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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-24 11:11:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-24 11:11:05 -0700
commitb136f68eb00d898e8f5549d86cc87e8a9e4185f2 (patch)
treeea9281c8f1bd3c277809d4a732b72b2b609e9a02
parent864ad046c15758747809d9397cae621540493bcb (diff)
parenta26979377bf34534ce5ee2712d2a46157ec61498 (diff)
downloadlwn-b136f68eb00d898e8f5549d86cc87e8a9e4185f2.tar.gz
lwn-b136f68eb00d898e8f5549d86cc87e8a9e4185f2.zip
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
-rw-r--r--Documentation/scheduler/sched-design-CFS.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/scheduler/sched-design-CFS.rst b/Documentation/scheduler/sched-design-CFS.rst
index 6cffffe26500..e030876fbd68 100644
--- a/Documentation/scheduler/sched-design-CFS.rst
+++ b/Documentation/scheduler/sched-design-CFS.rst
@@ -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