genirq/proc: Utilize irq_desc::tot_count to avoid evaluation

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Interrupts which are not marked per CPU increment not only the per CPU
statistics, but also the accumulation counter irq_desc::tot_count.

Change the counter to type unsigned long so it does not produce sporadic
zeros due to wrap arounds on 64-bit machines and do a quick check for non
per CPU interrupts. If the counter is zero, then simply emit a full set of
zero strings. That spares the evaluation of the per CPU counters completely
for interrupts with zero events.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Dmitry Ilvokhin <d@ilvokhin.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Link: https://patch.msgid.link/20260517194931.115522199@kernel.org

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Thomas Gleixner 2026-05-17 22:01:43 +02:00

parent 95c33a64f2

commit 0179464391

2 changed files with 13 additions and 4 deletions

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6

include/linux/irqdesc.h

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11

kernel/irq/proc.c

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