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Message-Id: <201209170118.25955.andres@anarazel.de>
Date: Mon, 17 Sep 2012 01:18:25 +0200
From: Andres Freund <andres@...razel.de>
To: LKML <linux-kernel@...r.kernel.org>,
David Airlie <airlied@...ux.ie>,
Jerome Glisse <jglisse@...hat.com>,
Alex Deucher <alexander.deucher@....com>
Subject: Excessive kernel time inside ttm when scrolling on a r700 in a multimonitor setup
Hi everyone,
In several gui programs, most notably and reproducably, I can trivially make
Xorg spend the whole cpu time in the kernel. It might be an Xorg bug, but
from my untrained gut feeling it doesn't look that way.
Anything more you need than whats already in the email?
Here are some details:
08:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Barts XT [Radeon HD 6800 Series] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited Device 174b
Flags: bus master, fast devsel, latency 0, IRQ 76
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at fbec0000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at fbea0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon
Perf HW Details:
# ========
# captured on: Mon Sep 17 00:58:11 2012
# hostname : awork2
# os release : 3.6.0-rc4-andres-00001-ga7ab0ca
# perf version : 3.5.7078.gf7da9c
# arch : x86_64
# nrcpus online : 16
# nrcpus avail : 16
# cpudesc : Intel(R) Xeon(R) CPU E5520 @ 2.27GHz
# cpuid : GenuineIntel,6,26,5
# total memory : 24676596 kB
# cmdline : /home/andres/bin/perf record -ag
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, id = { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 }
# sibling cores : 0-3,8-11
# sibling cores : 4-7,12-15
# sibling threads : 0,8
# sibling threads : 1,9
# sibling threads : 2,10
# sibling threads : 3,11
# sibling threads : 4,12
# sibling threads : 5,13
# sibling threads : 6,14
# sibling threads : 7,15
# node0 meminfo : total = 12573680 kB, free = 5583760 kB
# node0 cpu list : 0-3,8-11
# node1 meminfo : total = 12582912 kB, free = 9097668 kB
# node1 cpu list : 4-7,12-15
This is on debian unstable with their xserver et al.
$ apt-cache policy xserver-xorg-core|grep Installed
Installed: 2:1.12.3.902-1
$ apt-cache policy xserver-xorg-video-radeon|grep Installed
Installed: 1:6.14.4-5
Note that I profiled this on a 3 monitor setup:
$ xrandr|grep -E 'Screen|connected'
Screen 0: minimum 320 x 200, current 4960 x 1920, maximum 16384 x 16384
DVI-1 connected 2560x1600+1200+0 (normal left inverted right x axis y axis) 641mm x 401mm
DisplayPort-0 connected 1200x1920+0+0 left (normal left inverted right x axis y axis) 518mm x 324mm
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1200x1920+3760+0 left (normal left inverted right x axis y axis) 518mm x 324mm
The profile:
# Overhead Command Shared Object Symbol
# ........ ............... ............................... ...................................................................................................................................................................................................................
#
42.27% Xorg [kernel.kallsyms] [k] default_send_IPI_mask_allbutself_phys
|
--- default_send_IPI_mask_allbutself_phys
|
|--100.00%-- physflat_send_IPI_allbutself
| native_send_call_func_ipi
| smp_call_function_many
| smp_call_function
| on_each_cpu
| |
| |--99.97%-- change_page_attr_set_clr
| | _set_pages_array
| | set_pages_array_wc
| | ttm_set_pages_caching
| | ttm_dma_populate
| | radeon_ttm_tt_populate
| | ttm_tt_bind
| | ttm_bo_handle_move_mem
| | ttm_bo_evict
| | ttm_mem_evict_first
| | ttm_bo_mem_space
| | ttm_bo_move_buffer
| | ttm_bo_validate
| | |
| | |--55.15%-- radeon_bo_list_validate
| | | radeon_cs_parser_relocs
| | | radeon_cs_ioctl
| | | drm_ioctl
| | | do_vfs_ioctl
| | | sys_ioctl
| | | system_call_fastpath
| | | __GI___ioctl
| | | 0x7fff79e10b60
| | |
| | --44.85%-- ttm_bo_init
| | radeon_bo_create
| | radeon_gem_object_create
| | radeon_gem_create_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x0
| --0.03%-- [...]
--0.00%-- [...]
