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A single update for the documentation of the base_slice_ns tunable to 

clarify that any value which is less than the tick slice has no effect
 because the scheduler tick is not guaranteed to happen within the set time
 slice.
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Merge tag 'sched-urgent-2024-03-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler doc clarification from Thomas Gleixner:
 "A single update for the documentation of the base_slice_ns tunable to
  clarify that any value which is less than the tick slice has no effect
  because the scheduler tick is not guaranteed to happen within the set
  time slice"

* tag 'sched-urgent-2024-03-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/doc: Update documentation for base_slice_ns and CONFIG_HZ relation
This commit is contained in:
Linus Torvalds 2024-03-24 11:11:05 -07:00
parent 864ad046c1 a26979377b
commit b136f68eb0
1 changed files with 3 additions and 0 deletions
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3
Documentation/scheduler/sched-design-CFS.rst
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@ -100,6 +100,9 @@ which can be used to tune the scheduler from "desktop" (i.e., low latencies) to
"server" (i.e., good batching) workloads. It defaults to a setting suitable
for desktop workloads. SCHED_BATCH is handled by the CFS scheduler module too.
In case CONFIG_HZ results in base_slice_ns < TICK_NSEC, the value of
base_slice_ns will have little to no impact on the workloads.
Due to its design, the CFS scheduler is not prone to any of the "attacks" that
exist today against the heuristics of the stock scheduler: fiftyp.c, thud.c,
chew.c, ring-test.c, massive_intr.c all work fine and do not impact