mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-04 02:18:37 +00:00
80ae5a2395
Bug is not really fixed, instead the SHM_HUGETLB flag is ignored. Note that it is not straightforward to properly fix this, as this implies either to learn aspacemgr what huge pages are. Also, the trick used in the fix for 333051 cannot be used easily, because the SHM_HUGETLB flag is given in shmget, while the mmap is done in shmat. So, the easiest is to just ignore the SHM_HUGETLB flag. SHM_HUGETLB is supposed to only give a performance impact. Ignoring it should be benign. Theoretically, the caller might expect a sucessful shmget(SHM_HUGETLB)+shmat to give pages aligned on e.g. 1MB. In this case, bad luck, the program will misbehave under valgrind. To warn of this, a warning is given (once) when SHM_HUGETLB is seen. The map_unmap.c test has been restructured somewaht to allow TEST_SHM_HUGETLB to be tested independently (or not) of the TEST_MAP_HUGETLB. Note also that by default, testing MAP_HUGETLB and SHM_HUGETLB is disabled as usually, huge pages are not enabled. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14683
157 lines
3.3 KiB
C
157 lines
3.3 KiB
C
#include <stdio.h>
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#include "tests/sys_mman.h"
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#include <stdlib.h>
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#include <unistd.h>
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/* The code testing MAP_HUGETLB huge pages is disabled by default,
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as many distros do not have huge pages configured
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by default.
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To have e.g. 20 huge pages configured, do (as root)
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echo 20 > /proc/sys/vm/nr_hugepages
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Once this is done, uncomment the below, and recompile.
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*/
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//#define TEST_MAP_HUGETLB 1
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/* Similarly, testing SHM_HUGETLB huge pages is disabled by default.
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To have shmget/shmat big pages working, do (as root)
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echo 500 > /proc/sys/vm/hugetlb_shm_group
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where 500 is the groupid of the user that runs this test
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Once this is done, uncomment the below, and recompile.
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*/
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//#define TEST_SHM_HUGETLB 1
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// Size to use for huge pages
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#define HUGESZ (4 * 1024 * 1024)
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#ifdef TEST_MAP_HUGETLB
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/* Ensure this compiles on pre 2.6 systems, or on glibc missing MAP_HUGETLB */
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#ifndef MAP_HUGETLB
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/* The below works for me on an f12/x86 linux */
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#define MAP_HUGETLB 0x40000
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#endif
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#endif /* TEST_MAP_HUGETLB */
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#ifdef TEST_SHM_HUGETLB
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/stat.h>
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#ifndef SHM_HUGETLB
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#define SHM_HUGETLB 04000
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#endif
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#endif /* TEST_SHM_HUGETLB */
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static unsigned int pagesize;
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#define PAGES 1024u
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#define LEN (PAGES*pagesize)
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static void *domap(size_t len, int addflags)
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{
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void *ret = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|addflags, -1, 0);
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if (ret == (void *)-1) {
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perror("mmap");
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exit(1);
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}
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return ret;
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}
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/* unmap in pieces to exercise munmap more */
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static void nibblemap(void *p)
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{
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int off;
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int i;
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off = (random() % LEN) & ~(pagesize-1);
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for(i = 0; i < PAGES; i++) {
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/* printf("unmapping off=%d\n", off/pagesize); */
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munmap((char *)p + off, pagesize);
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off += 619*pagesize;
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off %= LEN;
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}
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}
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static void prmaps()
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{
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char buf[100];
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sprintf(buf, "/bin/cat /proc/%d/maps", getpid());
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system(buf);
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exit(1);
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}
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int main()
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{
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int i;
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void *expect1, *expect2;
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pagesize = getpagesize();
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expect1 = domap(LEN, 0);
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expect2 = domap(LEN, 0);
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munmap(expect1, LEN);
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munmap(expect2, LEN);
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for(i = 0; i < 5; i++) {
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void *m1, *m2;
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m1 = domap(LEN, 0);
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if (m1 != expect1) {
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printf("FAIL i=%d: m1=%p expect1=%p\n",
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i, m1, expect1);
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prmaps();
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return 1;
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}
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m2 = domap(LEN, 0);
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if (m2 != expect2) {
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printf("FAIL i=%d: m2=%p expect2=%p\n",
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i, m2, expect2);
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prmaps();
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return 1;
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}
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nibblemap(m2);
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munmap(m1, LEN);
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}
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#ifdef TEST_MAP_HUGETLB
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{
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void *expect3;
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expect3 = domap(HUGESZ, MAP_HUGETLB);
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munmap(expect3, HUGESZ);
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}
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#endif
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#ifdef TEST_SHM_HUGETLB
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{
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int shmid;
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void *expect4;
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shmid = shmget(IPC_PRIVATE, HUGESZ,
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IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | SHM_HUGETLB);
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if (shmid == -1) {
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perror("shmget");
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exit(1);
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}
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expect4 = shmat(shmid, NULL, 0);
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if (expect4 == (void*) -1){
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perror("shmat");
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exit(1);
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}
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if (shmdt(expect4) != 0) {
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perror("shmdt");
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exit(1);
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}
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if (shmctl(shmid, IPC_RMID, 0) != 0) {
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perror("shmctl IPC_RMID");
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exit(1);
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}
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}
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#endif
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printf("PASS\n");
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return 0;
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}
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