Messages in this thread Patch in this message | | | Date | Thu, 12 Sep 2013 11:05:16 -0700 | From | tip-bot for Li Bin <> | Subject | [tip:sched/core] sched/Documentation: Update sched-design-CFS.txt documentation |
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Commit-ID: 3b524d60943a2f9ee1194323ff9d5ee01a4d1ce1 Gitweb: http://git.kernel.org/tip/3b524d60943a2f9ee1194323ff9d5ee01a4d1ce1 Author: Li Bin <huawei.libin@huawei.com> AuthorDate: Mon, 9 Sep 2013 14:05:40 +0800 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 12 Sep 2013 19:14:17 +0200
sched/Documentation: Update sched-design-CFS.txt documentation
2bd2d6f2dc ("sched: Replace use of entity_key()") had remove the entity_key() which function is to subtract a tasks vruntime by its groups minvruntime as the rbtree key. The phrase "there is a subtraction using rq->cfs.min_vruntime to account for possible wraparounds" in documentation feels strange and meaningless. So remove it.
Signed-off-by: Li Bin <huawei.libin@huawei.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1378706740-7500-1-git-send-email-huawei.libin@huawei.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- Documentation/scheduler/sched-design-CFS.txt | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/Documentation/scheduler/sched-design-CFS.txt b/Documentation/scheduler/sched-design-CFS.txt index d529e02d..f14f493 100644 --- a/Documentation/scheduler/sched-design-CFS.txt +++ b/Documentation/scheduler/sched-design-CFS.txt @@ -66,9 +66,7 @@ rq->cfs.load value, which is the sum of the weights of the tasks queued on the runqueue. CFS maintains a time-ordered rbtree, where all runnable tasks are sorted by the -p->se.vruntime key (there is a subtraction using rq->cfs.min_vruntime to -account for possible wraparounds). CFS picks the "leftmost" task from this -tree and sticks to it. +p->se.vruntime key. CFS picks the "leftmost" task from this tree and sticks to it. As the system progresses forwards, the executed tasks are put into the tree more and more to the right --- slowly but surely giving a chance for every task to become the "leftmost task" and thus get on the CPU within a deterministic
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