01baf13ba5
Currently, sysmon triggers a forced GC solely based on memstats.last_gc. However, memstats.last_gc isn't updated until mark termination, so once sysmon starts triggering forced GC, it will keep triggering them until GC finishes. The first of these actually starts a GC; the remainder up to the last print "GC forced", but gcStart returns immediately because gcphase != _GCoff; then the last may start another GC if the previous GC finishes (and sets last_gc) between sysmon triggering it and gcStart checking the GC phase. Fix this by expanding the condition for starting a forced GC to also require that no GC is currently running. This, combined with the way forcegchelper blocks until the GC cycle is started, ensures sysmon only starts one GC when the time exceeds the forced GC threshold. Fixes #13458. Change-Id: Ie6cf841927f6085136be3f45259956cd5cf10d23 Reviewed-on: https://go-review.googlesource.com/17819 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> |
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