• Peter Zijlstra's avatar
    perf: Optimize perf_swevent_ctx_event() · 81520183
    Peter Zijlstra authored
    Remove a rcu_read_{,un}lock() pair and a few conditionals.
    
    We can remove the rcu_read_lock() by increasing the scope of one
    in the calling function.
    
    We can do away with the system_state check if the machine still
    boots after this patch (seems to be the case).
    
    We can do away with the list_empty() check because the bare
    list_for_each_entry_rcu() reduces to that now that we've removed
    everything else.
    Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <20091120212508.378188589@chello.nl>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    81520183
perf_event.c 120 KB