Messages in this thread | | | Date | Mon, 28 May 2007 09:17:24 +0800 | From | Li Yu <> | Subject | Re: [patch] CFS scheduler, -v14 |
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Ingo Molnar wrote: > i'm pleased to announce release -v14 of the CFS scheduler patchset. > > The CFS patch against v2.6.22-rc2, v2.6.21.1 or v2.6.20.10 can be > downloaded from the usual place: > > http://people.redhat.com/mingo/cfs-scheduler/ >
In comment before distribute_fair_add(), we have such text:
/* * A task gets added back to the runnable tasks and gets * a small credit for the CPU time it missed out on while * it slept, so fix up all other runnable task's wait_runtime * so that the sum stays constant (around 0). * [snip] */
But as I observe by cat /proc/sched_debug (2.6.21.1, UP, RHEL4), I found the all waiting fields often are more than zero, or less than zero.
IMHO, the sum of task_struct->wait_runtime just is the denominator of all runnable time in some ways, is it right? if so, increasing the sum of wait_runtime just make scheduling decision more precise. so what's meaning for keeping the wait_runtime is zero-sum?
Good luck
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