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runtime: use 4 MiB heap arenas on iOS

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iOS arm64 is a 64-bit platform but with a strictly 32-bit address space
(technically 33 bits, but the bottom half is unavailable to the
application). Since address space is limited, use 4 MiB arenas instead
of 64 MiB arenas. No changes are needed to the arena index because it's
still relatively small; this change just brings iOS more in line with
32-bit platforms.

Change-Id: I484e2d273d896fd0a57cd5c25012df0aef160290
Reviewed-on: https://go-review.googlesource.com/c/go/+/270538
Trust: Michael Knyszek <mknyszek@google.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Michael Anthony Knyszek 2020-11-16 22:03:17 +00:00 committed by Michael Knyszek
parent 5a8435d701
commit e03cca6407
1 changed files with 2 additions and 1 deletions
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3
src/runtime/malloc.go
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@ -227,6 +227,7 @@ const (
// -------------- --------- ---------- ---------- -----------
// */64-bit 48 64MB 1 4M (32MB)
// windows/64-bit 48 4MB 64 1M (8MB)
// ios/arm64 33 4MB 1 2048 (8KB)
// */32-bit 32 4MB 1 1024 (4KB)
// */mips(le) 31 4MB 1 512 (2KB)
@ -247,7 +248,7 @@ const (
// logHeapArenaBytes is log_2 of heapArenaBytes. For clarity,
// prefer using heapArenaBytes where possible (we need the
// constant to compute some other constants).
logHeapArenaBytes = (6+20)*(_64bit*(1-sys.GoosWindows)*(1-sys.GoarchWasm)) + (2+20)*(_64bit*sys.GoosWindows) + (2+20)*(1-_64bit) + (2+20)*sys.GoarchWasm
logHeapArenaBytes = (6+20)*(_64bit*(1-sys.GoosWindows)*(1-sys.GoarchWasm)*(1-sys.GoosIos*sys.GoarchArm64)) + (2+20)*(_64bit*sys.GoosWindows) + (2+20)*(1-_64bit) + (2+20)*sys.GoarchWasm + (2+20)*sys.GoosIos*sys.GoarchArm64
// heapArenaBitmapBytes is the size of each heap arena's bitmap.
heapArenaBitmapBytes = heapArenaBytes / (sys.PtrSize * 8 / 2)