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    SubjectRe: [BUG] msr-trace.h:42 suspicious rcu_dereference_check() usage!
    > I took a look at this and forced some more functions to be inlined. I
    > did a little tweaking here and there. Could you pull my tree and see if
    > things are better? I don't currently have the hardware to run this
    > myself.
    >
    > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
    >
    > branch: ftrace/core

    Didn't help much unfortunately. I think you need a real fast path here.

    http://halobates.de/tracepoint-trace2

    $ wc -l tracepoint-trace2
    595 tracepoint-trace2

    Opcode Histogram:

    201 mov
    51 push
    51 pop
    34 test
    32 cmp
    26 jz
    24 jnz
    24 and
    16 ret
    16 lea
    15 call
    12 add
    10 jmp

    Functions with # of instructions:

    25 trace_event_raw_event_sched_switch
    19 trace_event_buffer_reserve
    21 trace_event_buffer_lock_reserve
    57 ring_buffer_lock_reserve
    3 trace_clock_local
    3 sched_clock
    24 native_sched_clock
    3 sched_clock
    2 trace_clock_local
    11 ring_buffer_lock_reserve
    81 __rb_reserve_next
    11 ring_buffer_lock_reserve
    6 trace_event_buffer_lock_reserve
    18 ring_buffer_event_data
    5 trace_event_buffer_lock_reserve
    38 tracing_generic_entry_update
    11 trace_event_buffer_lock_reserve
    5 trace_event_buffer_reserve
    18 ring_buffer_event_data
    4 trace_event_buffer_reserve
    28 trace_event_raw_event_sched_switch
    30 trace_event_buffer_commit
    19 trace_buffer_unlock_commit_regs
    11 ring_buffer_unlock_commit
    85 rb_commit
    18 ring_buffer_unlock_commit
    10 trace_buffer_unlock_commit_regs
    3 ftrace_trace_userstack
    7 trace_buffer_unlock_commit_regs
    11 trace_event_buffer_commit
    8 trace_event_raw_event_sched_switch

    -Andi

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