On 2020-01-23 at 12:27:11 +0000, Chris Wilson wrote:
> For our threaded clear test, we want to create as many buffers as can
> fit into the available memory. However, since we don't know the size of
> that available memory, it can be easy to create too large or too many
> buffers, and waste our time testing the unobtainable. Instead, try
> probing the available space by trying to create the largest dumb buffer
> we possibly can, and assume that is the equivalent to the available
> space.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> ---
> tests/dumb_buffer.c | 68 +++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 59 insertions(+), 9 deletions(-)
>
> diff --git a/tests/dumb_buffer.c b/tests/dumb_buffer.c
> index 3d2dc9966..c1e7b4d3b 100644
> --- a/tests/dumb_buffer.c
> +++ b/tests/dumb_buffer.c
> @@ -31,18 +31,18 @@
> * combinations are rejected.
> */
>
> -#include <stdlib.h>
> -#include <sys/ioctl.h>
> -#include <stdio.h>
> -#include <string.h>
> +#include <errno.h>
> #include <fcntl.h>
> #include <inttypes.h>
> -#include <errno.h>
> -#include <sys/stat.h>
> -#include <sys/time.h>
> -#include <getopt.h>
> #include <pthread.h>
> +#include <signal.h>
> #include <stdatomic.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +#include <sys/stat.h>
> +#include <sys/time.h>
>
> #include <drm.h>
>
> @@ -325,12 +325,62 @@ static void *thread_clear(void *data)
> return (void *)(uintptr_t)checked;
> }
>
> +static jmp_buf sigjmp;
> +
> +static void sigprobe(int sig)
> +{
> + longjmp(sigjmp, sig);
> +}
> +
> +static uint64_t estimate_largest_dumb_buffer(int fd)
> +{
> + sighandler_t old_sigbus = signal(SIGBUS, sigprobe);
> + sighandler_t old_sigsegv = signal(SIGSEGV, sigprobe);
> + struct drm_mode_create_dumb create = {
> + .bpp = 32,
> + .width = 1 << 20, /* in pixels */
> + .height = 1, /* in rows */
> + };
> + volatile uint64_t largest = 0;
> + char * volatile ptr = NULL;
> +
> + if (setjmp(sigjmp)) {
> + if (ptr)
> + munmap(ptr, create.size);
> +
> + signal(SIGBUS, old_sigbus);
> + signal(SIGSEGV, old_sigsegv);
> +
> + igt_info("Largest dumb buffer sucessfully created: %'"PRIu64" bytes\n",
> + largest);
> + return largest / PAGE_SIZE;
> + }
> +
> + for (create.height = 1; create.height; create.height *= 2) {
> + if (__dumb_create(fd, &create))
> + longjmp(sigjmp, SIGABRT);
> +
> + ptr = __dumb_map(fd, create.handle, create.size, PROT_READ);
> + dumb_destroy(fd, create.handle);
> + if (!ptr)
> + longjmp(sigjmp, SIGABRT);
> +
> + if (!*ptr)
> + largest = create.size;
> +
> + munmap(ptr, create.size);
> + ptr = NULL;
> + }
> +
> + longjmp(sigjmp, SIGABRT);
> +}
> +
> static void always_clear(int fd, int timeout)
> {
> struct thread_clear arg = {
> .fd = fd,
> .timeout = timeout,
> - .max = intel_get_avail_ram_mb() << (20 - 12), /* in pages */
> + .max = estimate_largest_dumb_buffer(fd), /* in pages */
LGTM. I will test with other required LMEM changes.
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> };
> const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
> unsigned long checked;
> --
> 2.25.0
>
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