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std.heap.GeneralPurposeAllocator: runtime-known page size

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no longer causes compilation failure.

This also addresses the problem of high map count causing OOM by
choosing a page size of 2MiB for most targets when the page_size_max is
smaller than this number.
This commit is contained in:
Andrew Kelley 2025-01-30 18:25:01 -08:00
parent b23662feeb
commit dd2fa4f75d
1 changed files with 5 additions and 1 deletions
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lib/std/heap/general_purpose_allocator.zig
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@ -99,7 +99,11 @@ const math = std.math;
const assert = std.debug.assert;
const mem = std.mem;
const Allocator = std.mem.Allocator;
const page_size = std.heap.pageSize(); // TODO: allow this to be runtime known
const page_size: 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 => 2 * 1024 * 1024, // Avoids too many active mappings when `page_size_max` is low.
});
const StackTrace = std.builtin.StackTrace;
/// Integer type for pointing to slots in a small allocation