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Austin Clements authored
Currently, when the mutator allocates, the runtime first allocates the memory and then, if that G has done "enough" allocation, the runtime checks whether the G has assist debt to pay off and, if so, pays it off. This approach leads to under-assisting, where a G can allocate a large region (or many small regions) before paying for it, or can even exit with outstanding debt. This commit flips this around so that a G always acquires enough credit for an allocation before it can perform that allocation. We continue to amortize the cost of assists by requiring that they over-assist when triggered to build up credit for many allocations. Fixes #11967. Change-Id: Idac9f11133b328535667674d837be72c23ebd899 Reviewed-on: https://go-review.googlesource.com/15409Reviewed-by: Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com>
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