a41ebe6e25
This change adds physHugePageShift which is defined such that 1 << physHugePageShift == physHugePageSize. The purpose of this variable is to avoid doing expensive divisions in key functions, such as (*mspan).hugePages. This change also does a sweep of any place we might do a division or mod operation with physHugePageSize and turns it into bit shifts and other bitwise operations. Finally, this change adds a check to mallocinit which ensures that physHugePageSize is always a power of two. osinit might choose to ignore non-powers-of-two for the value and replace it with zero, but mallocinit will fail if it's not a power of two (or zero). It also derives physHugePageShift from physHugePageSize. This change helps improve the performance of most applications because of how often (*mspan).hugePages is called. Updates #32828. Change-Id: I1a6db113d52d563f59ae8fd4f0e130858859e68f Reviewed-on: https://go-review.googlesource.com/c/go/+/186598 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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