diff options
| author | Ionut Nechita (Sunlight Linux) <sunlightlinux@gmail.com> | 2026-01-28 09:45:43 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@kernel.org> | 2026-01-30 22:13:13 +0100 |
| commit | 56534673cea7f00d96a64deb58057298fe9f192e (patch) | |
| tree | 7daba94d20a9d26ceb7166944a30dce49673a718 | |
| parent | 3db5306b0bd562ac0fe7eddad26c60ebb6f5fdd4 (diff) | |
tick/nohz: Optimize check_tick_dependency() with early return
There is no point in iterating through individual tick dependency bits when
the tick_stop tracepoint is disabled, which is the common case.
When the trace point is disabled, return immediately based on the atomic
value being zero or non-zero, skipping the per-bit evaluation.
This optimization improves the hot path performance of tick dependency
checks across all contexts (idle and non-idle), not just nohz_full CPUs.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ionut Nechita (Sunlight Linux) <sunlightlinux@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260128074558.15433-3-sunlightlinux@gmail.com
| -rw-r--r-- | kernel/time/tick-sched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 8ddf74e705d3..fd928d374cfc 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -344,6 +344,9 @@ static bool check_tick_dependency(atomic_t *dep) { int val = atomic_read(dep); + if (likely(!tracepoint_enabled(tick_stop))) + return !val; + if (val & TICK_DEP_MASK_POSIX_TIMER) { trace_tick_stop(0, TICK_DEP_MASK_POSIX_TIMER); return true; |