Wakelist can help avoid cache bouncing and offload the overhead of waker
cpu. So far, using wakelist within the same llc only happens on
WF_ON_CPU, and this limitation could be removed to further improve
wakeup performance. The result of Unixbench Pipe-based Context Switching
can be improved up to ~10%.
v3:
Add a patch to fix the check of nr_running.
After that, we can remove WF_ON_CPU to achieve the same purpose.
Thank Valentin and Mel.
v2: https://lore.kernel.org/all/[email protected]/
Modify commit log to describe key point in detail.
Add more benchmark results on more archs.
v1: https://lore.kernel.org/all/[email protected]/
Tianchen Ding (2):
sched: Fix the check of nr_running at queue wakelist
sched: Remove the limitation of WF_ON_CPU on wakelist if wakee cpu is
idle
kernel/sched/core.c | 27 ++++++++++++++++-----------
kernel/sched/sched.h | 1 -
2 files changed, 16 insertions(+), 12 deletions(-)
--
2.27.0