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    Subject[PATCH 04/11] perf_counter: use list_move_tail
    Instead of del/add use a move list-op.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    kernel/perf_counter.c | 6 ++----
    1 file changed, 2 insertions(+), 4 deletions(-)

    Index: linux-2.6/kernel/perf_counter.c
    ===================================================================
    --- linux-2.6.orig/kernel/perf_counter.c
    +++ linux-2.6/kernel/perf_counter.c
    @@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *co
    list_for_each_entry_safe(sibling, tmp,
    &counter->sibling_list, list_entry) {

    - list_del_init(&sibling->list_entry);
    - list_add_tail(&sibling->list_entry, &ctx->counter_list);
    + list_move_tail(&sibling->list_entry, &ctx->counter_list);
    sibling->group_leader = sibling;
    }
    }
    @@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_count
    */
    perf_flags = hw_perf_save_disable();
    list_for_each_entry(counter, &ctx->counter_list, list_entry) {
    - list_del(&counter->list_entry);
    - list_add_tail(&counter->list_entry, &ctx->counter_list);
    + list_move_tail(&counter->list_entry, &ctx->counter_list);
    break;
    }
    hw_perf_restore(perf_flags);
    --



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