19.77% swapper [kernel.kallsyms] [k] read_hpet
|
--- read_hpet
|
|--55.44%-- ktime_get
| |
| |--42.84%-- tick_check_idle
| | irq_enter
| | |
| | |--97.87%-- smp_call_function_interrupt
| | | call_function_interrupt
| | | |
| | | |--99.97%-- cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | |
| | | | |--96.83%-- start_secondary
| | | | |
| | | | --3.17%-- rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | --0.03%-- [...]
| | |
| | |--0.92%-- scheduler_ipi
| | | smp_reschedule_interrupt
| | | reschedule_interrupt
| | | cpuidle_enter
| | | cpuidle_idle_call
| | | cpu_idle
| | | |
| | | |--81.42%-- start_secondary
| | | |
| | | --18.58%-- rest_init
| | | start_kernel
| | | x86_64_start_reservations
| | | x86_64_start_kernel
| | |
| | |--0.67%-- smp_apic_timer_interrupt
| | | apic_timer_interrupt
| | | |
| | | |--99.64%-- cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | start_secondary
| | | --0.36%-- [...]
| | |
| | |--0.54%-- do_IRQ
| | | ret_from_intr
| | | |
| | | |--96.93%-- cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | |
| | | --3.07%-- rest_init
| | | start_kernel
| | | x86_64_start_reservations
| | | x86_64_start_kernel
| | --0.01%-- [...]
| |
| |--37.64%-- __tick_nohz_idle_enter
| | |
| | |--97.66%-- tick_nohz_irq_exit
| | | irq_exit
| | | |
| | | |--98.26%-- smp_call_function_interrupt
| | | | call_function_interrupt
| | | | |
| | | | |--99.90%-- cpuidle_enter
| | | | | cpuidle_idle_call
| | | | | cpu_idle
| | | | | |
| | | | | |--96.37%-- start_secondary
| | | | | |
| | | | | --3.63%-- rest_init
| | | | | start_kernel
| | | | | x86_64_start_reservations
| | | | | x86_64_start_kernel
| | | | --0.10%-- [...]
| | | |
| | | |--1.30%-- scheduler_ipi
| | | | smp_reschedule_interrupt
| | | | reschedule_interrupt
| | | | cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | |
| | | | |--72.51%-- start_secondary
| | | | |
| | | | --27.49%-- rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | --0.44%-- [...]
| | |
| | --2.34%-- tick_nohz_idle_enter
| | cpu_idle
| | |
| | |--80.43%-- start_secondary
| | |
| | --19.57%-- rest_init
| | start_kernel
| | x86_64_start_reservations
| | x86_64_start_kernel
| |
| |--18.88%-- clockevents_program_event
| | |
| | |--97.54%-- tick_program_event
| | | |
| | | |--91.60%-- tick_broadcast_oneshot_control
| | | | tick_notify
| | | | notifier_call_chain
| | | | __raw_notifier_call_chain
| | | | raw_notifier_call_chain
| | | | clockevents_notify
| | | | intel_idle
| | | | cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | |
| | | | |--95.69%-- start_secondary
| | | | |
| | | | --4.31%-- rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | |
| | | |--3.75%-- hrtimer_force_reprogram
| | | | __remove_hrtimer
| | | | |
| | | | |--81.61%-- __hrtimer_start_range_ns
| | | | | hrtimer_start
| | | | | __tick_nohz_idle_enter
| | | | | |
| | | | | |--97.88%-- tick_nohz_idle_enter
| | | | | | cpu_idle
| | | | | | |
| | | | | | |--90.49%-- start_secondary
| | | | | | |
| | | | | | --9.51%-- rest_init
| | | | | | start_kernel
| | | | | | x86_64_start_reservations
| | | | | | x86_64_start_kernel
| | | | | |
| | | | | --2.12%-- tick_nohz_irq_exit
| | | | | irq_exit
| | | | | smp_apic_timer_interrupt
| | | | | apic_timer_interrupt
| | | | | cpuidle_enter
| | | | | cpuidle_idle_call
| | | | | cpu_idle
| | | | | start_secondary
| | | | |
| | | | --18.39%-- hrtimer_try_to_cancel
| | | | hrtimer_cancel
| | | | tick_nohz_idle_exit
| | | | cpu_idle
| | | | |
| | | | |--79.37%-- start_secondary
| | | | |
| | | | --20.63%-- rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | |
| | | |--2.50%-- __hrtimer_start_range_ns
| | | | |
| | | | |--97.44%-- hrtimer_start_range_ns
| | | | | tick_nohz_idle_exit
| | | | | cpu_idle
| | | | | |
