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runtime: disable huge pages for GC metadata for small heaps

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For #55328.

Change-Id: I8792161f09906c08d506cc0ace9d07e76ec6baa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/460316
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Anthony Knyszek 2023-01-03 17:59:48 +00:00 • committed by Michael Knyszek
parent 8c2ff88c61
commit 1f9d80e331
4 changed files with 130 additions and 1 deletions
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4
src/runtime/mheap.go
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@ -144,6 +144,10 @@ type mheap struct {
// will never be nil.
arenas [1 << arenaL1Bits]*[1 << arenaL2Bits]*heapArena
// arenasHugePages indicates whether arenas' L2 entries are eligible
// to be backed by huge pages.
arenasHugePages bool
// heapArenaAlloc is pre-reserved space for allocating heapArena
// objects. This is only used on 32-bit, where we pre-reserve
// this space to avoid interleaving it with the heap itself.