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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-12-16 05:57:10 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2014-02-25 12:39:00 -0800
commitd550e81dc0ddc04f1b417c179c214103a28e0ee8 (patch)
treea873c6b1a980500c59af7b194374d604e3dba1eb /fs/proc_namespace.c
parentfff421580f512fc044cc7421fdff31a7a6997350 (diff)
timers: Reduce __run_timers() latency for empty list
The __run_timers() function currently steps through the list one jiffy at a time in order to update the timer wheel. However, if the timer wheel is empty, no adjustment is needed other than updating ->timer_jiffies. In this case, which is likely to be common for NO_HZ_FULL kernels, the kernel currently incurs a large latency for no good reason. This commit therefore short-circuits this case. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Mike Galbraith <bitbucket@online.de>
Diffstat (limited to 'fs/proc_namespace.c')
0 files changed, 0 insertions, 0 deletions