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lib/test_vmalloc.c: Add test cases for kvfree_rcu()

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Introduce four new test cases for testing the kvfree_rcu()
interface. Two of them belong to single argument functionality
and another two for 2-argument functionality.

The aim is to stress and check how kvfree_rcu() behaves under
different load and memory conditions and analyze its performance
throughput.

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2020-05-25 23:48:00 +02:00 committed by Paul E. McKenney
parent 1835f475e3
commit da4fc00abb
1 changed files with 95 additions and 8 deletions
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103
lib/test_vmalloc.c
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@ -15,6 +15,8 @@
#include <linux/delay.h>
#include <linux/rwsem.h>
#include <linux/mm.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#define __param(type, name, init, msg) \
static type name = init; \
@ -35,14 +37,18 @@ __param(int, test_loop_count, 1000000,
__param(int, run_test_mask, INT_MAX,
"Set tests specified in the mask.\n\n"
"\t\tid: 1, name: fix_size_alloc_test\n"
"\t\tid: 2, name: full_fit_alloc_test\n"
"\t\tid: 4, name: long_busy_list_alloc_test\n"
"\t\tid: 8, name: random_size_alloc_test\n"
"\t\tid: 16, name: fix_align_alloc_test\n"
"\t\tid: 32, name: random_size_align_alloc_test\n"
"\t\tid: 64, name: align_shift_alloc_test\n"
"\t\tid: 128, name: pcpu_alloc_test\n"
"\t\tid: 1, name: fix_size_alloc_test\n"
"\t\tid: 2, name: full_fit_alloc_test\n"
"\t\tid: 4, name: long_busy_list_alloc_test\n"
"\t\tid: 8, name: random_size_alloc_test\n"
"\t\tid: 16, name: fix_align_alloc_test\n"
"\t\tid: 32, name: random_size_align_alloc_test\n"
"\t\tid: 64, name: align_shift_alloc_test\n"
"\t\tid: 128, name: pcpu_alloc_test\n"
"\t\tid: 256, name: kvfree_rcu_1_arg_vmalloc_test\n"
"\t\tid: 512, name: kvfree_rcu_2_arg_vmalloc_test\n"
"\t\tid: 1024, name: kvfree_rcu_1_arg_slab_test\n"
"\t\tid: 2048, name: kvfree_rcu_2_arg_slab_test\n"
/* Add a new test case description here. */
);
@ -316,6 +322,83 @@ pcpu_alloc_test(void)
return rv;
}
struct test_kvfree_rcu {
struct rcu_head rcu;
unsigned char array[20];
};
static int
kvfree_rcu_1_arg_vmalloc_test(void)
{
struct test_kvfree_rcu *p;
int i;
for (i = 0; i < test_loop_count; i++) {
p = vmalloc(1 * PAGE_SIZE);
if (!p)
return -1;
p->array[0] = 'a';
kvfree_rcu(p);
}
return 0;
}
static int
kvfree_rcu_2_arg_vmalloc_test(void)
{
struct test_kvfree_rcu *p;
int i;
for (i = 0; i < test_loop_count; i++) {
p = vmalloc(1 * PAGE_SIZE);
if (!p)
return -1;
p->array[0] = 'a';
kvfree_rcu(p, rcu);
}
return 0;
}
static int
kvfree_rcu_1_arg_slab_test(void)
{
struct test_kvfree_rcu *p;
int i;
for (i = 0; i < test_loop_count; i++) {
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -1;
p->array[0] = 'a';
kvfree_rcu(p);
}
return 0;
}
static int
kvfree_rcu_2_arg_slab_test(void)
{
struct test_kvfree_rcu *p;
int i;
for (i = 0; i < test_loop_count; i++) {
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -1;
p->array[0] = 'a';
kvfree_rcu(p, rcu);
}
return 0;
}
struct test_case_desc {
const char *test_name;
int (*test_func)(void);
@ -330,6 +413,10 @@ static struct test_case_desc test_case_array[] = {
{ "random_size_align_alloc_test", random_size_align_alloc_test },
{ "align_shift_alloc_test", align_shift_alloc_test },
{ "pcpu_alloc_test", pcpu_alloc_test },
{ "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test },
{ "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test },
{ "kvfree_rcu_1_arg_slab_test", kvfree_rcu_1_arg_slab_test },
{ "kvfree_rcu_2_arg_slab_test", kvfree_rcu_2_arg_slab_test },
/* Add a new test case here. */
};