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std.heap.SmpAllocator: 256K slab_len

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and no need for special handling of wasi and windows since we don't ask
for anything more than page-aligned.
This commit is contained in:
Andrew Kelley 2025-02-06 17:35:27 -08:00
parent 3d7c5cf64a
commit 84bf7a6701
1 changed files with 1 additions and 6 deletions
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7
lib/std/heap/SmpAllocator.zig
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@ -30,7 +30,6 @@
//! through the full set of freelists.
const builtin = @import("builtin");
const native_os = builtin.os.tag;
const std = @import("../std.zig");
const assert = std.debug.assert;
@ -56,11 +55,7 @@ var global: SmpAllocator = .{
threadlocal var thread_id: Thread.Id = .none;
const max_thread_count = 128;
const slab_len: usize = @max(std.heap.page_size_max, switch (builtin.os.tag) {
.windows => 64 * 1024, // Makes `std.heap.PageAllocator` take the happy path.
.wasi => 64 * 1024, // Max alignment supported by `std.heap.WasmAllocator`.
else => 256 * 1024, // Avoids too many active mappings when `page_size_max` is low.
});
const slab_len: usize = @max(std.heap.page_size_max, 256 * 1024);
/// Because of storing free list pointers, the minimum size class is 3.
const min_class = math.log2(math.ceilPowerOfTwoAssert(usize, 1 + @sizeOf(usize)));
const size_class_count = math.log2(slab_len) - min_class;