *link, struct memcg_query *memcg_query)
{
int fds[NR_PIPES][2], i;
/*
* Increase kmem value by creating pipes which will allocate some
* kernel buffers.
*/
for (i = 0; i < NR_PIPES; i++) {
if (!ASSERT_OK(pipe(fds[i]), "pipe"))
goto cleanup;
}
if (!ASSERT_OK(read_stats(link), "read stats"))
goto cleanup;
ASSERT_GT(memcg_query->memcg_kmem, 0, "kmem value");
cleanup:
for (i = i - 1; i >= 0; i--) {
close(fds[i][0]);
close(fds[i][1]);
}
}
static void test_pgfault(struct bpf_link *link, struct memcg_query *memcg_query)
{
void *map;
size_t len;
len = sysconf(_SC_PAGESIZE) * 1024;
/* Create region to use for triggering a page fault. */
map = mmap(NULL, len, PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (!ASSERT_NEQ(map, MAP_FAILED, "mmap anon"))
return;
/* Trigger page fault. */
memset(map, 1, len);
if (!ASSERT_OK(read_stats(link), "read stats"))
goto cleanup;
ASSERT_GT(memcg_query->pgfault, 0, "final pgfault val");
cleanup:
munmap(map, len);
}
void test_cgroup_iter_memcg(void)
{
char *cgroup_rel_path = "/cgroup_iter_memcg_test";
struct cgroup_iter_memcg *skel;
struct bpf_link *link;
int cgroup_fd;
cgroup_fd = cgroup_setup_and_join(cgroup_rel_path);
if (!ASSERT_OK_FD(cgroup_fd, "cgroup_setup_and_join"))
return;
skel = cgroup_iter_memcg__open_and_load();
if (!ASSERT_OK_PTR(skel, "cgroup_iter_memcg__open_and_load"))
goto cleanup_cgroup_fd;
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
union bpf_iter_link_info linfo = {
.cgroup.cgroup_fd = cgroup_fd,
.cgroup.order = BPF_CGROUP_ITER_SELF_ONLY,
};
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.cgroup_memcg_query, &opts);
if (!ASSERT_OK_PTR(link, "bpf_program__attach_iter"))
goto cleanup_skel;
if (test__start_subtest("cgroup_iter_memcg__anon"))
test_anon(link, &skel->data_query->memcg_query);
if (test__start_subtest("cgroup_iter_memcg__shmem"))
test_shmem(link, &skel->data_query->memcg_query);
if (test__start_subtest("cgroup_iter_memcg__file"))
test_file(link, &skel->data_query->memcg_query);
if (test__start_subtest("cgroup_iter_memcg__kmem"))
test_kmem(link, &skel->data_query->memcg_query);
if (test__start_subtest("cgroup_iter_memcg__pgfault"))
test_pgfault(link, &skel->data_query->memcg_query);
bpf_link__destroy(link);
cleanup_skel:
cgroup_iter_memcg__destroy(skel);
cleanup_cgroup_fd:
close(cgroup_fd);
cleanup_cgroup_environment();
}
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