• Paul E. McKenney's avatar
    rcu: Place guard on rcu_all_qs() and rcu_note_context_switch() actions · 9226b10d
    Paul E. McKenney authored
    The rcu_all_qs() and rcu_note_context_switch() do a series of checks,
    taking various actions to supply RCU with quiescent states, depending
    on the outcomes of the various checks.  This is a bit much for scheduling
    fastpaths, so this commit creates a separate ->rcu_urgent_qs field in
    the rcu_dynticks structure that acts as a global guard for these checks.
    Thus, in the common case, rcu_all_qs() and rcu_note_context_switch()
    check the ->rcu_urgent_qs field, find it false, and simply return.
    Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    9226b10d
tree.h 29.3 KB