perf report fractal output issue

[Anton Blanchard]

Hi,

I noticed a problem where I wasn't always getting callchains:

# perf report
    98.47%  lock1_processes  [kernel]                [k] .lock_kernel

     0.91%  lock1_processes  [kernel]                [k] .fput


But a flat output confirmed the data is there:

# perf report -g flat
    98.47%  lock1_processes  [kernel]                             [k] .lock_kernel
            98.47%
                .lock_kernel
                .__posix_lock_file
                (nil)
                .fcntl_setlk
                .sys_fcntl
                syscall_exit
                0xfffb7d04844
                .testcase
                .testcase
                .affinitize
                .new_task
                .main
                0xfffb7c4933c
                0xfffb7c4955c
                (nil)

It looks like callchain__fprintf_graph() only prints the callchain if we
have at least one rb entry at the top. In my case all the associated
backtraces are identical so I assume we dont have to do any splitting.

Anton
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