OpenJDK / jdk / jdk
changeset 54017:274361bd6915
8220228: Improve Shenandoah pacing histogram message
Reviewed-by: rkennke
| author | shade |
|---|---|
| date | Thu, 07 Mar 2019 10:22:19 +0100 |
| parents | a7cccbdf73f3 |
| children | 0f9a54a13803 |
| files | src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp |
| diffstat | 1 files changed, 5 insertions(+), 0 deletions(-) [+] |
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--- a/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp Wed Mar 06 16:01:01 2019 +0100 +++ b/src/hotspot/share/gc/shenandoah/shenandoahPacer.cpp Thu Mar 07 10:22:19 2019 +0100 @@ -299,4 +299,9 @@ } out->print_cr("%23s: " SIZE_FORMAT_W(12) SIZE_FORMAT_W(12) " ms", "Total", total_count, total_sum); out->cr(); + out->print_cr("Pacing delays are measured from entering the pacing code till exiting it. Therefore,"); + out->print_cr("observed pacing delays may be higher than the threshold when paced thread spent more"); + out->print_cr("time in the pacing code. It usually happens when thread is de-scheduled while paced,"); + out->print_cr("OS takes longer to unblock the thread, or JVM experiences an STW pause."); + out->cr(); }