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tracing/histogram: Fix stacktrace histogram Documententation
Fix a small problem with the histogram specification in the Documentation, and change the example to show output using a stacktrace field rather than the global stacktrace. Link: https://lkml.kernel.org/r/f75f807dd4998249e513515f703a2ff7407605f4.1676063532.git.zanussi@kernel.org Signed-off-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi
Steven Rostedt (Google)
parent
f5914b301a
commit
d8f0ae3ebe
@ -1993,82 +1993,106 @@ uninterruptible state::
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A synthetic event that has a stacktrace field may use it as a key in
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histogram::
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# echo 'hist:delta.buckets=100,stack.stacktrace:sort=delta' > events/synthetic/block_lat/trigger
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# echo 'hist:keys=delta.buckets=100,stack.stacktrace:sort=delta' > events/synthetic/block_lat/trigger
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# cat events/synthetic/block_lat/hist
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# event histogram
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#
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# trigger info: hist:keys=delta.buckets=100,stacktrace:vals=hitcount:sort=delta.buckets=100:size=2048 [active]
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# trigger info: hist:keys=delta.buckets=100,stack.stacktrace:vals=hitcount:sort=delta.buckets=100:size=2048 [active]
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#
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{ delta: ~ 0-99, stacktrace:
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event_hist_trigger+0x464/0x480
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event_triggers_call+0x52/0xe0
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trace_event_buffer_commit+0x193/0x250
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trace_event_raw_event_sched_switch+0xfc/0x150
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__traceiter_sched_switch+0x41/0x60
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__schedule+0x448/0x7b0
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schedule_idle+0x26/0x40
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cpu_startup_entry+0x19/0x20
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start_secondary+0xed/0xf0
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secondary_startup_64_no_verify+0xe0/0xeb
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} hitcount: 6
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{ delta: ~ 0-99, stacktrace:
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event_hist_trigger+0x464/0x480
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event_triggers_call+0x52/0xe0
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trace_event_buffer_commit+0x193/0x250
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trace_event_raw_event_sched_switch+0xfc/0x150
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__traceiter_sched_switch+0x41/0x60
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__schedule+0x448/0x7b0
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schedule_idle+0x26/0x40
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cpu_startup_entry+0x19/0x20
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__pfx_kernel_init+0x0/0x10
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arch_call_rest_init+0xa/0x24
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start_kernel+0x964/0x98d
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secondary_startup_64_no_verify+0xe0/0xeb
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} hitcount: 3
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{ delta: ~ 0-99, stacktrace:
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event_hist_trigger+0x464/0x480
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event_triggers_call+0x52/0xe0
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trace_event_buffer_commit+0x193/0x250
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trace_event_raw_event_sched_switch+0xfc/0x150
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__traceiter_sched_switch+0x41/0x60
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__schedule+0x448/0x7b0
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schedule+0x5a/0xb0
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worker_thread+0xaf/0x380
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kthread+0xe9/0x110
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ret_from_fork+0x2c/0x50
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{ delta: ~ 0-99, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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io_schedule+0x46/0x80
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bit_wait_io+0x11/0x80
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__wait_on_bit+0x4e/0x120
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out_of_line_wait_on_bit+0x8d/0xb0
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__wait_on_buffer+0x33/0x40
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jbd2_journal_commit_transaction+0x155a/0x19b0
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kjournald2+0xab/0x270
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kthread+0xfa/0x130
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ret_from_fork+0x29/0x50
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} hitcount: 1
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{ delta: ~ 100-199, stacktrace:
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event_hist_trigger+0x464/0x480
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event_triggers_call+0x52/0xe0
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trace_event_buffer_commit+0x193/0x250
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trace_event_raw_event_sched_switch+0xfc/0x150
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__traceiter_sched_switch+0x41/0x60
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__schedule+0x448/0x7b0
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schedule_idle+0x26/0x40
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cpu_startup_entry+0x19/0x20
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start_secondary+0xed/0xf0
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secondary_startup_64_no_verify+0xe0/0xeb
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} hitcount: 15
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[..]