| | | | | |--88.11%-- start_secondary
| | | | | |
| | | | | --11.89%-- rest_init
| | | | | start_kernel
| | | | | x86_64_start_reservations
| | | | | x86_64_start_kernel
| | | | |
| | | | --2.56%-- hrtimer_start
| | | | __tick_nohz_idle_enter
| | | | tick_nohz_idle_enter
| | | | cpu_idle
| | | | |
| | | | |--71.51%-- rest_init
| | | | | start_kernel
| | | | | x86_64_start_reservations
| | | | | x86_64_start_kernel
| | | | |
| | | | --28.49%-- start_secondary
| | | |
| | | --2.16%-- hrtimer_interrupt
| | | |
| | | |--94.36%-- smp_apic_timer_interrupt
| | | | apic_timer_interrupt
| | | | |
| | | | |--98.67%-- cpuidle_enter
| | | | | cpuidle_idle_call
| | | | | cpu_idle
| | | | | |
| | | | | |--98.84%-- start_secondary
| | | | | |
| | | | | --1.16%-- rest_init
| | | | | start_kernel
| | | | | x86_64_start_reservations
| | | | | x86_64_start_kernel
| | | | |
| | | | --1.33%-- call_softirq
| | | | do_softirq
| | | | irq_exit
| | | | scheduler_ipi
| | | | smp_reschedule_interrupt
| | | | reschedule_interrupt
| | | | cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | start_secondary
| | | |
| | | --5.64%-- tick_do_broadcast.constprop.3
| | | tick_handle_oneshot_broadcast
| | | timer_interrupt
| | | handle_irq_event_percpu
| | | handle_irq_event
| | | handle_edge_irq
| | | handle_irq
| | | do_IRQ
| | | ret_from_intr
| | | cpuidle_enter
| | | cpuidle_idle_call
| | | cpu_idle
| | | rest_init
| | | start_kernel
| | | x86_64_start_reservations
| | | x86_64_start_kernel
| | |
| | --2.46%-- tick_broadcast_set_event
| | |
| | |--79.48%-- tick_handle_oneshot_broadcast
| | | timer_interrupt
| | | handle_irq_event_percpu
| | | handle_irq_event
| | | handle_edge_irq
| | | handle_irq
| | | do_IRQ
| | | ret_from_intr
| | | |
| | | |--99.51%-- cpuidle_enter
| | | | cpuidle_idle_call
| | | | cpu_idle
| | | | rest_init
| | | | start_kernel
| | | | x86_64_start_reservations
| | | | x86_64_start_kernel
| | | --0.49%-- [...]
| | |
| | --20.52%-- tick_broadcast_oneshot_control
| | tick_notify
| | notifier_call_chain
| | __raw_notifier_call_chain
| | raw_notifier_call_chain
| | clockevents_notify
| | intel_idle
| | cpuidle_enter
| | cpuidle_idle_call
| | cpu_idle
| | |
| | |--86.53%-- start_secondary
| | |
| | --13.47%-- rest_init
| | start_kernel
| | x86_64_start_reservations
| | x86_64_start_kernel
| --0.64%-- [...]
|
|--44.04%-- getnstimeofday
| ktime_get_real
| |
| |--99.99%-- intel_idle
| | cpuidle_enter
| | cpuidle_idle_call
| | cpu_idle
| | |
| | |--95.13%-- start_secondary
| | |
| | --4.87%-- rest_init
| | start_kernel
| | x86_64_start_reservations
| | x86_64_start_kernel
| --0.01%-- [...]
--0.52%-- [...]
7.83% Xorg [kernel.kallsyms] [k] smp_call_function_many
|
--- smp_call_function_many
|
|--99.99%-- smp_call_function
| on_each_cpu
| |
| |--99.98%-- change_page_attr_set_clr
| | _set_pages_array
| | set_pages_array_wc
| | ttm_set_pages_caching
| | ttm_dma_populate
| | radeon_ttm_tt_populate
| | ttm_tt_bind
| | ttm_bo_handle_move_mem
| | ttm_bo_evict
| | ttm_mem_evict_first
| | ttm_bo_mem_space
| | ttm_bo_move_buffer
| | ttm_bo_validate
| | |
| | |--53.06%-- ttm_bo_init
| | | radeon_bo_create
| | | radeon_gem_object_create
| | | radeon_gem_create_ioctl
| | | drm_ioctl
| | | do_vfs_ioctl
| | | sys_ioctl
| | | system_call_fastpath
| | | __GI___ioctl
| | | 0x0
| | |
| | --46.94%-- radeon_bo_list_validate
| | radeon_cs_parser_relocs
| | radeon_cs_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x7fff79e10b60
| --0.02%-- [...]
--0.01%-- [...]
7.82% swapper [kernel.kallsyms] [k] intel_idle
|
--- intel_idle
|
|--99.92%-- cpuidle_enter
| cpuidle_idle_call
| cpu_idle
| |
| |--91.66%-- start_secondary
| |
| --8.34%-- rest_init
| start_kernel
| x86_64_start_reservations
| x86_64_start_kernel
--0.08%-- [...]
