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gem_stress: Add an option to test handling of signals

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As signals cause the syscalls to be interrupted, we often need to clean
up partial state before returning to userspace. Often a source of
unamusing bugs, so encourage gem_stress to provoke them.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-07-02 08:59:32 +01:00
parent 8908055da6
commit 4227da8c3c
2 changed files with 41 additions and 0 deletions
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40
tests/gem_stress.c
View File

@ -51,6 +51,8 @@
#include "gem_stress.h"
#include <signal.h>
#define CMD_POLY_STIPPLE_OFFSET 0x7906
/** TODO:
@ -100,6 +102,29 @@ struct {
unsigned max_failed_reads;
} stats;
static void signal_helper_process(pid_t pid)
{
/* Interrupt the parent process at 500Hz, just to be annoying */
while (1) {
usleep(1000 * 1000 / 500);
if (kill(pid, SIGUSR1)) /* Parent has died, so must we. */
exit(0);
}
}
static pid_t fork_signal_helper(void)
{
pid_t pid;
pid = fork();
if (pid == 0) {
signal_helper_process(getppid());
return -1;
}
return pid;
}
static void tile2xy(struct scratch_buf *buf, unsigned tile, unsigned *x, unsigned *y)
{
assert(tile < buf->num_tiles);
@ -651,6 +676,7 @@ static void parse_options(int argc, char **argv)
{"no-hw", 0, 0, 'd'},
{"buf-size", 1, 0, 's'},
{"gpu-busy-load", 1, 0, 'g'},
{"no-signals", 0, 0, 'S'},
{"buffer-count", 1, 0, 'c'},
{"trace-tile", 1, 0, 't'},
{"disable-blt", 0, 0, 'b'},
@ -671,6 +697,7 @@ static void parse_options(int argc, char **argv)
options.scratch_buf_size = 256*4096;
options.no_hw = 0;
options.use_signal_helper = 1;
options.gpu_busy_load = 0;
options.num_buffers = 0;
options.trace_tile = -1;
@ -692,6 +719,10 @@ static void parse_options(int argc, char **argv)
options.no_hw = 1;
printf("no-hw debug mode\n");
break;
case 'S':
options.use_signal_helper = 0;
printf("disabling that pesky nuisance who keeps interrupting us\n");
break;
case 's':
tmp = atoi(optarg);
if (tmp < options.tile_size*8192)
@ -881,12 +912,18 @@ int main(int argc, char **argv)
{
int i, j;
unsigned *current_permutation, *tmp_permutation;
pid_t signal_helper = -1;
drm_fd = drm_open_any();
devid = intel_get_drm_devid(drm_fd);
parse_options(argc, argv);
/* start our little helper early before too may allocations occur */
signal(SIGUSR1, SIG_IGN);
if (options.use_signal_helper)
signal_helper = fork_signal_helper();
init();
check_render_copyfunc();
@ -935,5 +972,8 @@ int main(int argc, char **argv)
close(drm_fd);
if (signal_helper != -1)
kill(signal_helper, SIGQUIT);
return 0;
}

1
tests/gem_stress.h
View File

@ -42,6 +42,7 @@ struct option_struct {
int ducttape;
int tile_size;
int check_render_cpyfn;
int use_signal_helper;
};
extern struct option_struct options;