timekeeping: Cache optimize struct timekeeper (3fdb14fd) · Commits · 戴 / test

include/linux/timekeeper_internal.h

+46 −38

Original line number	Diff line number	Diff line
		@@ -10,7 +10,22 @@
		#include <linux/jiffies.h>
		#include <linux/time.h>

		/* Structure holding internal timekeeping values. */
		/*
		* Structure holding internal timekeeping values.
		*
		* Note: wall_to_monotonic is what we need to add to xtime (or xtime
		* corrected for sub jiffie times) to get to monotonic time.
		* Monotonic is pegged at zero at system boot time, so
		* wall_to_monotonic will be negative, however, we will ALWAYS keep
		* the tv_nsec part positive so we can use the usual normalization.
		*
		* wall_to_monotonic is moved after resume from suspend for the
		* monotonic time not to jump. We need to add total_sleep_time to
		* wall_to_monotonic to get the real boot based time offset.
		*
		* - wall_to_monotonic is no longer the boot time, getboottime must be
		* used instead.
		*/
		struct timekeeper {
		/* Current clocksource used for timekeeping. */
		struct clocksource *clock;
		@@ -18,6 +33,29 @@ struct timekeeper {
		u32 mult;
		/* The shift value of the current clocksource. */
		u32 shift;
		/* Clock shifted nano seconds */
		u64 xtime_nsec;

		/* Current CLOCK_REALTIME time in seconds */
		u64 xtime_sec;
		/* CLOCK_REALTIME to CLOCK_MONOTONIC offset */
		struct timespec64 wall_to_monotonic;

		/* Offset clock monotonic -> clock realtime */
		ktime_t offs_real;
		/* Offset clock monotonic -> clock boottime */
		ktime_t offs_boot;
		/* Offset clock monotonic -> clock tai */
		ktime_t offs_tai;

		/* time spent in suspend */
		struct timespec64 total_sleep_time;
		/* The current UTC to TAI offset in seconds */
		s32 tai_offset;

		/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
		struct timespec64 raw_time;

		/* Number of clock cycles in one NTP interval. */
		cycle_t cycle_interval;
		/* Last cycle value (also stored in clock->cycle_last) */
		@@ -29,46 +67,16 @@ struct timekeeper {
		/* Raw nano seconds accumulated per NTP interval. */
		u32 raw_interval;

		/* Current CLOCK_REALTIME time in seconds */
		u64 xtime_sec;
		/* Clock shifted nano seconds */
		u64 xtime_nsec;

		/* Difference between accumulated time and NTP time in ntp
		* shifted nano seconds. */
		/*
		* Difference between accumulated time and NTP time in ntp
		* shifted nano seconds.
		*/
		s64 ntp_error;
		/* Shift conversion between clock shifted nano seconds and
		* ntp shifted nano seconds. */
		u32 ntp_error_shift;

		/*
		* wall_to_monotonic is what we need to add to xtime (or xtime corrected
		* for sub jiffie times) to get to monotonic time. Monotonic is pegged
		* at zero at system boot time, so wall_to_monotonic will be negative,
		* however, we will ALWAYS keep the tv_nsec part positive so we can use
		* the usual normalization.
		*
		* wall_to_monotonic is moved after resume from suspend for the
		* monotonic time not to jump. We need to add total_sleep_time to
		* wall_to_monotonic to get the real boot based time offset.
		*
		* - wall_to_monotonic is no longer the boot time, getboottime must be
		* used instead.
		* Shift conversion between clock shifted nano seconds and
		* ntp shifted nano seconds.
		*/
		struct timespec64 wall_to_monotonic;
		/* Offset clock monotonic -> clock realtime */
		ktime_t offs_real;
		/* time spent in suspend */
		struct timespec64 total_sleep_time;
		/* Offset clock monotonic -> clock boottime */
		ktime_t offs_boot;
		/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
		struct timespec64 raw_time;
		/* The current UTC to TAI offset in seconds */
		s32 tai_offset;
		/* Offset clock monotonic -> clock tai */
		ktime_t offs_tai;

		u32 ntp_error_shift;
		};

		#ifdef CONFIG_GENERIC_TIME_VSYSCALL

kernel/time/timekeeping.c

+97 −88

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