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1b27b73a99
It can perform statistics on running hot spots or record function calls
arm-none-eabi-gprof nuttx/nuttx gmon.out -b
Flat profile:
Each sample counts as 0.001 seconds.
% cumulative self self total
time seconds seconds calls s/call s/call name
66.41 3.55 3.55 43 0.08 0.08 sdelay
33.44 5.34 1.79 44 0.04 0.04 delay
0.07 5.34 0.00 up_idle
0.04 5.34 0.00 nx_start
0.02 5.34 0.00 fdtdump_main
0.02 5.34 0.00 nxsem_wait
0.00 5.34 0.00 1 0.00 5.34 hello_main
0.00 5.34 0.00 1 0.00 0.00 singal_handler
granularity: each sample hit covers 4 byte(s) for 0.02% of 5.34 seconds
index % time self children called name
0.00 5.34 1/1 nxtask_startup [2]
[1] 99.9 0.00 5.34 1 hello_main [1]
3.55 0.00 43/43 sdelay [3]
1.79 0.00 44/44 delay [4]
-----------------------------------------------
<spontaneous>
[2] 99.9 0.00 5.34 nxtask_startup [2]
0.00 5.34 1/1 hello_main [1]
-----------------------------------------------
3.55 0.00 43/43 hello_main [1]
[3] 66.4 3.55 0.00 43 sdelay [3]
-----------------------------------------------
1.79 0.00 44/44 hello_main [1]
[4] 33.4 1.79 0.00 44 delay [4]
-----------------------------------------------
<spontaneous>
[5] 0.1 0.00 0.00 up_idle [5]
-----------------------------------------------
<spontaneous>
[6] 0.0 0.00 0.00 nx_start [6]
-----------------------------------------------
<spontaneous>
[7] 0.0 0.00 0.00 fdtdump_main [7]
-----------------------------------------------
<spontaneous>
[8] 0.0 0.00 0.00 nxsem_wait [8]
-----------------------------------------------
0.00 0.00 1/1 nxsig_deliver [3553]
[9] 0.0 0.00 0.00 1 singal_handler [9]
-----------------------------------------------
Index by function name
[4] delay [6] nx_start [9] singal_handler
[7] fdtdump_main [8] nxsem_wait [5] up_idle
[1] hello_main [3] sdelay
Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>