diff options
| author | Anna-Maria Behnsen <anna-maria@linutronix.de> | 2025-03-03 12:11:20 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-03-08 14:37:41 +0100 |
| commit | 97a5a90ca234eaa3de8a6aa44d43de2827393019 (patch) | |
| tree | ea5064a1a52134589f8159cab9fbd00418893242 | |
| parent | ed0c10f34ffd94d6e0d37b830c232f7ca38ea174 (diff) | |
vdso: Move architecture related data before basetime data
Architecture related vdso data is required in the fast path when reading
CLOCK_MONOTONIC or CLOCK_REALTIME. At the moment, this information is
located at the end of the vdso_time_data structure, which is a suboptimal
cache layout.
Move the architecture specific VDSO data right before the basetime
information, which is always required. This change does not have an impact
on architectures with CONFIG_ARCH_HAS_VDSO_DATA=n. Architectures, which
have it enabled, gain a better cache layout.
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-18-c1b5c69a166f@linutronix.de
| -rw-r--r-- | include/vdso/datapage.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h index 1df22e8bb9b3..bcd19c223783 100644 --- a/include/vdso/datapage.h +++ b/include/vdso/datapage.h @@ -70,6 +70,8 @@ struct vdso_timestamp { /** * struct vdso_time_data - vdso datapage representation + * @arch_data: architecture specific data (optional, defaults + * to an empty struct) * @seq: timebase sequence counter * @clock_mode: clock mode * @cycle_last: timebase at clocksource init @@ -83,8 +85,6 @@ struct vdso_timestamp { * @tz_dsttime: type of DST correction * @hrtimer_res: hrtimer resolution * @__unused: unused - * @arch_data: architecture specific data (optional, defaults - * to an empty struct) * * vdso_time_data will be accessed by 64 bit and compat code at the same time * so we should be careful before modifying this structure. @@ -105,6 +105,8 @@ struct vdso_timestamp { * offset must be zero. */ struct vdso_time_data { + struct arch_vdso_time_data arch_data; + u32 seq; s32 clock_mode; @@ -125,8 +127,6 @@ struct vdso_time_data { s32 tz_dsttime; u32 hrtimer_res; u32 __unused; - - struct arch_vdso_time_data arch_data; } ____cacheline_aligned; #define vdso_clock vdso_time_data |