| author |  Andrew Kelley <andrew@ziglang.org> 2025-01-30 18:25:01-08:00 |
| committer | Andrew Kelley <andrew@ziglang.org> 2025-02-06 14:23:23-08:00 |
| log | dd2fa4f75d3d2b1214fde22081f0b88850d1b55d |
| tree | 272d7d23a6f4bd7627adbbdc6145b3cb8010c89d |
| parent | b23662feeb0ecea67eefbcfe941e609c5a8ca842 |
std.heap.GeneralPurposeAllocator: runtime-known page size
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.1 files changed, 5 insertions(+), 1 deletions(-)
lib
lib/std/heap/general_purpose_allocator.zig+5-1
| ... | ... | @@ -99,7 +99,11 @@ const math = std.math; |
| 99 | 99 | const assert = std.debug.assert; |
| 100 | 100 | const mem = std.mem; |
| 101 | 101 | const Allocator = std.mem.Allocator; |
| 102 | const page_size = std.heap.pageSize(); // TODO: allow this to be runtime known | |
| 102 | const page_size: usize = @max(std.heap.page_size_max, switch (builtin.os.tag) { | |
| 103 | .windows => 64 * 1024, // Makes `std.heap.PageAllocator` take the happy path. | |
| 104 | .wasi => 64 * 1024, // Max alignment supported by `std.heap.WasmAllocator`. | |
| 105 | else => 2 * 1024 * 1024, // Avoids too many active mappings when `page_size_max` is low. | |
| 106 | }); | |
| 103 | 107 | const StackTrace = std.builtin.StackTrace; |
| 104 | 108 | |
| 105 | 109 | /// Integer type for pointing to slots in a small allocation |