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lib: extract drmtest_permute_array

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Lots of tests need to create havoc to LRUs in the kernel or otherwise
need to shuffle things around a bit. So make a small array permutation
function available.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-01-22 20:09:54 +01:00
parent 1a9fa8fd12
commit fbfe374b28
3 changed files with 22 additions and 15 deletions
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16
lib/drmtest.c
View File

@ -332,6 +332,22 @@ void drmtest_stop_signal_helper(void)
signal_helper = -1;
}
/* other helpers */
void drmtest_permute_array(void *array, unsigned size,
void (*exchange_func)(void *array,
unsigned i,
unsigned j))
{
int i;
for (i = size - 1; i > 1; i--) {
/* yes, not perfectly uniform, who cares */
long l = random() % (i +1);
if (i != l)
exchange_func(array, i, l);
}
}
/* mappable aperture trasher helper */
drm_intel_bo **trash_bos;
int num_trash_bos;

4
lib/drmtest.h
View File

@ -55,6 +55,10 @@ uint64_t gem_mappable_aperture_size(void);
/* generally useful helpers */
void drmtest_fork_signal_helper(void);
void drmtest_stop_signal_helper(void);
void drmtest_permute_array(void *array, unsigned size,
void (*exchange_func)(void *array,
unsigned i,
unsigned j));
/* helpers based upon the libdrm buffer manager */
void drmtest_init_aperture_trashers(drm_intel_bufmgr *bufmgr);

17
tests/gem_stress.c
View File

@ -492,19 +492,6 @@ static void init_buffer(struct scratch_buf *buf, unsigned size)
buf->num_tiles = options.tiles_per_buf;
}
static void permute_array(void *array, unsigned size,
void (*exchange_func)(void *array, unsigned i, unsigned j))
{
int i;
for (i = size - 1; i > 1; i--) {
/* yes, not perfectly uniform, who cares */
long l = random() % (i +1);
if (i != l)
exchange_func(array, i, l);
}
}
static void exchange_buf(void *array, unsigned i, unsigned j)
{
struct scratch_buf *buf_arr, tmp;
@ -521,7 +508,7 @@ static void init_set(unsigned set)
long int r;
int i;
permute_array(buffers[set], num_buffers, exchange_buf);
drmtest_permute_array(buffers[set], num_buffers, exchange_buf);
if (current_set == 1 && options.gpu_busy_load == 0) {
gpu_busy_load++;
@ -924,7 +911,7 @@ int main(int argc, char **argv)
for (j = 0; j < num_total_tiles; j++)
current_permutation[j] = j;
permute_array(current_permutation, num_total_tiles, exchange_uint);
drmtest_permute_array(current_permutation, num_total_tiles, exchange_uint);
copy_tiles(current_permutation);