67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <linux/mman.h>
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#include "kselftest.h"
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int main(int argc, char *argv[])
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{
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const size_t alloc_size = 2 * 1024 * 1024;
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int retry_count = 10;
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bool dropped;
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void *alloc;
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ksft_print_header();
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ksft_set_plan(1);
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alloc = mmap(0, alloc_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0);
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if (alloc == MAP_FAILED) {
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if ((errno == EOPNOTSUPP) || (errno == EINVAL)) {
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ksft_test_result_skip("MAP_DROPPABLE not supported\n");
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exit(KSFT_SKIP);
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}
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ksft_test_result_fail("mmap error: %s\n", strerror(errno));
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exit(KSFT_FAIL);
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}
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memset(alloc, 'A', alloc_size);
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while (retry_count--) {
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if (madvise(alloc, alloc_size, MADV_PAGEOUT)) {
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if (errno == EINVAL) {
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ksft_test_result_skip("madvise(MADV_PAGEOUT) not supported\n");
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exit(KSFT_SKIP);
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}
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ksft_test_result_fail("madvise(MADV_PAGEOUT) error: %s\n", strerror(errno));
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exit(KSFT_FAIL);
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}
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dropped = memchr(alloc, 'A', alloc_size) == NULL;
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/*
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* Speculative reference can temporarily prevent some
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* pages from getting dropped. So sleep and retry.
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*
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* If a page is not droppable for 10s, something
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* is seriously messed up and we want to fail.
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*/
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if (dropped)
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break;
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sleep(1);
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}
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ksft_test_result(dropped, "madvise(MADV_PAGEOUT) behavior\n");
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ksft_finished();
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}
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