| commit | a41ebe6e259af020d4ce7029544439b39d07936b | [log] [tgz] |
|---|---|---|
| author | Michael Anthony Knyszek <mknyszek@google.com> | Tue Jul 16 20:36:33 2019 +0000 |
| committer | Austin Clements <austin@google.com> | Tue Jul 30 18:44:52 2019 +0000 |
| tree | fe706075c4932e316580356f9260348b4afdb4dc | |
| parent | fbb819ebc443518e9caea3c1b0d0f9e0efec2262 [diff] |
runtime: add physHugePageShift 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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