a120cc8b36
This change adds the allocNeedZero method to mheap which uses the new heapArena field zeroedBase to determine whether a new allocation needs zeroing. The purpose of this work is to avoid zeroing memory that is fresh from the OS in the context of the new allocator, where we no longer have the concept of a free span to track this information. The new field in heapArena, zeroedBase, is small, which runs counter to the advice in the doc comment for heapArena. Since heapArenas are already not a multiple of the system page size, this advice seems stale, and we're OK with using an extra physical page for a heapArena. So, this change also deletes the comment with that advice. Updates #35112. Change-Id: I688cd9fd3c57a98a6d43c45cf699543ce16697e2 Reviewed-on: https://go-review.googlesource.com/c/go/+/203858 Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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