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This change modifies mheap's span allocation API to have each caller declare a purpose, defined as a new enum called spanAllocType. The purpose behind this change is two-fold: 1. Tight control over who gets to allocate heap memory is, generally speaking, a good thing. Every codepath that allocates heap memory places additional implicit restrictions on the allocator. A notable example of a restriction is work bufs coming from heap memory: write barriers are not allowed in allocation paths because then we could have a situation where the allocator calls into the allocator. 2. Memory statistic updating is explicit. Instead of passing an opaque pointer for statistic updating, which places restrictions on how that statistic may be updated, we use the spanAllocType to determine which statistic to update and how. We also take this opportunity to group all the statistic updating code together, which should make the accounting code a little easier to follow. Change-Id: Ic0b0898959ba2a776f67122f0e36c9d7d60e3085 Reviewed-on: https://go-review.googlesource.com/c/go/+/246970 Trust: Michael Knyszek <mknyszek@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> |
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README.md
The Go Programming Language
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