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selftests/damon/access_memory: add repeat mode

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'access_memory' is an artificial memory access generator program that is
used for a few DAMON selftests.  It accesses a given number of regions one
by one only once, and exits.  Depending on systems, the test workload may
exit faster than expected, making the tests unreliable.  For reliable
control of the artificial memory access pattern, add a mode to make it
repeat running.

Link: https://lkml.kernel.org/r/20260117020731.226785-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-01-16 18:07:26 -08:00 committed by Andrew Morton
parent 891d206e27
commit 514d1bcb58
1 changed files with 21 additions and 8 deletions
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29
tools/testing/selftests/damon/access_memory.c
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@ -8,6 +8,11 @@
#include <string.h>
#include <time.h>
enum access_mode {
ACCESS_MODE_ONCE,
ACCESS_MODE_REPEAT,
};
int main(int argc, char *argv[])
{
char **regions;
@ -15,10 +20,12 @@ int main(int argc, char *argv[])
int nr_regions;
int sz_region;
int access_time_ms;
enum access_mode mode = ACCESS_MODE_ONCE;
int i;
if (argc != 4) {
printf("Usage: %s <number> <size (bytes)> <time (ms)>\n",
if (argc < 4) {
printf("Usage: %s <number> <size (bytes)> <time (ms)> [mode]\n",
argv[0]);
return -1;
}
@ -27,15 +34,21 @@ int main(int argc, char *argv[])
sz_region = atoi(argv[2]);
access_time_ms = atoi(argv[3]);
if (argc > 4 && !strcmp(argv[4], "repeat"))
mode = ACCESS_MODE_REPEAT;
regions = malloc(sizeof(*regions) * nr_regions);
for (i = 0; i < nr_regions; i++)
regions[i] = malloc(sz_region);
for (i = 0; i < nr_regions; i++) {
start_clock = clock();
while ((clock() - start_clock) * 1000 / CLOCKS_PER_SEC <
access_time_ms)
memset(regions[i], i, sz_region);
}
do {
for (i = 0; i < nr_regions; i++) {
start_clock = clock();
while ((clock() - start_clock) * 1000 / CLOCKS_PER_SEC
< access_time_ms)
memset(regions[i], i, sz_region);
}
} while (mode == ACCESS_MODE_REPEAT);
return 0;
}