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Message-ID: <CAH3drwZ-Wc=PViwuj=PgcOrsZBfvozdZRK=Q2Q-uJFktSbGQcw@mail.gmail.com>
Date: Mon, 17 Sep 2012 04:47:10 -0400
From: Jerome Glisse <j.glisse@...il.com>
To: Andres Freund <andres@...razel.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
David Airlie <airlied@...ux.ie>,
Jerome Glisse <jglisse@...hat.com>,
Alex Deucher <alexander.deucher@....com>
Subject: Re: Excessive kernel time inside ttm when scrolling on a r700 in a
multimonitor setup
On Sun, Sep 16, 2012 at 7:18 PM, Andres Freund <andres@...razel.de> wrote:
> 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:
Is it an AGP card ? It looks like it's the PAT update that kills perf
for you, not much we can do, the pool allocator is probably starve.
Cheers,
Jerome
> 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
--
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