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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-11-12 22:12:06 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-11-13 20:46:24 +0100 |
| commit | 27185016b806d5a1181ff501cae120582b2b27dd (patch) | |
| tree | 44b0da428fccaea1ad83c537bcc99a80b9251227 /include/linux/tick.h | |
| parent | 98962465ed9e6ea99c38e0af63fe1dcb5a79dc25 (diff) | |
| download | op-kernel-dev-27185016b806d5a1181ff501cae120582b2b27dd.zip op-kernel-dev-27185016b806d5a1181ff501cae120582b2b27dd.tar.gz | |
nohz: Track last do_timer() cpu
The previous patch which limits the sleep time to the maximum
deferment time of the time keeping clocksource has some limitations on
SMP machines: if all CPUs are idle then for all CPUs the maximum sleep
time is limited.
Solve this by keeping track of which cpu had the do_timer() duty
assigned last and limit the sleep time only for this cpu.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: John Stultz <johnstul@us.ibm.com>
Diffstat (limited to 'include/linux/tick.h')
| -rw-r--r-- | include/linux/tick.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h index 8dc0821..d2ae79e 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -43,6 +43,7 @@ enum tick_nohz_mode { * @idle_exittime: Time when the idle state was left * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped * @sleep_length: Duration of the current idle sleep + * @do_timer_lst: CPU was the last one doing do_timer before going idle */ struct tick_sched { struct hrtimer sched_timer; @@ -64,6 +65,7 @@ struct tick_sched { unsigned long last_jiffies; unsigned long next_jiffies; ktime_t idle_expires; + int do_timer_last; }; extern void __init tick_init(void); |
