2cdcb6f829
Currently the scavenger marks memory unused in multiples of the allocator page size (8K). This is safe as long as the true physical page size is 4K (or 8K), as it is on many platforms. However, on ARM64, PPC64x, and MIPS64, the physical page size is larger than 8K, so if we attempt to mark memory unused, the kernel will round the boundaries of the region *out* to all pages covered by the requested region, and we'll release a larger region of memory than intended. As a result, the scavenger is currently disabled on these platforms. Fix this by first rounding the region to be marked unused *in* to multiples of the physical page size, so that when we ask the kernel to mark it unused, it releases exactly the requested region. Fixes #9993. Change-Id: I96d5fdc2f77f9d69abadcea29bcfe55e68288cb1 Reviewed-on: https://go-review.googlesource.com/22066 Reviewed-by: Rick Hudson <rlh@golang.org> |
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