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Subjectperf top -g -U --sort=symbol --children == lalalalala?
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Seems the now default on --children thingy doesn't like -U much. 

Samples: 5K of event 'cycles', Event count (approx.): 2268660922
Children Self Symbol
+ 46.42% 0.04% [k] system_call_fastpath
+ 27.12% 0.80% [k] apic_timer_interrupt
+ 26.26% 0.23% [k] smp_apic_timer_interrupt
+ 20.43% 0.13% [k] local_apic_timer_interrupt
+ 20.20% 0.74% [k] hrtimer_interrupt
+ 18.01% 0.39% [k] __run_hrtimer
+ 14.43% 0.35% [k] tick_sched_timer
+ 13.60% 0.05% [k] sys_poll
+ 13.09% 1.16% [k] do_sys_poll
+ 12.16% 0.08% [k] tick_sched_handle.isra.16
+ 11.70% 0.32% [k] update_process_times
+ 11.41% 0.03% [k] sys_read
+ 11.17% 0.11% [k] vfs_read
+ 10.85% 0.09% [k] seq_read
+ 8.27% 0.09% [k] proc_single_show
+ 7.79% 1.19% [k] page_fault
+ 7.01% 0.25% [k] scheduler_tick
+ 6.26% 0.11% [k] __do_page_fault
+ 5.97% 1.33% [k] do_task_stat
+ 5.91% 0.23% [k] handle_mm_fault
+ 5.40% 0.20% [k] do_sys_open
+ 5.02% 0.09% [k] ret_from_intr
+ 4.94% 0.05% [k] do_IRQ
+ 4.70% 0.14% [k] path_openat
+ 4.69% 0.62% [k] tty_poll
+ 4.69% 0.16% [k] irq_exit
+ 4.49% 0.63% [k] __do_softirq
+ 4.27% 0.12% [k] __alloc_pages_nodemask
+ 3.95% 0.03% [k] handle_irq_event_percpu
+ 3.51% 0.71% [k] __fget_light
+ 3.47% 0.04% [k] sys_select
+ 3.39% 0.08% [k] seq_printf
+ 3.37% 0.07% [k] sys_open
+ 3.34% 0.11% [k] seq_vprintf
+ 3.22% 0.02% [k] core_sys_select
+ 3.15% 0.26% [k] do_select
+ 3.15% 3.15% [k] _raw_spin_lock





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