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[dev.link] cmd/link: parallelize ELF relocation writing

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Now that we write ELF relocation records in mapped memory with
known sizes and offsets, we can write them in parallel.

Further speed up Asmb2 pass. Linking cmd/compile with external
linking,

Asmb2        141ms ± 4%      97ms ± 5%  -30.98%  (p=0.000 n=10+9)

Change-Id: I52c2b9230e90ed4421c21d7ef13a4f1e996f6054
Reviewed-on: https://go-review.googlesource.com/c/go/+/240400
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Cherry Zhang 2020-06-26 19:17:33 -04:00
parent 987ce93824
commit 36939aef77
11 changed files with 169 additions and 140 deletions
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2
src/cmd/link/internal/ld/lib.go
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@ -236,7 +236,7 @@ type Arch struct {
Asmb func(*Link, *loader.Loader)
Asmb2 func(*Link, *loader.Loader)
Elfreloc1 func(*Link, *loader.Loader, loader.Sym, loader.ExtRelocView, int64) bool
Elfreloc1 func(*Link, *OutBuf, *loader.Loader, loader.Sym, loader.ExtRelocView, int64) bool
ElfrelocSize uint32 // size of an ELF relocation record, must match Elfreloc1. Currently this can be 0, meaning that the size is not fixed (a Go reloc may turn into multiple ELF reloc).
Elfsetupplt func(ctxt *Link, plt, gotplt *loader.SymbolBuilder, dynamic loader.Sym)
Gentext func(*Link, *loader.Loader)