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[dev.typeparams] runtime: simplify defer record allocation

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Now that deferred functions are always argumentless and defer
records are no longer with arguments, defer record can be fixed
size (just the _defer struct). This allows us to simplify the
allocation of defer records, specifically, remove the defer
classes and the pools of different sized defers.

Change-Id: Icc4b16afc23b38262ca9dd1f7369ad40874cf701
Reviewed-on: https://go-review.googlesource.com/c/go/+/326062
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Cherry Mui 2021-06-08 18:45:18 -04:00
parent 4468e1cfb9
commit e0e9fb8aff
6 changed files with 50 additions and 142 deletions
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8
src/runtime/runtime2.go
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@ -613,8 +613,8 @@ type p struct {
pcache pageCache
raceprocctx uintptr
deferpool [5][]*_defer // pool of available defer structs of different sizes (see panic.go)
deferpoolbuf [5][32]*_defer
deferpool []*_defer // pool of available defer structs (see panic.go)
deferpoolbuf [32]*_defer
// Cache of goroutine ids, amortizes accesses to runtime·sched.goidgen.
goidcache uint64
@ -801,9 +801,9 @@ type schedt struct {
sudoglock mutex
sudogcache *sudog
// Central pool of available defer structs of different sizes.
// Central pool of available defer structs.
deferlock mutex
deferpool [5]*_defer
deferpool *_defer
// freem is the list of m's waiting to be freed when their
// m.exited is set. Linked through m.freelink.