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The "show activity" output mentions a number of indicators to explain wake up reasons but doesn't have the number of times poll() sees some I/O. And given that multiple events can happen simultaneously, it's not always possible to deduce this metric by subtracting. This patch adds a new "poll_io" counter that allows one to see how often poll() returns with at least one active FD. This should help detect stuck events and measure various ratios of poll sub-metrics. |
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