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| author |   Valentin Schneider <valentin.schneider@arm.com> | 2021-08-23 12:16:59 +0100 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-10-05 15:51:30 +0200 |
| commit | efd984c481abb516fab8bafb25bf41fd9397a43c (patch) | |
| tree | 456c643db81f5548a2d0395a234f5c5aee789db9 /kernel/sched/sched.h | |
| parent | Linux 5.15-rc4 (diff) | |
| download | linux-dev-efd984c481abb516fab8bafb25bf41fd9397a43c.tar.xz linux-dev-efd984c481abb516fab8bafb25bf41fd9397a43c.zip | |
sched/fair: Add NOHZ balancer flag for nohz.next_balance updates
A following patch will trigger NOHZ idle balances as a means to update
nohz.next_balance. Vincent noted that blocked load updates can have
non-negligible overhead, which should be avoided if the intent is to only
update nohz.next_balance.
Add a new NOHZ balance kick flag, NOHZ_NEXT_KICK. Gate NOHZ blocked load
update by the presence of NOHZ_STATS_KICK - currently all NOHZ balance
kicks will have the NOHZ_STATS_KICK flag set, so no change in behaviour is
expected.
Suggested-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210823111700.2842997-2-valentin.schneider@arm.com
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/sched.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 3d3e5793e117..1fec3132d57e 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2709,12 +2709,18 @@ extern void cfs_bandwidth_usage_dec(void); #define NOHZ_BALANCE_KICK_BIT 0 #define NOHZ_STATS_KICK_BIT 1 #define NOHZ_NEWILB_KICK_BIT 2 +#define NOHZ_NEXT_KICK_BIT 3 +/* Run rebalance_domains() */ #define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT) +/* Update blocked load */ #define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT) +/* Update blocked load when entering idle */ #define NOHZ_NEWILB_KICK BIT(NOHZ_NEWILB_KICK_BIT) +/* Update nohz.next_balance */ +#define NOHZ_NEXT_KICK BIT(NOHZ_NEXT_KICK_BIT) -#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK) +#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK | NOHZ_NEXT_KICK) #define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags) |