From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- drivers/md/dm-io-tracker.h | 82 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 drivers/md/dm-io-tracker.h (limited to 'drivers/md/dm-io-tracker.h') diff --git a/drivers/md/dm-io-tracker.h b/drivers/md/dm-io-tracker.h new file mode 100644 index 000000000..bea1ca118 --- /dev/null +++ b/drivers/md/dm-io-tracker.h @@ -0,0 +1,82 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2021 Red Hat, Inc. All rights reserved. + * + * This file is released under the GPL. + */ + +#ifndef DM_IO_TRACKER_H +#define DM_IO_TRACKER_H + +#include + +struct dm_io_tracker { + spinlock_t lock; + + /* + * Sectors of in-flight IO. + */ + sector_t in_flight; + + /* + * The time, in jiffies, when this device became idle + * (if it is indeed idle). + */ + unsigned long idle_time; + unsigned long last_update_time; +}; + +static inline void dm_iot_init(struct dm_io_tracker *iot) +{ + spin_lock_init(&iot->lock); + iot->in_flight = 0ul; + iot->idle_time = 0ul; + iot->last_update_time = jiffies; +} + +static inline bool dm_iot_idle_for(struct dm_io_tracker *iot, unsigned long j) +{ + bool r = false; + + spin_lock_irq(&iot->lock); + if (!iot->in_flight) + r = time_after(jiffies, iot->idle_time + j); + spin_unlock_irq(&iot->lock); + + return r; +} + +static inline unsigned long dm_iot_idle_time(struct dm_io_tracker *iot) +{ + unsigned long r = 0; + + spin_lock_irq(&iot->lock); + if (!iot->in_flight) + r = jiffies - iot->idle_time; + spin_unlock_irq(&iot->lock); + + return r; +} + +static inline void dm_iot_io_begin(struct dm_io_tracker *iot, sector_t len) +{ + spin_lock_irq(&iot->lock); + iot->in_flight += len; + spin_unlock_irq(&iot->lock); +} + +static inline void dm_iot_io_end(struct dm_io_tracker *iot, sector_t len) +{ + unsigned long flags; + + if (!len) + return; + + spin_lock_irqsave(&iot->lock, flags); + iot->in_flight -= len; + if (!iot->in_flight) + iot->idle_time = jiffies; + spin_unlock_irqrestore(&iot->lock, flags); +} + +#endif -- cgit v1.3.1