/*
* This test creates N threads with a shared kmem cache. They then all
* concurrently allocate and free from the cache to stress the locking and
* concurrent cache performance. If any one test takes longer than 5
* seconds to complete it is treated as a failure and may indicate a
* performance regression. On my test system no one test takes more
* than 1 second to complete so a 5x slowdown likely a problem.
*/
static int
splat_kmem_test10(struct file *file, void *arg)
{
uint64_t size, alloc, rc = 0;
for (size = 16; size <= 1024*1024; size *= 2) {
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "name",
"time (sec)\tslabs \tobjs \thash\n");
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "",
" \ttot/max/calc\ttot/max/calc\n");
for (alloc = 1; alloc <= 1024; alloc *= 2) {
/* Skip tests which exceed available memory. We
* leverage availrmem here for some extra testing */
if (size * alloc * SPLAT_KMEM_THREADS > availrmem / 2)
continue;
rc = splat_kmem_cache_thread_test(file, arg,
SPLAT_KMEM_TEST10_NAME, size, alloc, 5);
if (rc)
break;
}
}
return rc;
}
/*
* This test creates N threads with a shared kmem cache. They then all
* concurrently allocate and free from the cache to stress the locking and
* concurrent cache performance. If any one test takes longer than 5
* seconds to complete it is treated as a failure and may indicate a
* performance regression. On my test system no one test takes more
* than 1 second to complete so a 5x slowdown likely a problem.
*/
static int
splat_kmem_test10(struct file *file, void *arg)
{
uint64_t size, alloc, maxsize, limit, rc = 0;
#if defined(CONFIG_64BIT)
maxsize = (1024 * 1024);
#else
maxsize = (128 * 1024);
#endif
for (size = 32; size <= maxsize; size *= 2) {
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "name",
"time (sec)\tslabs \tobjs \thash\n");
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "",
" \ttot/max/calc\ttot/max/calc\n");
for (alloc = 1; alloc <= 1024; alloc *= 2) {
/* Skip tests which exceed 1/2 of memory. */
limit = MIN(physmem * PAGE_SIZE,
vmem_size(NULL, VMEM_ALLOC | VMEM_FREE)) / 2;
if (size * alloc * SPLAT_KMEM_THREADS > limit)
continue;
rc = splat_kmem_cache_thread_test(file, arg,
SPLAT_KMEM_TEST10_NAME, size, alloc, 5);
if (rc)
break;
}
}
return rc;
}
/*
* This test creates N threads with a shared kmem cache which overcommits
* memory by 4x. This makes it impossible for the slab to satify the
* thread requirements without having its reclaim hook run which will
* free objects back for use. This behavior is triggered by the linum VM
* detecting a low memory condition on the node and invoking the shrinkers.
* This should allow all the threads to complete while avoiding deadlock
* and for the most part out of memory events. This is very tough on the
* system so it is possible the test app may get oom'ed. This particular
* test has proven troublesome on 32-bit archs with limited virtual
* address space so it only run on 64-bit systems.
*/
static int
splat_kmem_test11(struct file *file, void *arg)
{
uint64_t size, alloc, rc;
size = 256*1024;
alloc = ((4 * physmem * PAGE_SIZE) / size) / SPLAT_KMEM_THREADS;
splat_vprint(file, SPLAT_KMEM_TEST11_NAME, "%-22s %s", "name",
"time (sec)\tslabs \tobjs \thash\n");
splat_vprint(file, SPLAT_KMEM_TEST11_NAME, "%-22s %s", "",
" \ttot/max/calc\ttot/max/calc\n");
rc = splat_kmem_cache_thread_test(file, arg,
SPLAT_KMEM_TEST11_NAME, size, alloc, 60);
return rc;
}