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bfd3749d48
linux/kernel/sched
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Tejun Heo bfd3749d48 sched_ext: Use shorter slice in bypass mode 
There have been reported cases of bypass mode not making forward progress fast
enough. The 20ms default slice is unnecessarily long for bypass mode where the
primary goal is ensuring all tasks can make forward progress.

Introduce SCX_SLICE_BYPASS set to 5ms and make the scheduler automatically
switch to it when entering bypass mode. Also make the bypass slice value
tunable through the slice_bypass_us module parameter (adjustable between 100us
and 100ms) to make it easier to test whether slice durations are a factor in
problem cases.

v3: Use READ_ONCE/WRITE_ONCE for scx_slice_dfl access (Dan).

v2: Removed slice_dfl_us module parameter. Fixed typos (Andrea).

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Cc: Dan Schatzberg <schatzberg.dan@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2025-11-12 06:43:43 -10:00
..
autogroup.c cgroup: Rename cgroup lifecycle hooks to cgroup_task_*() 2025-11-03 11:46:18 -10:00
autogroup.h sched: Clean up and standardize #if/#else/#endif markers in sched/autogroup.[ch] 2025-06-13 08:47:14 +02:00
build_policy.c sched_ext: Move internal type and accessor definitions to ext_internal.h 2025-09-03 11:33:28 -10:00
build_utility.c sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
clock.c sched: Clean up and standardize #if/#else/#endif markers in sched/clock.c 2025-06-13 08:47:14 +02:00
completion.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core_sched.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core.c sched_ext: Fix cgroup exit ordering by moving sched_ext_free() to finish_task_switch() 2025-11-03 11:57:30 -10:00
cpuacct.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpudeadline.c sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpudeadline.h sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpufreq_schedutil.c sched: Clean up and standardize #if/#else/#endif markers in sched/cpufreq_schedutil.c 2025-06-13 08:47:15 +02:00
cpufreq.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpupri.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpupri.h sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
cputime.c sched: Clean up and standardize #if/#else/#endif markers in sched/cputime.c 2025-06-13 08:47:15 +02:00
deadline.c sched_ext: Merge branch 'for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup into for-6.19 2025-11-03 11:57:26 -10:00
debug.c sched/deadline: Always stop dl-server before changing parameters 2025-08-26 10:46:00 +02:00
ext_idle.c sched_ext: Wrap kfunc args in struct to prepare for aux__prog 2025-10-13 08:49:29 -10:00
ext_idle.h sched_ext: Always use SMP versions in kernel/sched/ext_idle.h 2025-06-13 14:47:59 -10:00
ext_internal.h sched_ext: Mark racy bitfields to prevent adding fields that can't tolerate races 2025-11-05 12:07:09 -10:00
ext.c sched_ext: Use shorter slice in bypass mode 2025-11-12 06:43:43 -10:00
ext.h sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations 2025-09-03 11:36:07 -10:00
fair.c sched_ext: Merge branch 'for-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup into for-6.19 2025-11-03 11:57:26 -10:00
features.h sched/fair: Untangle NEXT_BUDDY and pick_next_task() 2024-12-09 11:48:13 +01:00
idle.c sched: Add support to pick functions to take rf 2025-10-16 11:13:55 +02:00
isolation.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
loadavg.c Merge branch 'tip/sched/urgent' 2025-07-14 17:16:28 +02:00
Makefile tracing: Disable branch profiling in noinstr code 2025-03-22 09:49:26 +01:00
membarrier.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
pelt.c sched: Clean up and standardize #if/#else/#endif markers in sched/pelt.[ch] 2025-06-13 08:47:17 +02:00
pelt.h sched/fair: Switch to task based throttle model 2025-09-03 10:03:14 +02:00
psi.c sched/psi: Fix psi_seq initialization 2025-08-04 10:51:22 -07:00
rq-offsets.c sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
rt.c sched: Add support to pick functions to take rf 2025-10-16 11:13:55 +02:00
sched-pelt.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
sched.h sched_ext: Allow scx_bpf_reenqueue_local() to be called from anywhere 2025-10-29 05:29:04 -10:00
smp.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
stats.c sched/smp: Use the SMP version of schedstats 2025-06-13 08:47:21 +02:00
stats.h sched: Match __task_rq_{,un}lock() 2025-10-16 11:13:54 +02:00
stop_task.c sched: Add support to pick functions to take rf 2025-10-16 11:13:55 +02:00
swait.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
syscalls.c sched: Cleanup the sched_change NOCLOCK usage 2025-10-16 11:13:54 +02:00
topology.c sched: Create architecture specific sched domain distances 2025-10-16 11:13:49 +02:00
wait_bit.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
wait.c ARM: 2025-07-30 17:14:01 -07:00