mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 23:20:50 +07:00
60bda037f1
Using a linear O(N) search for timer insertion affects execution time and D-cache footprint badly with a larger number of timers. Switch the storage to a timerqueue which is already used for hrtimers and alarmtimers. It does not affect the size of struct k_itimer as it.alarm is still larger. The extra list head for the expiry list will go away later once the expiry is moved into task work context. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1908272129220.1939@nanos.tec.linutronix.de
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_TIMERQUEUE_H
|
|
#define _LINUX_TIMERQUEUE_H
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/ktime.h>
|
|
|
|
|
|
struct timerqueue_node {
|
|
struct rb_node node;
|
|
ktime_t expires;
|
|
};
|
|
|
|
struct timerqueue_head {
|
|
struct rb_root_cached rb_root;
|
|
};
|
|
|
|
|
|
extern bool timerqueue_add(struct timerqueue_head *head,
|
|
struct timerqueue_node *node);
|
|
extern bool timerqueue_del(struct timerqueue_head *head,
|
|
struct timerqueue_node *node);
|
|
extern struct timerqueue_node *timerqueue_iterate_next(
|
|
struct timerqueue_node *node);
|
|
|
|
/**
|
|
* timerqueue_getnext - Returns the timer with the earliest expiration time
|
|
*
|
|
* @head: head of timerqueue
|
|
*
|
|
* Returns a pointer to the timer node that has the earliest expiration time.
|
|
*/
|
|
static inline
|
|
struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
|
|
{
|
|
struct rb_node *leftmost = rb_first_cached(&head->rb_root);
|
|
|
|
return rb_entry(leftmost, struct timerqueue_node, node);
|
|
}
|
|
|
|
static inline void timerqueue_init(struct timerqueue_node *node)
|
|
{
|
|
RB_CLEAR_NODE(&node->node);
|
|
}
|
|
|
|
static inline bool timerqueue_node_queued(struct timerqueue_node *node)
|
|
{
|
|
return !RB_EMPTY_NODE(&node->node);
|
|
}
|
|
|
|
static inline bool timerqueue_node_expires(struct timerqueue_node *node)
|
|
{
|
|
return node->expires;
|
|
}
|
|
|
|
static inline void timerqueue_init_head(struct timerqueue_head *head)
|
|
{
|
|
head->rb_root = RB_ROOT_CACHED;
|
|
}
|
|
#endif /* _LINUX_TIMERQUEUE_H */
|