4f188c2d1c
Currently it's possible to perform GC work on a system stack or when locks are held if there's an allocation that triggers an assist. This is generally a bad idea because of the fragility of these contexts, and it's incompatible with two changes we're about to make: one is to yield after signaling mark completion (which we can't do from a non-preemptible context) and the other is to make assists block if there's no other way for them to pay off the assist debt. This commit simply skips the assist if it's called from a non-preemptible context. The allocation will still count toward the assist debt, so it will be paid off by a later assist. There should be little allocation from non-preemptible contexts, so this shouldn't harm the overall assist mechanism. Change-Id: I7bf0e6c73e659fe6b52f27437abf39d76b245c79 Reviewed-on: https://go-review.googlesource.com/12649 Reviewed-by: Russ Cox <rsc@golang.org> |
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