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runtime: add per-p page allocation cache

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This change adds a per-p free page cache which the page allocator may
allocate out of without a lock. The change also introduces a completely
lockless page allocator fast path.

Although the cache contains at most 64 pages (and usually less), the
vast majority (85%+) of page allocations are exactly 1 page in size.

Updates #35112.

Change-Id: I170bf0a9375873e7e3230845eb1df7e5cf741b78
Reviewed-on: https://go-review.googlesource.com/c/go/+/195701
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Michael Anthony Knyszek 2019-09-16 21:23:24 +00:00 • committed by Michael Knyszek
parent 81640ea38d
commit a2cd2bd55d
5 changed files with 86 additions and 20 deletions
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3
src/runtime/runtime2.go
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@ -555,6 +555,7 @@ type p struct {
sysmontick sysmontick // last tick observed by sysmon
m muintptr // back-link to associated m (nil if idle)
mcache *mcache
pcache pageCache
raceprocctx uintptr
deferpool [5][]*_defer // pool of available defer structs of different sizes (see panic.go)
@ -611,7 +612,7 @@ type p struct {
palloc persistentAlloc // per-P to avoid mutex
// _ uint32 // Alignment for atomic fields below
_ uint32 // Alignment for atomic fields below
// Per-P GC state
gcAssistTime int64 // Nanoseconds in assistAlloc