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| author | Juri Lelli <juri.lelli@redhat.com> | 2021-02-08 08:35:54 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-02-17 14:12:42 +0100 |
| commit | e0ee463c93c43b1657ad69cf2678ff5bf1b754fe (patch) | |
| tree | d2adb4faf2fd97e0df50a6ad64f6ab625343f13a /mm/mremap.c | |
| parent | 156ec6f42b8d300dbbf382738ff35c8bad8f4c3a (diff) | |
| download | linux-e0ee463c93c43b1657ad69cf2678ff5bf1b754fe.tar.gz | |
sched/features: Distinguish between NORMAL and DEADLINE hrtick
The HRTICK feature has traditionally been servicing configurations that need precise preemptions point for NORMAL tasks. More recently, the feature has been extended to also service DEADLINE tasks with stringent runtime enforcement needs (e.g., runtime < 1ms with HZ=1000). Enabling HRTICK sched feature currently enables the additional timer and task tick for both classes, which might introduced undesired overhead for no additional benefit if one needed it only for one of the cases. Separate HRTICK sched feature in two (and leave the traditional case name unmodified) so that it can be selectively enabled when needed. With: $ echo HRTICK > /sys/kernel/debug/sched_features the NORMAL/fair hrtick gets enabled. With: $ echo HRTICK_DL > /sys/kernel/debug/sched_features the DEADLINE hrtick gets enabled. Signed-off-by: Juri Lelli <juri.lelli@redhat.com> Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20210208073554.14629-3-juri.lelli@redhat.com
Diffstat (limited to 'mm/mremap.c')
0 files changed, 0 insertions, 0 deletions