G'Day,
Not sure this is the right place to send ftrace feature requests (or
if I should try to send patches instead), so please redirect me if
needed...
Function profiling is great. Is there a way to filter by PID?
set_ftrace_pid doesn't seem to work:
# echo nop > current_tracer
# echo $$ > set_ftrace_pid
# echo 0 > function_profile_enabled
# echo 1 > function_profile_enabled
# head trace_stat/function0
Function Hit Time Avg
s^2
-------- --- ---- ---
---
ext4_evict_inode 358 501550.3 us
1400.978 us 4247547 us
ext4_mark_inode_dirty 6951 92433.96 us 13.297
us 2423567 us
ext4_reserve_inode_write 7738 86654.82 us 11.198
us 711959.6 us
ext4_file_write_iter 348 81828.82 us
235.140 us 971130.5 us
ext4_dirty_inode 1178 77598.27 us 65.872
us 294410.3 us
ext4_da_write_end 348 76089.57 us
218.648 us 966750.6 us
ext4_rename 357 40821.26 us
114.345 us 160818.4 us
ext4_alloc_da_blocks 357 34260.99 us 95.969
us 160912.0 us
Is it possible that set_ftrace_pid could support function profiling?
thanks,
Brendan
--
http://www.brendangregg.com
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