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runtime: ensure at least 1 tick between events

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ticks might be same after tick division, although the real cputicks
is linear growth

Fixes #46737

Change-Id: I1d98866fbf21b426c6c1c96cc9cf802d7f440f18
Reviewed-on: https://go-review.googlesource.com/c/go/+/330849
Trust: Meng Zhuo <mzh@golangcn.org>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Meng Zhuo 2021-09-20 20:44:50 +08:00
parent 8838a3b53f
commit ee92daae25
1 changed files with 10 additions and 0 deletions
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10
src/runtime/trace.go
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@ -551,8 +551,15 @@ func traceEventLocked(extraBytes int, mp *m, pid int32, bufp *traceBufPtr, ev by
bufp.set(buf)
}
// NOTE: ticks might be same after tick division, although the real cputicks is
// linear growth.
ticks := uint64(cputicks()) / traceTickDiv
tickDiff := ticks - buf.lastTicks
if tickDiff == 0 {
ticks = buf.lastTicks + 1
tickDiff = 1
}
buf.lastTicks = ticks
narg := byte(len(args))
if skip >= 0 {
@ -653,6 +660,9 @@ func traceFlush(buf traceBufPtr, pid int32) traceBufPtr {
// initialize the buffer for a new batch
ticks := uint64(cputicks()) / traceTickDiv
if ticks == bufp.lastTicks {
ticks = bufp.lastTicks + 1
}
bufp.lastTicks = ticks
bufp.byte(traceEvBatch | 1<<traceArgCountShift)
bufp.varint(uint64(pid))