unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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Some experiments

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This commit is contained in:
Steffo 2024-10-12 03:03:01 +02:00
parent edd435390c
commit 0639cbf43e
Signed by: steffo
GPG key ID: 5ADA3868646C3FC0
1 changed files with 19 additions and 6 deletions
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25
tools/testing/selftests/cachestat/test_cachestat.c
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@ -125,20 +125,27 @@ static int test_cachestat(const char *filename, bool write_random, bool create,
long syscall_ret;
struct cachestat cs;
struct cachestat_range cs_range = { 0, filesize };
ksft_print_msg("Testing cachestat with:\n");
ksft_print_msg("pages [num_pages]: %d\n", num_pages);
ksft_print_msg("pagesize [PS]: %d\n", PS);
ksft_print_msg("file [filename]: %s\n", filename);
ksft_print_msg("filesize [filesize]: %d\n", filesize);
ksft_print_msg("[write_random]: %d\n", write_random);
ksft_print_msg("Opening %s\n", filename);
int fd = open(filename, open_flags, open_mode);
if (fd == -1) {
ksft_print_msg("Unable to create/open file.\n");
ksft_print_msg("Unable to create/open file: %m\n");
ret = KSFT_FAIL;
goto out;
} else {
ksft_print_msg("Create/open %s\n", filename);
}
if (write_random) {
if (!write_exactly(fd, filesize)) {
ksft_print_msg("Unable to access urandom.\n");
ksft_print_msg("Unable to access urandom: \n");
ret = KSFT_FAIL;
goto out1;
}
@ -147,9 +154,10 @@ static int test_cachestat(const char *filename, bool write_random, bool create,
syscall_ret = syscall(__NR_cachestat, fd, &cs_range, &cs, 0);
ksft_print_msg("Cachestat call returned %ld\n", syscall_ret);
ksft_print_msg("Cachestat range is now: %d + %d\n", cs_range.off, cs_range.len);
if (syscall_ret) {
ksft_print_msg("Cachestat returned non-zero.\n");
ksft_print_msg("Cachestat returned: %m\n");
ret = KSFT_FAIL;
goto out1;
@ -157,6 +165,11 @@ static int test_cachestat(const char *filename, bool write_random, bool create,
print_cachestat(&cs);
if (write_random) {
ksft_print_msg("nr_cache is now: %d\n", cs.nr_cache);
ksft_print_msg("nr_evicted is now: %d\n", cs.nr_evicted);
ksft_print_msg("num_pages is now: %d\n", num_pages);
if (cs.nr_cache + cs.nr_evicted != num_pages) {
ksft_print_msg(
"Total number of cached and evicted pages is off.\n");