Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/third_party/rust/gpu-alloc/src/config.rs b/third_party/rust/gpu-alloc/src/config.rs
new file mode 100644
index 0000000000..84442a9fef
--- /dev/null
+++ b/third_party/rust/gpu-alloc/src/config.rs
@@ -0,0 +1,72 @@
+/// Configuration for [`GpuAllocator`]
+///
+/// [`GpuAllocator`]: type.GpuAllocator
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct Config {
+    /// Size in bytes of request that will be served by dedicated memory object.
+    /// This value should be large enough to not exhaust memory object limit
+    /// and not use slow memory object allocation when it is not necessary.
+    pub dedicated_treshold: u64,
+
+    /// Size in bytes of request that will be served by dedicated memory object if preferred.
+    /// This value should be large enough to not exhaust memory object limit
+    /// and not use slow memory object allocation when it is not necessary.
+    ///
+    /// This won't make much sense if this value is larger than `dedicated_treshold`.
+    pub preferred_dedicated_treshold: u64,
+
+    /// Size in bytes of transient memory request that will be served by dedicated memory object.
+    /// This value should be large enough to not exhaust memory object limit
+    /// and not use slow memory object allocation when it is not necessary.
+    ///
+    /// This won't make much sense if this value is lesser than `dedicated_treshold`.
+    pub transient_dedicated_treshold: u64,
+
+    /// Size in bytes for chunks for linear allocator.
+    pub linear_chunk: u64,
+
+    /// Minimal size for buddy allocator.
+    pub minimal_buddy_size: u64,
+
+    /// Initial memory object size for buddy allocator.
+    /// If less than `minimal_buddy_size` then `minimal_buddy_size` is used instead.
+    pub initial_buddy_dedicated_size: u64,
+}
+
+impl Config {
+    /// Returns default configuration.
+    ///
+    /// This is not `Default` implementation to discourage usage outside of
+    /// prototyping.
+    ///
+    /// Proper configuration should depend on hardware and intended usage.\
+    /// But those values can be used as starting point.\
+    /// Note that they can simply not work for some platforms with lesser
+    /// memory capacity than today's "modern" GPU (year 2020).
+    pub fn i_am_prototyping() -> Self {
+        // Assume that today's modern GPU is made of 1024 potatoes.
+        let potato = Config::i_am_potato();
+
+        Config {
+            dedicated_treshold: potato.dedicated_treshold * 1024,
+            preferred_dedicated_treshold: potato.preferred_dedicated_treshold * 1024,
+            transient_dedicated_treshold: potato.transient_dedicated_treshold * 1024,
+            linear_chunk: potato.linear_chunk * 1024,
+            minimal_buddy_size: potato.minimal_buddy_size * 1024,
+            initial_buddy_dedicated_size: potato.initial_buddy_dedicated_size * 1024,
+        }
+    }
+
+    /// Returns default configuration for average sized potato.
+    pub fn i_am_potato() -> Self {
+        Config {
+            dedicated_treshold: 32 * 1024,
+            preferred_dedicated_treshold: 1024,
+            transient_dedicated_treshold: 128 * 1024,
+            linear_chunk: 128 * 1024,
+            minimal_buddy_size: 1,
+            initial_buddy_dedicated_size: 8 * 1024,
+        }
+    }
+}