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runtime: only deduct assist credit for arenas during GC

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CL 617876 has changed the original behavior. This modification will restore it.

Change-Id: I72cce82ebed362f99da7548035435397c835c99b
GitHub-Last-Rev: 980ef25b43
GitHub-Pull-Request: golang/go#74705
Reviewed-on: https://go-review.googlesource.com/c/go/+/689436
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mark Freeman <mark@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
wingrez 2025-07-22 16:39:00 +00:00 • committed by Jorropo
parent 19a086f716
commit d79405a344
1 changed files with 3 additions and 1 deletions
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4
src/runtime/arena.go
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@ -745,7 +745,9 @@ func newUserArenaChunk() (unsafe.Pointer, *mspan) {
// does represent additional work for the GC, but we also have no idea
// what that looks like until we actually allocate things into the
// arena).
deductAssistCredit(userArenaChunkBytes)
if gcBlackenEnabled != 0 {
deductAssistCredit(userArenaChunkBytes)
}
// Set mp.mallocing to keep from being preempted by GC.
mp := acquirem()