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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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-03-13 12:21:29 +01:00 committed by Ingo Molnar
parent 595258aaea
commit 755642322a
1 changed files with 2 additions and 4 deletions
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6
kernel/perf_counter.c
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@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx)
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_counter_context *ctx)
*/
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);