mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 09:14:19 +08:00
5c0de3d72f
Commit 95b88f4d71 ("dm writecache: pause
writeback if cache full and origin being written directly") introduced a
code that pauses cache flushing if we are issuing writes directly to the
origin.
Improve that initial commit by making the timeout code configurable
(via the option "pause_writeback"). Also change the default from 1s to
3s because it performed better.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/*
|
|
* 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 <linux/jiffies.h>
|
|
|
|
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
|