d69509ff99
Currently addrRange and addrRanges operate on real addresses. That is, the addresses they manipulate don't include arenaBaseOffset. When added to an address, arenaBaseOffset makes the address space appear contiguous on platforms where the address space is segmented. While this is generally OK because even those platforms which have a segmented address space usually don't give addresses in a different segment, today it causes a mismatch between the scavenger and the rest of the page allocator. The scavenger scavenges from the highest addresses first, but only via real address, whereas the page allocator allocates memory in offset address order. So this change makes addrRange and addrRanges, i.e. what the scavenger operates on, use offset addresses. However, lots of the page allocator relies on an addrRange containing real addresses. To make this transition less error-prone, this change introduces a new type, offAddr, whose purpose is to make offset addresses a distinct type, so any attempt to trivially mix real and offset addresses will trigger a compilation error. This change doesn't attempt to use offAddr in all of the runtime; a follow-up change will look for and catch remaining uses of an offset address which doesn't use the type. Updates #35788. Change-Id: I991d891ac8ace8339ca180daafdf6b261a4d43d1 Reviewed-on: https://go-review.googlesource.com/c/go/+/230717 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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