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[PATCH] hrtimers: cleanup locking

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Improve kernel/hrtimers.c locking: use a per-CPU base with a lock to control
locking of all clocks belonging to a CPU.  This simplifies code that needs to
lock all clocks at once.  This makes life easier for high-res timers and
dyntick.

No functional changes.

[ optimization change from Andrew Morton <akpm@osdl.org> ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2007-02-16 01:27:50 -08:00 • committed by Linus Torvalds
parent c9cb2e3d7c
commit 3c8aa39d7c
2 changed files with 126 additions and 101 deletions
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43
include/linux/hrtimer.h
View file

@ -21,6 +21,9 @@
#include <linux/list.h>
#include <linux/wait.h>
struct hrtimer_clock_base;
struct hrtimer_cpu_base;
/*
* Mode arguments of xxx_hrtimer functions:
*/
@ -37,8 +40,6 @@ enum hrtimer_restart {
HRTIMER_RESTART, /* Timer must be restarted */
};
struct hrtimer_base;
/**
* struct hrtimer - the basic hrtimer structure
* @node: red black tree node for time ordered insertion
@ -51,10 +52,10 @@ struct hrtimer_base;
* The hrtimer structure must be initialized by init_hrtimer_#CLOCKTYPE()
*/
struct hrtimer {
struct rb_node node;
ktime_t expires;
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_base *base;
struct rb_node node;
ktime_t expires;
enum hrtimer_restart (*function)(struct hrtimer *);
struct hrtimer_clock_base *base;
};
/**
@ -71,29 +72,41 @@ struct hrtimer_sleeper {
/**
* struct hrtimer_base - the timer base for a specific clock
* @index: clock type index for per_cpu support when moving a timer
* to a base on another cpu.
* @lock: lock protecting the base and associated timers
* @index: clock type index for per_cpu support when moving a
* timer to a base on another cpu.
* @active: red black tree root node for the active timers
* @first: pointer to the timer node which expires first
* @resolution: the resolution of the clock, in nanoseconds
* @get_time: function to retrieve the current time of the clock
* @get_softirq_time: function to retrieve the current time from the softirq
* @curr_timer: the timer which is executing a callback right now
* @softirq_time: the time when running the hrtimer queue in the softirq
* @lock_key: the lock_class_key for use with lockdep
*/
struct hrtimer_base {
struct hrtimer_clock_base {
struct hrtimer_cpu_base *cpu_base;
clockid_t index;
spinlock_t lock;
struct rb_root active;
struct rb_node *first;
ktime_t resolution;
ktime_t (*get_time)(void);
ktime_t (*get_softirq_time)(void);
struct hrtimer *curr_timer;
ktime_t softirq_time;
struct lock_class_key lock_key;
};
#define HRTIMER_MAX_CLOCK_BASES 2
/*
* struct hrtimer_cpu_base - the per cpu clock bases
* @lock: lock protecting the base and associated clock bases
* and timers
* @lock_key: the lock_class_key for use with lockdep
* @clock_base: array of clock bases for this cpu
* @curr_timer: the timer which is executing a callback right now
*/
struct hrtimer_cpu_base {
spinlock_t lock;
struct lock_class_key lock_key;
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
struct hrtimer *curr_timer;
};
/*