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[Qemu-devel] [Bug 1236809] [NEW] qemu-system-x86_64 takes 100% CPU
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From: |
chenlidong |
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Subject: |
[Qemu-devel] [Bug 1236809] [NEW] qemu-system-x86_64 takes 100% CPU |
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Date: |
Tue, 08 Oct 2013 11:51:19 -0000 |
Public bug reported:
I have rhel6 inside qemu VM. qemu process starts to take CPU cycles and
OS inside VM is very slow and sluggish.
the qemu version is the latest upstream git.
the kernel version is 3.12.0.
linux-0rsg:/home/chenlidong # uname -a
Linux linux-0rsg 3.12.0-rc1-1.16-desktop+ #5 SMP PREEMPT Sun Sep 22 22:07:40
EDT 2013 x86_64 x86_64 x86_64 GNU/Linux
linux-0rsg:/home/chenlidong # qemu-system-x86_64 --version
QEMU emulator version 1.6.50, Copyright (c) 2003-2008 Fabrice Bellard
the command line of qemu is below:
address@hidden:~/develop/qemu> ps -ef | grep qemu
root 19030 1 14 19:00 ? 00:04:24
/usr/local/bin/qemu-system-x86_64 -name rhel6 -S -M pc-i440fx-1.6 -m 2048 -smp
1,sockets=1,cores=1,threads=1 -uuid 1925a96a-54b9-3c4a-dda0-6b42fdd0af2c
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/rhel6.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/var/lib/libvirt/images/rhel6.img,if=none,id=drive-ide0-0-0,format=raw,cache=directsync
-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=2
-drive if=none,id=drive-ide0-1-0,readonly=on,format=raw -device
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev
tap,fd=21,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:b3:b8:53,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device
intel-hda,id=sound0,bus=pci.0,addr=0x4 -device
hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
i used perf top, the result is below:
Samples: 57K of event 'cycles', Event count (approx.): 26336443124
15.38% perf-22465.map [.] 0x00007f143b99c9c6
5.90% qemu-system-x86_64 [.] phys_page_find
4.48% qemu-system-x86_64 [.] address_space_translate_internal
3.30% qemu-system-x86_64 [.] compute_all_subw
3.15% qemu-system-x86_64 [.] check_regs
2.56% qemu-system-x86_64 [.] tb_find_fast
2.34% qemu-system-x86_64 [.] tb_find_slow
2.16% qemu-system-x86_64 [.] cpu_x86_handle_mmu_fault
2.05% qemu-system-x86_64 [.] address_space_lookup_region
1.66% qemu-system-x86_64 [.] cpu_x86_exec
1.55% qemu-system-x86_64 [.] address_space_translate
1.54% qemu-system-x86_64 [.] lshift
1.29% qemu-system-x86_64 [.] int128_make64
1.27% qemu-system-x86_64 [.] helper_cc_compute_all
1.23% qemu-system-x86_64 [.] memory_region_is_ram
1.23% qemu-system-x86_64 [.] int128_sub
1.22% qemu-system-x86_64 [.] cpu_get_tb_cpu_state
1.19% qemu-system-x86_64 [.] lduw_p
1.17% qemu-system-x86_64 [.] tcg_constant_folding
1.16% qemu-system-x86_64 [.] ldq_phys_internal
1.09% qemu-system-x86_64 [.] int128_min
1.08% qemu-system-x86_64 [.] tlb_set_page
1.02% qemu-system-x86_64 [.] ldq_p
0.90% qemu-system-x86_64 [.] tb_jmp_cache_hash_func
0.79% qemu-system-x86_64 [.] cpu_tb_exec
0.77% qemu-system-x86_64 [.] qemu_get_ram_ptr
0.75% qemu-system-x86_64 [.] helper_ret_lduw_mmu
0.75% qemu-system-x86_64 [.] qemu_get_ram_block
0.67% qemu-system-x86_64 [.] tcg_liveness_analysis
0.67% qemu-system-x86_64 [.] int128_get64
0.66% qemu-system-x86_64 [.] tcg_reg_alloc_op
0.66% qemu-system-x86_64 [.] reset_all_temps
0.64% qemu-system-x86_64 [.] int128_ge
0.61% qemu-system-x86_64 [.] tcg_out_opc
0.59% qemu-system-x86_64 [.] qemu_loglevel_mask
0.54% qemu-system-x86_64 [.] int128_le
0.53% qemu-system-x86_64 [.] tcg_out8
0.52% qemu-system-x86_64 [.] ldq_le_p
0.48% qemu-system-x86_64 [.] xen_enabled
0.47% qemu-system-x86_64 [.] ldq_phys
0.46% qemu-system-x86_64 [.] memory_access_is_direct
0.44% qemu-system-x86_64 [.] memory_region_section_get_iotlb
0.44% qemu-system-x86_64 [.] memory_region_get_ram_addr
0.44% qemu-system-x86_64 [.] tcg_gen_code_common
0.43% qemu-system-x86_64 [.]
cpu_physical_memory_get_dirty_flags
in most time, the funcation tb_find_slow used most cpu resource. and i
used gdb print the stack.
