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Note that tasks that are kept on the runqueue to burn off negative lag, are not in fact runnable anymore, they'll get dequeued the moment they get picked. As such, don't count this time towards runnable. Thanks to Valentin for spotting I had this backwards initially. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <vschneid@redhat.com> Tested-by: Valentin Schneider <vschneid@redhat.com> Link: https://lkml.kernel.org/r/20240727105030.514088302@infradead.org