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runtime: support runtime.freegc in size-specialized mallocs for noscan objects

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This CL is part of a set of CLs that attempt to reduce how much work the
GC must do. See the design in https://go.dev/design/74299-runtime-freegc

This CL updates the smallNoScanStub stub in malloc_stubs.go to reuse
heap objects that have been freed by runtime.freegc calls, and generates
the corresponding size-specialized code in malloc_generated.go.

This CL only adds support in the specialized mallocs for noscan
heap objects (objects without pointers). A later CL handles objects
with pointers.

While we are here, we leave a couple of breadcrumbs in mkmalloc.go on
how to do the generation.

Updates #74299

Change-Id: I2657622601a27211554ee862fce057e101767a70
Reviewed-on: https://go-review.googlesource.com/c/go/+/715761
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
thepudds 2025-11-09 09:24:22 -05:00 • committed by t hepudds
parent c3708350a4
commit 50128a2154
5 changed files with 693 additions and 10 deletions
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3
src/runtime/_mkmalloc/mkmalloc.go
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@ -254,7 +254,8 @@ func inline(config generatorConfig) []byte {
}
// Write out the package and import declarations.
out.WriteString("// Code generated by mkmalloc.go; DO NOT EDIT.\n\n")
out.WriteString("// Code generated by mkmalloc.go; DO NOT EDIT.\n")
out.WriteString("// See overview in malloc_stubs.go.\n\n")
out.WriteString("package " + f.Name.Name + "\n\n")
for _, importDecl := range importDecls {
out.Write(mustFormatNode(fset, importDecl))