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| author | Li Bin <huawei.libin@huawei.com> | 2013-09-09 14:05:40 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-09-12 19:14:17 +0200 |
| commit | 3b524d60943a2f9ee1194323ff9d5ee01a4d1ce1 (patch) | |
| tree | 542dd1c5f0ec27c572060aee449903d57cb9d5e9 /Documentation/scheduler | |
| parent | fc840914e9b07ab4685c195e1e54e58de4f84c03 (diff) | |
| download | lwn-3b524d60943a2f9ee1194323ff9d5ee01a4d1ce1.tar.gz lwn-3b524d60943a2f9ee1194323ff9d5ee01a4d1ce1.zip | |
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>
Diffstat (limited to 'Documentation/scheduler')
| -rw-r--r-- | Documentation/scheduler/sched-design-CFS.txt | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/Documentation/scheduler/sched-design-CFS.txt b/Documentation/scheduler/sched-design-CFS.txt index d529e02d928d..f14f49304222 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 |