18 mar 2017 05:24 "Jason Ekstrand" <[email protected]> napisał(a):
Instead of just advertising the aperture size, we do something more intelligent. On systems with a full 48-bit PPGTT, we can address 100% of the available system RAM from the GPU. In order to keep clients from burning 100% of your available RAM for graphics resources, we have a nice little heuristic (which has received exactly zero tuning) to keep things under a reasonable level of control. Cc: Alex Smith <[email protected]> --- src/intel/vulkan/anv_device.c | 61 ++++++++++++++++++++++++++++++ +++--------- src/intel/vulkan/anv_gem.c | 16 +++++++++++ src/intel/vulkan/anv_private.h | 13 ++++++++- 3 files changed, 76 insertions(+), 14 deletions(-) diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c index 8994e70..fd71a23 100644 --- a/src/intel/vulkan/anv_device.c +++ b/src/intel/vulkan/anv_device.c @@ -25,6 +25,7 @@ #include <stdbool.h> #include <string.h> #include <sys/mman.h> +#include <sys/sysinfo.h> #include <unistd.h> #include <fcntl.h> #include <xf86drm.h> @@ -53,6 +54,48 @@ compiler_perf_log(void *data, const char *fmt, ...) va_end(args); } +static VkResult +anv_compute_heap_size(int fd, uint64_t *heap_size) +{ + uint64_t gtt_size; + if (anv_gem_get_context_param(fd, 0, I915_CONTEXT_PARAM_GTT_SIZE, + >t_size) == -1) { + /* If, for whatever reason, we can't actually get the GTT size from the + * kernel (too old?) fall back to the aperture size. + */ + anv_perf_warn("Failed to get I915_CONTEXT_PARAM_GTT_SIZE: %m"); + + if (anv_gem_get_aperture(fd, >t_size) == -1) { + return vk_errorf(VK_ERROR_INITIALIZATION_FAILED, + "failed to get aperture size: %m"); + } + } + + /* Query the total ram from the system */ + struct sysinfo info; + sysinfo(&info); + + uint64_t total_ram = (uint64_t)info.totalram * (uint64_t)info.mem_unit; + + /* We don't want to burn too much ram with the GPU. If the user has 4GiB + * or less, we use at most half. If they have more than 4GiB, we use 3/4. + */ + uint64_t available_ram; + if (total_ram < 4ull * 1024ull * 1024ull * 1024ull) + available_ram = total_ram / 2; + else + available_ram = total_ram * 3 / 4; This will result in 3/4 in case of exactly 4GB of RAM present. Did you mean to use <= instead of <? Regards, Gustaw
_______________________________________________ mesa-dev mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/mesa-dev
