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hrtimer: Align the hrtimer clock bases as well 

We don't use cacheline_align here because that might waste lot of
space on 32bit machine with 64 bytes cachelines and on 64bit machines
with 128 bytes cachelines.

The size of struct hrtimer_clock_base is 64byte on 64bit and 32byte on
32bit machines. So we utilize the cache lines proper.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20150414203501.498165771@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-04-14 21:08:44 +00:00
parent 6d9a141139
commit b8e38413ac
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/hrtimer.h
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@ -130,6 +130,12 @@ struct hrtimer_sleeper {
struct task_struct *task;
};
#ifdef CONFIG_64BIT
# define HRTIMER_CLOCK_BASE_ALIGN 64
#else
# define HRTIMER_CLOCK_BASE_ALIGN 32
#endif
/**
* struct hrtimer_clock_base - the timer base for a specific clock
* @cpu_base: per cpu clock base
@ -147,7 +153,7 @@ struct hrtimer_clock_base {
struct timerqueue_head active;
ktime_t (*get_time)(void);
ktime_t offset;
};
} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
enum hrtimer_base_type {
HRTIMER_BASE_MONOTONIC,
@ -195,6 +201,8 @@ struct hrtimer_cpu_base {
static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
{
BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN);
timer->node.expires = time;
timer->_softexpires = time;
}