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authorChangbin Du <changbin.du@gmail.com>2019-01-01 16:46:10 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-02-06 17:56:18 +0100
commit9acd8de69d107537a68d010c9149fa9d9aba91f4 (patch)
tree38d0a608a4b6c4364d176d1be82dff5ee1b186e9 /kernel/.gitignore
parentLinux 5.0-rc5 (diff)
downloadlinux-9acd8de69d107537a68d010c9149fa9d9aba91f4.tar.xz
linux-9acd8de69d107537a68d010c9149fa9d9aba91f4.zip
function_graph: Support displaying relative timestamp
When function_graph is used for latency tracers, relative timestamp is more straightforward than absolute timestamp as function trace does. This change adds relative timestamp support to function_graph and applies to latency tracers (wakeup and irqsoff). Instead of: # tracer: irqsoff # # irqsoff latency trace v1.1.5 on 5.0.0-rc1-test # -------------------------------------------------------------------- # latency: 521 us, #1125/1125, CPU#2 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8) # ----------------- # | task: swapper/2-0 (uid:0 nice:0 policy:0 rt_prio:0) # ----------------- # => started at: __schedule # => ended at: _raw_spin_unlock_irq # # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / # TIME CPU TASK/PID |||| DURATION FUNCTION CALLS # | | | | |||| | | | | | | 124.974306 | 2) systemd-693 | d..1 0.000 us | __schedule(); 124.974307 | 2) systemd-693 | d..1 | rcu_note_context_switch() { 124.974308 | 2) systemd-693 | d..1 0.487 us | rcu_preempt_deferred_qs(); 124.974309 | 2) systemd-693 | d..1 0.451 us | rcu_qs(); 124.974310 | 2) systemd-693 | d..1 2.301 us | } [..] 124.974826 | 2) <idle>-0 | d..2 | finish_task_switch() { 124.974826 | 2) <idle>-0 | d..2 | _raw_spin_unlock_irq() { 124.974827 | 2) <idle>-0 | d..2 0.000 us | _raw_spin_unlock_irq(); 124.974828 | 2) <idle>-0 | d..2 0.000 us | tracer_hardirqs_on(); <idle>-0 2d..2 552us : <stack trace> => __schedule => schedule_idle => do_idle => cpu_startup_entry => start_secondary => secondary_startup_64 Show: # tracer: irqsoff # # irqsoff latency trace v1.1.5 on 5.0.0-rc1-test+ # -------------------------------------------------------------------- # latency: 511 us, #1053/1053, CPU#7 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8) # ----------------- # | task: swapper/7-0 (uid:0 nice:0 policy:0 rt_prio:0) # ----------------- # => started at: __schedule # => ended at: _raw_spin_unlock_irq # # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / # REL TIME CPU TASK/PID |||| DURATION FUNCTION CALLS # | | | | |||| | | | | | | 0 us | 7) sshd-1704 | d..1 0.000 us | __schedule(); 1 us | 7) sshd-1704 | d..1 | rcu_note_context_switch() { 1 us | 7) sshd-1704 | d..1 0.611 us | rcu_preempt_deferred_qs(); 2 us | 7) sshd-1704 | d..1 0.484 us | rcu_qs(); 3 us | 7) sshd-1704 | d..1 2.599 us | } [..] 509 us | 7) <idle>-0 | d..2 | finish_task_switch() { 510 us | 7) <idle>-0 | d..2 | _raw_spin_unlock_irq() { 510 us | 7) <idle>-0 | d..2 0.000 us | _raw_spin_unlock_irq(); 512 us | 7) <idle>-0 | d..2 0.000 us | tracer_hardirqs_on(); <idle>-0 7d..2 543us : <stack trace> => __schedule => schedule_idle => do_idle => cpu_startup_entry => start_secondary => secondary_startup_64 Link: http://lkml.kernel.org/r/20190101154614.8887-2-changbin.du@gmail.com Signed-off-by: Changbin Du <changbin.du@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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