preemption latency trace v1.0.2
-------------------------------
 latency: 235 us, entries: 12 (12)
    -----------------
    | task: ksoftirqd/0/2, uid:0 nice:-10 policy:1 rt_prio:96
    -----------------
 => started at: e1000_update_stats+0x28/0x7f0
 => ended at:   e1000_update_stats+0x6d0/0x7f0
=======>
00000001 0.000ms (+0.000ms): e1000_update_stats (e1000_watchdog)
00000001 0.133ms (+0.133ms): e1000_read_phy_reg (e1000_update_stats)
00000001 0.133ms (+0.000ms): e1000_read_phy_reg_ex (e1000_update_stats)
00000001 0.134ms (+0.000ms): __const_udelay (e1000_read_phy_reg_ex)
00000001 0.134ms (+0.000ms): __delay (e1000_read_phy_reg_ex)
00000001 0.134ms (+0.000ms): delay_pmtmr (__delay)
00000001 0.184ms (+0.050ms): e1000_read_phy_reg (e1000_update_stats)
00000001 0.185ms (+0.000ms): e1000_read_phy_reg_ex (e1000_update_stats)
00000001 0.185ms (+0.000ms): __const_udelay (e1000_read_phy_reg_ex)
00000001 0.185ms (+0.000ms): __delay (e1000_read_phy_reg_ex)
00000001 0.185ms (+0.000ms): delay_pmtmr (__delay)
00000001 0.235ms (+0.050ms): sub_preempt_count (e1000_update_stats)