improving device allocator

.gitea/workflows/Test.yml

@@ -61,17 +61,9 @@ jobs:
         which deqp-runner && deqp-runner --version || echo "deqp-runner not found"
 
     - name: Run Vulkan CTS
-      run: zig build cts-soft --release=fast -Ddebug-allocator=true -- -j1
+      run: zig build cts-soft --release=fast -- -j3
       continue-on-error: true
 
-    - name: Upload CTS runner logs
-      if: always()
-      uses: actions/upload-artifact@v4
-      with:
-        name: cts-runner-logs
-        path: |
-          cts/results.csv
-
     - name: Verify tests
       run: ls cts | grep "results.csv";
 

build.zig

@@ -325,6 +325,7 @@ fn addMultithreadedCTS(b: *std.Build, target: std.Build.ResolvedTarget, impl: *c
     run.step.dependOn(&impl_lib.step);
 
     run.addArg("run");
+    run.addArg("--verbose");
     run.addArg("--deqp");
     run.addArg(cts_exe_path);
     run.addArg("--caselist");

src/soft/SoftDevice.zig

@@ -37,7 +37,7 @@ const SpawnError = std.Thread.SpawnError;
 
 const DeviceAllocator = struct {
     pub inline fn allocator(_: @This()) std.mem.Allocator {
-        return std.heap.smp_allocator;
+        return base.fallback_host_allocator;
     }
 };
 

src/vulkan/VulkanAllocator.zig

@@ -4,27 +4,21 @@
 const std = @import("std");
 const vk = @import("vulkan");
 
+const fallback_host_allocator = @import("fallback_host_allocator.zig").fallback_host_allocator;
+
 const Allocator = std.mem.Allocator;
 const Alignment = std.mem.Alignment;
 
 const Self = @This();
 
-const FallbackAllocator = struct {
-    pub inline fn allocator(_: @This()) std.mem.Allocator {
-        return std.heap.smp_allocator;
-    }
-};
-
 callbacks: ?vk.AllocationCallbacks,
 scope: vk.SystemAllocationScope,
-fallback_allocator: FallbackAllocator,
 
 pub fn init(callbacks: ?*const vk.AllocationCallbacks, scope: vk.SystemAllocationScope) Self {
     const deref_callbacks = if (callbacks) |c| c.* else null;
     return .{
         .callbacks = deref_callbacks,
         .scope = scope,
-        .fallback_allocator = .{},
     };
 }
 
@@ -53,7 +47,6 @@ pub fn cloneWithScope(self: *Self, scope: vk.SystemAllocationScope) Self {
     return .{
         .callbacks = self.callbacks,
         .scope = scope,
-        .fallback_allocator = self.fallback_allocator,
     };
 }
 
@@ -69,7 +62,7 @@ fn alloc(context: *anyopaque, len: usize, alignment: Alignment, ret_addr: usize)
         }
     }
 
-    return self.getFallbackAllocator().rawAlloc(len, alignment, ret_addr);
+    return fallback_host_allocator.rawAlloc(len, alignment, ret_addr);
 }
 
 fn resize(context: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize, ret_addr: usize) bool {
@@ -77,7 +70,7 @@ fn resize(context: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize,
     return if (self.callbacks != null)
         new_len <= ptr.len
     else
-        self.getFallbackAllocator().rawResize(ptr, alignment, new_len, ret_addr);
+        fallback_host_allocator.rawResize(ptr, alignment, new_len, ret_addr);
 }
 
 fn remap(context: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize, ret_addr: usize) ?[*]u8 {
@@ -87,7 +80,7 @@ fn remap(context: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize, r
             return @ptrCast(pfn_reallocation(self.callbacks.?.p_user_data, ptr.ptr, new_len, alignment.toByteUnits(), self.scope));
         }
     }
-    return self.getFallbackAllocator().rawRemap(ptr, alignment, new_len, ret_addr);
+    return fallback_host_allocator.rawRemap(ptr, alignment, new_len, ret_addr);
 }
 
 fn free(context: *anyopaque, ptr: []u8, alignment: Alignment, ret_addr: usize) void {
@@ -98,9 +91,5 @@ fn free(context: *anyopaque, ptr: []u8, alignment: Alignment, ret_addr: usize) v
             return;
         }
     }
-    self.getFallbackAllocator().rawFree(ptr, alignment, ret_addr);
+    fallback_host_allocator.rawFree(ptr, alignment, ret_addr);
-}
-
-inline fn getFallbackAllocator(self: *Self) std.mem.Allocator {
-    return self.fallback_allocator.allocator();
 }

src/vulkan/fallback_host_allocator.zig

@@ -0,0 +1,66 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+const Allocator = std.mem.Allocator;
+const Alignment = std.mem.Alignment;
+
+/// Atomic based spin mutex
+const AtomicMutex = struct {
+    mutex: std.atomic.Mutex = .unlocked,
+
+    fn lock(self: *@This()) void {
+        if (self.mutex.tryLock()) {
+            @branchHint(.likely);
+            return;
+        }
+
+        while (true) {
+            if (self.mutex.tryLock()) {
+                return;
+            }
+        }
+    }
+
+    fn unlock(self: *@This()) void {
+        self.mutex.unlock();
+    }
+};
+
+var mutex: AtomicMutex = .{};
+var child_allocator: std.mem.Allocator = if (builtin.link_libc) std.heap.c_allocator else std.heap.smp_allocator;
+
+pub const fallback_host_allocator: Allocator = .{
+    .ptr = undefined,
+    .vtable = &vtable,
+};
+
+const vtable: Allocator.VTable = .{
+    .alloc = alloc,
+    .resize = resize,
+    .remap = remap,
+    .free = free,
+};
+
+fn alloc(_: *anyopaque, len: usize, alignment: Alignment, ret_addr: usize) ?[*]u8 {
+    mutex.lock();
+    defer mutex.unlock();
+    return child_allocator.rawAlloc(len, alignment, ret_addr);
+}
+
+fn resize(_: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize, ret_addr: usize) bool {
+    mutex.lock();
+    defer mutex.unlock();
+    return child_allocator.rawResize(ptr, alignment, new_len, ret_addr);
+}
+
+fn remap(_: *anyopaque, ptr: []u8, alignment: Alignment, new_len: usize, ret_addr: usize) ?[*]u8 {
+    mutex.lock();
+    defer mutex.unlock();
+    return child_allocator.rawRemap(ptr, alignment, new_len, ret_addr);
+}
+
+fn free(_: *anyopaque, ptr: []u8, alignment: Alignment, ret_addr: usize) void {
+    mutex.lock();
+    defer mutex.unlock();
+    return child_allocator.rawFree(ptr, alignment, ret_addr);
+}

src/vulkan/lib.zig

@@ -14,6 +14,7 @@ pub const format = @import("format.zig");
 pub const config = @import("config");
 
 pub const Dispatchable = @import("Dispatchable.zig").Dispatchable;
+pub const fallback_host_allocator = @import("fallback_host_allocator.zig").fallback_host_allocator;
 pub const NonDispatchable = @import("NonDispatchable.zig").NonDispatchable;
 pub const VkError = errors.VkError;
 pub const VulkanAllocator = @import("VulkanAllocator.zig");