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    Subject[PATCH] perf_counter: extensible perf_counter_attr
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    Allow extending the perf_counter_attr structure by linking extended
    structures to it.

    Also, should we grow the directly reserved space in the structure a
    little more?

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/perf_counter.h | 7 +++++++
    kernel/perf_counter.c | 1 +
    2 files changed, 8 insertions(+), 0 deletions(-)

    diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
    index 3586df8..781d8ce 100644
    --- a/include/linux/perf_counter.h
    +++ b/include/linux/perf_counter.h
    @@ -175,6 +175,13 @@ struct perf_counter_attr {
    __u32 __reserved_3;

    __u64 __reserved_4;
    +
    + struct perf_counter_attr_ext *ext_attrs;
    +};
    +
    +struct perf_counter_attr_ext {
    + struct perf_counter_attr_ext *next;
    + __u64 perf_attr_ext_type;
    };

    /*
    diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
    index 5eacaaf..606f662 100644
    --- a/kernel/perf_counter.c
    +++ b/kernel/perf_counter.c
    @@ -3467,6 +3467,7 @@ perf_counter_alloc(struct perf_counter_attr *attr,

    counter->cpu = cpu;
    counter->attr = *attr;
    + counter->attr.ext_attrs = NULL;
    counter->group_leader = group_leader;
    counter->pmu = NULL;
    counter->ctx = ctx;


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