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runtime: avoid unnecessary scanblock calls

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This is the scanstack analog of CL 104737,
which made a similar change for copystack.

name         old time/op  new time/op  delta
ScanStack-8  41.1ms ± 6%  38.9ms ± 5%  -5.52%  (p=0.000 n=50+48)

Change-Id: I7427151dea2895ed3934f8a0f61d96b568019217
Reviewed-on: https://go-review.googlesource.com/105536
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Josh Bleecher Snyder 2018-04-06 21:45:55 -07:00
parent dda4591c8c
commit d91e9705f8
1 changed files with 8 additions and 4 deletions
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12
src/runtime/mgcmark.go
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@ -839,9 +839,11 @@ func scanframeworker(frame *stkframe, cache *pcvalueCache, gcw *gcWork) {
print("runtime: pcdata is ", pcdata, " and ", stkmap.n, " locals stack map entries for ", funcname(f), " (targetpc=", targetpc, ")\n")
throw("scanframe: bad symbol table")
}
bv := stackmapdata(stkmap, pcdata)
size = uintptr(bv.n) * sys.PtrSize
scanblock(frame.varp-size, size, bv.bytedata, gcw)
if stkmap.nbit > 0 {
bv := stackmapdata(stkmap, pcdata)
size = uintptr(bv.n) * sys.PtrSize
scanblock(frame.varp-size, size, bv.bytedata, gcw)
}
}
// Scan arguments.
@ -862,7 +864,9 @@ func scanframeworker(frame *stkframe, cache *pcvalueCache, gcw *gcWork) {
}
bv = stackmapdata(stkmap, pcdata)
}
scanblock(frame.argp, uintptr(bv.n)*sys.PtrSize, bv.bytedata, gcw)
if bv.n > 0 {
scanblock(frame.argp, uintptr(bv.n)*sys.PtrSize, bv.bytedata, gcw)
}
}
}