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Geert Uytterhoeven
0ae446e4b9
The test module to check that free_pages() does not leak memory does not provide any feedback whatsoever its state or progress, but may take some time on slow machines. Add the printing of messages upon starting each phase of the test, and upon completion. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Geert Uytterhoeven <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Matthew Wilcox <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
48 lines
995 B
C
48 lines
995 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* test_free_pages.c: Check that free_pages() doesn't leak memory
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* Copyright (c) 2020 Oracle
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* Author: Matthew Wilcox <[email protected]>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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static void test_free_pages(gfp_t gfp)
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{
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unsigned int i;
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for (i = 0; i < 1000 * 1000; i++) {
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unsigned long addr = __get_free_pages(gfp, 3);
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struct page *page = virt_to_page(addr);
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/* Simulate page cache getting a speculative reference */
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get_page(page);
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free_pages(addr, 3);
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put_page(page);
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}
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}
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static int m_in(void)
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{
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pr_info("Testing with GFP_KERNEL\n");
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test_free_pages(GFP_KERNEL);
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pr_info("Testing with GFP_KERNEL | __GFP_COMP\n");
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test_free_pages(GFP_KERNEL | __GFP_COMP);
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pr_info("Test completed\n");
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return 0;
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}
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static void m_ex(void)
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{
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}
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module_init(m_in);
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module_exit(m_ex);
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MODULE_AUTHOR("Matthew Wilcox <[email protected]>");
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MODULE_LICENSE("GPL");
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