perf hists browser: Align column header in hierarchy mode
Like in stdio, fit column header to hierarchy output. Merge column headers with "/" as a separator. Overhead Command / Shared Object / Symbol ... + 0.09% dwm + 0.06% emacs - 0.05% perf - 0.05% [kernel.vmlinux] + 0.03% [k] memcpy_orig + 0.01% [k] unmap_single_vma + 0.01% [k] smp_call_function_single + 0.00% [k] native_irq_return_iret + 0.00% [k] arch_trigger_all_cpu_backtrace_handler + 0.00% [k] native_write_msr_safe Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1456326830-30456-15-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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