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igt/gem_close_race: Increase GPU load

Browse Source 
Increate the GPU load slightly, but mitigate the CPU overhead from
clflushing by keeping the object alive using flink. This has also the
side-effect of magnifying the desired busy-close race.

References: https://bugs.freedesktop.org/show_bug.cgi?id=71029
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-07-12 09:06:39 +01:00
parent b9c705f4da
commit e74dd22ff8
1 changed files with 24 additions and 20 deletions
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44
tests/gem_close_race.c
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@ -42,7 +42,7 @@
#include "drmtest.h"
#include "intel_chipset.h"
#define OBJECT_SIZE 4096
#define OBJECT_SIZE (256 * 1024)
#define COPY_BLT_CMD (2<<29|0x53<<22|0x6)
#define BLT_WRITE_ALPHA (1<<21)
@ -151,6 +151,7 @@ static void run(int child)
struct thread {
pthread_mutex_t mutex;
int device;
int fds[NUM_FD];
int done;
};
@ -158,58 +159,58 @@ struct thread {
static void *thread_run(void *_data)
{
struct thread *t = _data;
uint32_t handle = gem_create(t->device, OBJECT_SIZE);
struct drm_gem_open arg = { gem_flink(t->device, handle) };
pthread_mutex_lock(&t->mutex);
while (!t->done) {
pthread_mutex_unlock(&t->mutex);
for (int n = 0; n < NUM_FD; n++) {
struct drm_i915_gem_create create;
int fd = t->fds[n];
create.handle = 0;
create.size = OBJECT_SIZE;
drmIoctl(t->fds[n], DRM_IOCTL_I915_GEM_CREATE, &create);
if (create.handle == 0)
arg.handle = 0;
drmIoctl(fd, DRM_IOCTL_GEM_OPEN, &arg);
if (arg.handle == 0)
continue;
selfcopy(t->fds[n], create.handle, 100);
selfcopy(fd, arg.handle, 100);
drmIoctl(t->fds[n], DRM_IOCTL_GEM_CLOSE, &create.handle);
drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &arg.handle);
}
pthread_mutex_lock(&t->mutex);
}
pthread_mutex_unlock(&t->mutex);
gem_close(t->device, handle);
return 0;
}
static void *thread_busy(void *_data)
{
struct thread *t = _data;
int n;
uint32_t handle = gem_create(t->device, OBJECT_SIZE);
struct drm_gem_open arg = { gem_flink(t->device, handle) };
pthread_mutex_lock(&t->mutex);
while (!t->done) {
struct drm_i915_gem_create create;
struct drm_i915_gem_busy busy;
int fd = t->fds[rand() % NUM_FD];
pthread_mutex_unlock(&t->mutex);
n = rand() % NUM_FD;
create.handle = 0;
create.size = OBJECT_SIZE;
drmIoctl(t->fds[n], DRM_IOCTL_I915_GEM_CREATE, &create);
if (create.handle == 0)
arg.handle = 0;
drmIoctl(fd, DRM_IOCTL_GEM_OPEN, &arg);
if (arg.handle == 0)
continue;
selfcopy(t->fds[n], create.handle, 10);
selfcopy(fd, arg.handle, 10);
busy.handle = create.handle;
drmIoctl(t->fds[n], DRM_IOCTL_I915_GEM_BUSY, &busy);
busy.handle = arg.handle;
drmIoctl(fd, DRM_IOCTL_I915_GEM_BUSY, &busy);
drmIoctl(t->fds[n], DRM_IOCTL_GEM_CLOSE, &create.handle);
drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &arg.handle);
usleep(10*1000);
@ -217,6 +218,7 @@ static void *thread_busy(void *_data)
}
pthread_mutex_unlock(&t->mutex);
gem_close(t->device, handle);
return 0;
}
@ -250,6 +252,7 @@ igt_main
igt_assert(data);
pthread_mutex_init(&data->mutex, NULL);
data->device = open(device, O_RDWR);
for (n = 0; n < NUM_FD; n++)
data->fds[n] = open(device, O_RDWR);
@ -275,6 +278,7 @@ igt_main
for (n = 0; n < NUM_FD; n++)
close(data->fds[n]);
close(data->device);
free(data);
}
}