5.85% Xorg [kernel.kallsyms] [k] change_page_attr_set_clr
|
--- change_page_attr_set_clr
|
|--99.99%-- _set_pages_array
| set_pages_array_wc
| ttm_set_pages_caching
| ttm_dma_populate
| radeon_ttm_tt_populate
| ttm_tt_bind
| ttm_bo_handle_move_mem
| ttm_bo_evict
| ttm_mem_evict_first
| ttm_bo_mem_space
| ttm_bo_move_buffer
| ttm_bo_validate
| |
| |--56.21%-- ttm_bo_init
| | radeon_bo_create
| | radeon_gem_object_create
| | radeon_gem_create_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x0
| |
| --43.79%-- radeon_bo_list_validate
| radeon_cs_parser_relocs
| radeon_cs_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
| 0x7fff79e10b60
--0.01%-- [...]
0.64% Xorg [kernel.kallsyms] [k] apic_timer_interrupt
|
--- apic_timer_interrupt
|
|--94.99%-- physflat_send_IPI_allbutself
| native_send_call_func_ipi
| smp_call_function_many
| smp_call_function
| on_each_cpu
| change_page_attr_set_clr
| _set_pages_array
| set_pages_array_wc
| ttm_set_pages_caching
| ttm_dma_populate
| radeon_ttm_tt_populate
| ttm_tt_bind
| ttm_bo_handle_move_mem
| ttm_bo_evict
| ttm_mem_evict_first
| ttm_bo_mem_space
| ttm_bo_move_buffer
| ttm_bo_validate
| |
| |--56.82%-- radeon_bo_list_validate
| | radeon_cs_parser_relocs
| | radeon_cs_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x7fff79e10b60
| |
| --43.18%-- ttm_bo_init
| radeon_bo_create
| radeon_gem_object_create
| radeon_gem_create_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
| 0x0
|
|--4.04%-- smp_call_function
| on_each_cpu
| change_page_attr_set_clr
| _set_pages_array
| set_pages_array_wc
| ttm_set_pages_caching
| ttm_dma_populate
| radeon_ttm_tt_populate
| ttm_tt_bind
| ttm_bo_handle_move_mem
| ttm_bo_evict
| ttm_mem_evict_first
| ttm_bo_mem_space
| ttm_bo_move_buffer
| ttm_bo_validate
| |
| |--61.23%-- ttm_bo_init
| | radeon_bo_create
| | radeon_gem_object_create
| | radeon_gem_create_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x0
| |
| --38.77%-- radeon_bo_list_validate
| radeon_cs_parser_relocs
| radeon_cs_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
| 0x7fff79e10b60
|
|--0.77%-- _set_pages_array
| set_pages_array_wc
| ttm_set_pages_caching
| ttm_dma_populate
| radeon_ttm_tt_populate
| ttm_tt_bind
| ttm_bo_handle_move_mem
| ttm_bo_evict
| ttm_mem_evict_first
| ttm_bo_mem_space
| ttm_bo_move_buffer
| ttm_bo_validate
| |
| |--66.81%-- ttm_bo_init
| | radeon_bo_create
| | radeon_gem_object_create
| | radeon_gem_create_ioctl
| | drm_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call_fastpath
| | __GI___ioctl
| | 0x0
| |
| --33.19%-- radeon_bo_list_validate
| radeon_cs_parser_relocs
| radeon_cs_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
| 0x7fff79e10b60
--0.21%-- [...]
0.60% Xorg [kernel.kallsyms] [k] __purge_vmap_area_lazy
|
--- __purge_vmap_area_lazy
vm_unmap_aliases
change_page_attr_set_clr
_set_pages_array
set_pages_array_wc
ttm_set_pages_caching
ttm_dma_populate
radeon_ttm_tt_populate
ttm_tt_bind
ttm_bo_handle_move_mem
ttm_bo_evict
ttm_mem_evict_first
ttm_bo_mem_space
ttm_bo_move_buffer
ttm_bo_validate
|
|--56.35%-- ttm_bo_init
| radeon_bo_create
| radeon_gem_object_create
| radeon_gem_create_ioctl
| drm_ioctl
| do_vfs_ioctl
| sys_ioctl
| system_call_fastpath
| __GI___ioctl
| 0x0
|
--43.65%-- radeon_bo_list_validate
radeon_cs_parser_relocs
radeon_cs_ioctl
drm_ioctl
do_vfs_ioctl
sys_ioctl
system_call_fastpath
__GI___ioctl
0x7fff79e10b60
0.42% swapper [kernel.kallsyms] [k] getnstimeofday
|
--- getnstimeofday
|
|--95.17%-- ktime_get_real
| intel_idle
| cpuidle_enter
| cpuidle_idle_call
| cpu_idle
| |
| |--96.68%-- start_secondary
| |
| --3.32%-- rest_init
| start_kernel
| x86_64_start_reservations
| x86_64_start_kernel
|
--4.83%-- intel_idle
cpuidle_enter
cpuidle_idle_call
cpu_idle
|
|--95.26%-- start_secondary
|
--4.74%-- rest_init
start_kernel
x86_64_start_reservations
x86_64_start_kernel
View attachment ".config" of type "text/x-mpsub" (85128 bytes)
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