timekeeping: Add percpu counter for tracking floor swap events

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The mgtime_floor value is a global variable for tracking the latest
fine-grained timestamp handed out. Because it's a global, track the
number of times that a new floor value is assigned.

Add a new percpu counter to the timekeeping code to track the number of
floor swap events that have occurred. A later patch will add a debugfs
file to display this counter alongside other stats involving multigrain
timestamps.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # documentation bits
Link: https://lore.kernel.org/all/20241002-mgtime-v10-2-d1c4717f5284@kernel.org

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Jeff Layton 2024-10-02 17:27:17 -04:00 • committed by Thomas Gleixner

parent 70c8fd00a9

commit 96f9a366ec

4 changed files with 30 additions and 0 deletions

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1

include/linux/timekeeping.h

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kernel/time/timekeeping.c

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kernel/time/timekeeping_debug.c

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kernel/time/timekeeping_internal.h

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