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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
*/
/*\
* [Description]
*
* Allocate anonymous memory pages inside child and reclaim it with
* MADV_PAGEOUT. Then check if memory pages have been swapped out by looking
* at smaps information.
*
* The advice might be ignored for some pages in the range when it is
* not applicable, so test passes if swap memory increases after
* reclaiming memory with MADV_PAGEOUT.
*/
#define _GNU_SOURCE
#include <sys/mman.h>
#include "tst_test.h"
#include "lapi/mmap.h"
#include "lapi/syscalls.h"
#include "process_madvise.h"
#define MEM_CHILD (1 * TST_MB)
static void **data_ptr;
static void child_alloc(void)
{
char data[MEM_CHILD];
struct addr_mapping map_before;
struct addr_mapping map_after;
memset(data, 'a', MEM_CHILD);
tst_res(TINFO, "Allocate memory: %d bytes", MEM_CHILD);
*data_ptr = SAFE_MMAP(NULL, MEM_CHILD,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
memset(*data_ptr, 'a', MEM_CHILD);
memset(&map_before, 0, sizeof(struct addr_mapping));
read_address_mapping((unsigned long)*data_ptr, &map_before);
TST_CHECKPOINT_WAKE_AND_WAIT(0);
memset(&map_after, 0, sizeof(struct addr_mapping));
read_address_mapping((unsigned long)*data_ptr, &map_after);
if (memcmp(*data_ptr, data, MEM_CHILD) != 0) {
tst_res(TFAIL, "Dirty memory after reclaiming it");
return;
}
SAFE_MUNMAP(*data_ptr, MEM_CHILD);
*data_ptr = NULL;
TST_EXP_EXPR(map_before.swap < map_after.swap,
"Most of the memory has been swapped out: %dkB out of %dkB",
map_after.swap - map_before.swap,
MEM_CHILD / TST_KB);
}
static void setup(void)
{
data_ptr = SAFE_MMAP(NULL, sizeof(void *),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
}
static void cleanup(void)
{
if (*data_ptr)
SAFE_MUNMAP(*data_ptr, MEM_CHILD);
if (data_ptr)
SAFE_MUNMAP(data_ptr, sizeof(void *));
}
static void run(void)
{
int ret;
int pidfd;
pid_t pid_alloc;
struct iovec vec;
pid_alloc = SAFE_FORK();
if (!pid_alloc) {
child_alloc();
return;
}
TST_CHECKPOINT_WAIT(0);
tst_res(TINFO, "Reclaim memory using MADV_PAGEOUT");
pidfd = SAFE_PIDFD_OPEN(pid_alloc, 0);
vec.iov_base = *data_ptr;
vec.iov_len = MEM_CHILD;
ret = tst_syscall(__NR_process_madvise, pidfd, &vec, 1UL,
MADV_PAGEOUT, 0UL);
if (ret == -1)
tst_brk(TBROK | TERRNO, "process_madvise failed");
if (ret != MEM_CHILD)
tst_brk(TBROK, "process_madvise reclaimed only %d bytes", ret);
TST_CHECKPOINT_WAKE(0);
}
static struct tst_test test = {
.setup = setup,
.cleanup = cleanup,
.test_all = run,
.forks_child = 1,
.min_kver = "5.10",
.needs_checkpoints = 1,
.needs_root = 1,
.min_swap_avail = MEM_CHILD / TST_MB,
.needs_kconfigs = (const char *[]) {
"CONFIG_SWAP=y",
NULL
},
};
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