diff options
| author | Thomas Gleixner <tglx@kernel.org> | 2026-02-24 17:38:28 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-02-27 16:40:14 +0100 |
| commit | eddffab8282e388dddf032f3295fcec87eb08095 (patch) | |
| tree | e90eefaeb90373f178d265a2ce7b4d52734c3e2b /include/linux | |
| parent | b95c4442b02162904e9012e670b602ebeb3c6c1b (diff) | |
hrtimer: Keep track of first expiring timer per clock base
Evaluating the next expiry time of all clock bases is cache line expensive
as the expiry time of the first expiring timer is not cached in the base
and requires to access the timer itself, which is definitely in a different
cache line.
It's way more efficient to keep track of the expiry time on enqueue and
dequeue operations as the relevant data is already in the cache at that
point.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163431.404839710@kernel.org
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hrtimer_defs.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/hrtimer_defs.h b/include/linux/hrtimer_defs.h index b6846efec210..fb38df4c0b64 100644 --- a/include/linux/hrtimer_defs.h +++ b/include/linux/hrtimer_defs.h @@ -19,6 +19,7 @@ * timer to a base on another cpu. * @clockid: clock id for per_cpu support * @seq: seqcount around __run_hrtimer + * @expires_next: Absolute time of the next event in this clock base * @running: pointer to the currently running hrtimer * @active: red black tree root node for the active timers * @offset: offset of this clock to the monotonic base @@ -28,6 +29,7 @@ struct hrtimer_clock_base { unsigned int index; clockid_t clockid; seqcount_raw_spinlock_t seq; + ktime_t expires_next; struct hrtimer *running; struct timerqueue_head active; ktime_t offset; |