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core-madvise.c
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core-madvise.c
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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2023 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-madvise.h"
#if defined(HAVE_MADVISE)
static const int madvise_options[] = {
#if defined(MADV_NORMAL)
MADV_NORMAL,
#endif
#if defined(MADV_RANDOM)
MADV_RANDOM,
#endif
#if defined(MADV_SEQUENTIAL)
MADV_SEQUENTIAL,
#endif
#if defined(MADV_WILLNEED)
MADV_WILLNEED,
#endif
/*
* Don't use DONTNEED as this can zero fill
* pages that don't have backing store which
* trips checksum errors when we check that
* the pages are sane.
*
#if defined(MADV_DONTNEED)
MADV_DONTNEED,
#endif
*/
#if defined(MADV_DONTFORK)
MADV_DONTFORK,
#endif
#if defined(MADV_DOFORK)
MADV_DOFORK,
#endif
#if defined(MADV_MERGEABLE)
MADV_MERGEABLE,
#endif
#if defined(MADV_UNMERGEABLE)
MADV_UNMERGEABLE,
#endif
#if defined(MADV_HUGEPAGE)
MADV_HUGEPAGE,
#endif
#if defined(MADV_NOHUGEPAGE)
MADV_NOHUGEPAGE,
#endif
#if defined(MADV_DONTDUMP)
MADV_DONTDUMP,
#endif
#if defined(MADV_DODUMP)
MADV_DODUMP,
#endif
#if defined(MADV_COLD)
MADV_COLD,
#endif
#if defined(MADV_PAGEOUT)
MADV_PAGEOUT,
#endif
/*
* Don't use MADV_FREE as this can zero fill
* pages that don't have backing store which
* trips checksum errors when we check that
* the pages are sane.
*
#if defined(MADV_FREE)
MADV_FREE
#endif
*/
/* Linux 5.14 */
#if defined(MADV_POPULATE_READ)
MADV_POPULATE_READ,
#endif
/* Linux 5.14 */
#if defined(MADV_POPULATE_WRITE)
MADV_POPULATE_WRITE,
#endif
};
#endif
/*
* stress_madvise_random()
* apply random madvise setting to a memory region
*/
int stress_madvise_random(void *addr, const size_t length)
{
#if defined(HAVE_MADVISE)
if (g_opt_flags & OPT_FLAGS_MMAP_MADVISE) {
const int i = stress_mwc32modn((uint32_t)SIZEOF_ARRAY(madvise_options));
return madvise(addr, length, madvise_options[i]);
}
#else
UNEXPECTED
(void)addr;
(void)length;
#endif
return 0;
}
/*
* stress_madvise_mergeable()
* apply MADV_MERGEABLE for kernel same page merging
*/
int stress_madvise_mergeable(void *addr, const size_t length)
{
#if defined(MADV_MERGEABLE) && \
defined(HAVE_MADVISE)
return madvise(addr, length, MADV_MERGEABLE);
#else
(void)addr;
(void)length;
return 0;
#endif
}
/*
* stress_madvise_pid_all_pages()
* apply madvise advise to all pages in a progress
*/
void stress_madvise_pid_all_pages(const pid_t pid, const int advise)
{
#if defined(HAVE_MADVISE) && \
defined(__linux__)
FILE *fp;
char path[PATH_MAX];
char buf[4096];
(void)snprintf(path, sizeof(path), "/proc/%" PRIdMAX "/maps", (intmax_t)pid);
fp = fopen(path, "r");
if (!fp)
return;
while (fgets(buf, sizeof(buf), fp)) {
void *start, *end, *offset;
int major, minor, n;
uint64_t inode;
char prot[5];
n = sscanf(buf, "%p-%p %4s %p %x:%x %" PRIu64 " %s\n",
&start, &end, prot, &offset, &major, &minor,
&inode, path);
if (n < 7)
continue; /* bad sscanf data */
if (start >= end)
continue; /* invalid address range */
VOID_RET(int, madvise(start, (size_t)((uint8_t *)end - (uint8_t *)start), advise));
/*
* Readable protection? read pages
*/
if ((prot[0] == 'r') && (path[0] != '[')) {
const size_t page_size = stress_get_page_size();
volatile uint8_t *ptr = (volatile uint8_t *)start;
while (ptr < (uint8_t *)end) {
(*ptr);
ptr += page_size;
}
}
}
(void)fclose(fp);
#else
(void)pid;
(void)advise;
#endif
}