29e9c4d4a4
Currently the heap bitamp is laid in reverse order in memory relative to the heap itself. This was originally done out of "excessive cleverness" so that computing a bitmap pointer could load only the arena_start field and so that heaps could be more contiguous by growing the arena and the bitmap out from a common center point. However, this appears to have no actual performance benefit, it complicates nearly every use of the bitmap, and it makes already confusing code more confusing. Furthermore, it's still possible to use a single field (the new bitmap_delta) for the bitmap pointer computation by employing slightly different excessive cleverness. Hence, this CL puts the bitmap into forward order. This is a (very) updated version of CL 9404. Change-Id: I743587cc626c4ecd81e660658bad85b54584108c Reviewed-on: https://go-review.googlesource.com/85881 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> |
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