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
- Li Yu
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