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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-08-23 15:29:42 +0200 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2011-09-08 11:10:56 +0200 |
| commit | d1748302f70be7469809809283fe164156a34231 (patch) | |
| tree | c81137f4126f2fe1451c28441415c1cd0fa0f7cd /include/linux/clockchips.h | |
| parent | nohz: Remove "Switched to NOHz mode" debugging messages (diff) | |
| download | linux-dev-d1748302f70be7469809809283fe164156a34231.tar.xz linux-dev-d1748302f70be7469809809283fe164156a34231.zip | |
clockevents: Make minimum delay adjustments configurable
The automatic increase of the min_delta_ns of a clockevents device
should be done in the clockevents code as the minimum delay is an
attribute of the clockevents device.
In addition not all architectures want the automatic adjustment, on a
massively virtualized system it can happen that the programming of a
clock event fails several times in a row because the virtual cpu has
been rescheduled quickly enough. In that case the minimum delay will
erroneously be increased with no way back. The new config symbol
GENERIC_CLOCKEVENTS_MIN_ADJUST is used to enable the automatic
adjustment. The config option is selected only for x86.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: john stultz <johnstul@us.ibm.com>
Link: http://lkml.kernel.org/r/20110823133142.494157493@de.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/clockchips.h')
| -rw-r--r-- | include/linux/clockchips.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index d6733e27af34..39bb050bdbb2 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -140,7 +140,7 @@ extern void clockevents_set_mode(struct clock_event_device *dev, enum clock_event_mode mode); extern int clockevents_register_notifier(struct notifier_block *nb); extern int clockevents_program_event(struct clock_event_device *dev, - ktime_t expires, ktime_t now); + ktime_t expires, bool force); extern void clockevents_handle_noop(struct clock_event_device *dev); |