• Frederic Weisbecker's avatar
    context_tracking: Optimize main APIs off case with static key · ad65782f
    Frederic Weisbecker authored
    Optimize user and exception entry/exit APIs with static
    keys. This minimize the overhead for those who enable
    CONFIG_NO_HZ_FULL without always using it. Having no range
    passed to nohz_full= should result in the probes to be nopped
    (at least we hope so...).
    
    If this proves not be enough in the long term, we'll need
    to bring an exception slow path by re-routing the exception
    handlers.
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Li Zhong <zhong@linux.vnet.ibm.com>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Kevin Hilman <khilman@linaro.org>
    ad65782f
context_tracking.c 6.64 KB