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{ delta: ~ 8500-8599, stacktrace:
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event_hist_trigger+0x464/0x480
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event_triggers_call+0x52/0xe0
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trace_event_buffer_commit+0x193/0x250
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trace_event_raw_event_sched_switch+0xfc/0x150
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__traceiter_sched_switch+0x41/0x60
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__schedule+0x448/0x7b0
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schedule_idle+0x26/0x40
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cpu_startup_entry+0x19/0x20
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start_secondary+0xed/0xf0
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secondary_startup_64_no_verify+0xe0/0xeb
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{ delta: ~ 0-99, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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io_schedule+0x46/0x80
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rq_qos_wait+0xd0/0x170
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wbt_wait+0x9e/0xf0
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__rq_qos_throttle+0x25/0x40
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blk_mq_submit_bio+0x2c3/0x5b0
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__submit_bio+0xff/0x190
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submit_bio_noacct_nocheck+0x25b/0x2b0
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submit_bio_noacct+0x20b/0x600
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submit_bio+0x28/0x90
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ext4_bio_write_page+0x1e0/0x8c0
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mpage_submit_page+0x60/0x80
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mpage_process_page_bufs+0x16c/0x180
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mpage_prepare_extent_to_map+0x23f/0x530
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} hitcount: 1
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{ delta: ~ 0-99, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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schedule_hrtimeout_range_clock+0x97/0x110
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schedule_hrtimeout_range+0x13/0x20
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usleep_range_state+0x65/0x90
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__intel_wait_for_register+0x1c1/0x230 [i915]
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intel_psr_wait_for_idle_locked+0x171/0x2a0 [i915]
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intel_pipe_update_start+0x169/0x360 [i915]
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intel_update_crtc+0x112/0x490 [i915]
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skl_commit_modeset_enables+0x199/0x600 [i915]
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intel_atomic_commit_tail+0x7c4/0x1080 [i915]
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intel_atomic_commit_work+0x12/0x20 [i915]
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process_one_work+0x21c/0x3f0
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worker_thread+0x50/0x3e0
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kthread+0xfa/0x130
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} hitcount: 3
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{ delta: ~ 0-99, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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schedule_timeout+0x11e/0x160
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__wait_for_common+0x8f/0x190
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wait_for_completion+0x24/0x30
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__flush_work.isra.0+0x1cc/0x360
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flush_work+0xe/0x20
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drm_mode_rmfb+0x18b/0x1d0 [drm]
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drm_mode_rmfb_ioctl+0x10/0x20 [drm]
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drm_ioctl_kernel+0xb8/0x150 [drm]
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drm_ioctl+0x243/0x560 [drm]
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__x64_sys_ioctl+0x92/0xd0
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do_syscall_64+0x59/0x90
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entry_SYSCALL_64_after_hwframe+0x72/0xdc
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} hitcount: 1
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{ delta: ~ 0-99, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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schedule_timeout+0x87/0x160
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__wait_for_common+0x8f/0x190
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wait_for_completion_timeout+0x1d/0x30
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drm_atomic_helper_wait_for_flip_done+0x57/0x90 [drm_kms_helper]
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intel_atomic_commit_tail+0x8ce/0x1080 [i915]
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intel_atomic_commit_work+0x12/0x20 [i915]
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process_one_work+0x21c/0x3f0
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worker_thread+0x50/0x3e0
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kthread+0xfa/0x130
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ret_from_fork+0x29/0x50
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} hitcount: 1
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{ delta: ~ 100-199, stack.stacktrace __schedule+0xa19/0x1520
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schedule+0x6b/0x110
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schedule_hrtimeout_range_clock+0x97/0x110
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schedule_hrtimeout_range+0x13/0x20
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usleep_range_state+0x65/0x90
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pci_set_low_power_state+0x17f/0x1f0
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pci_set_power_state+0x49/0x250
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pci_finish_runtime_suspend+0x4a/0x90
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pci_pm_runtime_suspend+0xcb/0x1b0
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__rpm_callback+0x48/0x120
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rpm_callback+0x67/0x70
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rpm_suspend+0x167/0x780
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rpm_idle+0x25a/0x380
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pm_runtime_work+0x93/0xc0
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process_one_work+0x21c/0x3f0
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} hitcount: 1
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Totals:
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Hits: 89
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Entries: 11
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Dropped: 0
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Hits: 10
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Entries: 7
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Dropped: 0
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2.2.3 Hist trigger 'handlers' and 'actions'
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-------------------------------------------
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