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authorBorislav Petkov <bp@alien8.de>2013-04-22 02:12:42 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-08-19 04:37:17 +0400
commitd1d74d14e98a6be740a6f12456c7d9ad47be9c9c (patch)
tree2a0d4f2b81e587ecbbc0362314a36ddec2ff64f2 /include/linux
parentf7f7bac9cb1c50783f15937a11743655a5756a36 (diff)
downloadlinux-d1d74d14e98a6be740a6f12456c7d9ad47be9c9c.tar.xz
rcu: Expedite grace periods during suspend/resume
CONFIG_RCU_FAST_NO_HZ can increase grace-period durations by up to a factor of four, which can result in long suspend and resume times. Thus, this commit temporarily switches to expedited grace periods when suspending the box and return to normal settings when resuming. Similar logic is applied to hibernation. Because expedited grace periods are of dubious benefit on very large systems, so this commit restricts their automated use during suspend and resume to systems of 256 or fewer CPUs. (Some day a number of Linux-kernel facilities, including RCU's expedited grace periods, will be more scalable, but I need to see bug reports first.) [ paulmck: This also papers over an audio/irq bug, but hopefully that will be fixed soon. ] Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'include/linux')
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