diff options
| author |   Will Deacon <will@kernel.org> | 2021-05-24 23:18:16 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2021-05-31 17:04:45 +0200 |
| commit | c94a8537df12708cc03da9120c3c3561ae744ce1 (patch) | |
| tree | a3d59a3f9da19632708e5bdf3a29d2e0729ab4be /kernel/time/tick-common.c | |
| parent | tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper (diff) | |
| download | linux-dev-c94a8537df12708cc03da9120c3c3561ae744ce1.tar.xz linux-dev-c94a8537df12708cc03da9120c3c3561ae744ce1.zip | |
tick/broadcast: Prefer per-cpu oneshot wakeup timers to broadcast
Some SoCs have two per-cpu timer implementations where the timer with the
higher rating stops in deep idle (i.e. suffers from CLOCK_EVT_FEAT_C3STOP)
but is otherwise preferable to the timer with the lower rating. In such a
design, selecting the higher rated devices relies on a global broadcast
timer and IPIs to wake up from deep idle states.
To avoid the reliance on a global broadcast timer and also to reduce the
overhead associated with the IPI wakeups, extend
tick_install_broadcast_device() to manage per-cpu wakeup timers separately
from the broadcast device.
For now, these timers remain unused.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210524221818.15850-4-will@kernel.org
Diffstat (limited to 'kernel/time/tick-common.c')
| -rw-r--r-- | kernel/time/tick-common.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index e15bc0ef1912..d663249652ef 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -373,7 +373,7 @@ out_bc: /* * Can the new device be used as a broadcast device ? */ - tick_install_broadcast_device(newdev); + tick_install_broadcast_device(newdev, cpu); } /** |