(gdb) bt
#0 0x00007f54128cff5d in tb_find_slow (env=0x7f5413a1d0c0, pc=140192155492023,
cs_base=0, flags=4246199) at /home/chenlidong/develop/qemu/cpu-exec.c:124
#1 0x00007f54128d0199 in tb_find_fast (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpu-exec.c:172
#2 0x00007f54128d0950 in cpu_x86_exec (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpu-exec.c:599
#3 0x00007f54128d39d8 in tcg_cpu_exec (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpus.c:1183
#4 0x00007f54128d3aef in tcg_exec_all () at
/home/chenlidong/develop/qemu/cpus.c:1216
#5 0x00007f54128d2ebc in qemu_tcg_cpu_thread_fn (arg=0x7f5413a1cf80) at
/home/chenlidong/develop/qemu/cpus.c:882
#6 0x00007f541047de0f in start_thread () from /lib64/libpthread.so.0
#7 0x00007f54101b17dd in clone () from /lib64/libc.so.6
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1236809
Title:
qemu-system-x86_64 takes 100% CPU
Status in QEMU:
New
Bug description:
I have rhel6 inside qemu VM. qemu process starts to take CPU cycles
and OS inside VM is very slow and sluggish.
the qemu version is the latest upstream git.
the kernel version is 3.12.0.
linux-0rsg:/home/chenlidong # uname -a
Linux linux-0rsg 3.12.0-rc1-1.16-desktop+ #5 SMP PREEMPT Sun Sep 22 22:07:40
EDT 2013 x86_64 x86_64 x86_64 GNU/Linux
linux-0rsg:/home/chenlidong # qemu-system-x86_64 --version
QEMU emulator version 1.6.50, Copyright (c) 2003-2008 Fabrice Bellard
the command line of qemu is below:
address@hidden:~/develop/qemu> ps -ef | grep qemu
root 19030 1 14 19:00 ? 00:04:24
/usr/local/bin/qemu-system-x86_64 -name rhel6 -S -M pc-i440fx-1.6 -m 2048 -smp
1,sockets=1,cores=1,threads=1 -uuid 1925a96a-54b9-3c4a-dda0-6b42fdd0af2c
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/rhel6.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/var/lib/libvirt/images/rhel6.img,if=none,id=drive-ide0-0-0,format=raw,cache=directsync
-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=2
-drive if=none,id=drive-ide0-1-0,readonly=on,format=raw -device
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=1 -netdev
tap,fd=21,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:b3:b8:53,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device
intel-hda,id=sound0,bus=pci.0,addr=0x4 -device
hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
i used perf top, the result is below:
Samples: 57K of event 'cycles', Event count (approx.): 26336443124
15.38% perf-22465.map [.] 0x00007f143b99c9c6
5.90% qemu-system-x86_64 [.] phys_page_find
4.48% qemu-system-x86_64 [.] address_space_translate_internal
3.30% qemu-system-x86_64 [.] compute_all_subw
3.15% qemu-system-x86_64 [.] check_regs
2.56% qemu-system-x86_64 [.] tb_find_fast
2.34% qemu-system-x86_64 [.] tb_find_slow
2.16% qemu-system-x86_64 [.] cpu_x86_handle_mmu_fault
2.05% qemu-system-x86_64 [.] address_space_lookup_region
1.66% qemu-system-x86_64 [.] cpu_x86_exec
1.55% qemu-system-x86_64 [.] address_space_translate
1.54% qemu-system-x86_64 [.] lshift
1.29% qemu-system-x86_64 [.] int128_make64
1.27% qemu-system-x86_64 [.] helper_cc_compute_all
1.23% qemu-system-x86_64 [.] memory_region_is_ram
1.23% qemu-system-x86_64 [.] int128_sub
1.22% qemu-system-x86_64 [.] cpu_get_tb_cpu_state
1.19% qemu-system-x86_64 [.] lduw_p
1.17% qemu-system-x86_64 [.] tcg_constant_folding
1.16% qemu-system-x86_64 [.] ldq_phys_internal
1.09% qemu-system-x86_64 [.] int128_min
1.08% qemu-system-x86_64 [.] tlb_set_page
1.02% qemu-system-x86_64 [.] ldq_p
0.90% qemu-system-x86_64 [.] tb_jmp_cache_hash_func
0.79% qemu-system-x86_64 [.] cpu_tb_exec
0.77% qemu-system-x86_64 [.] qemu_get_ram_ptr
0.75% qemu-system-x86_64 [.] helper_ret_lduw_mmu
0.75% qemu-system-x86_64 [.] qemu_get_ram_block
0.67% qemu-system-x86_64 [.] tcg_liveness_analysis
0.67% qemu-system-x86_64 [.] int128_get64
0.66% qemu-system-x86_64 [.] tcg_reg_alloc_op
0.66% qemu-system-x86_64 [.] reset_all_temps
0.64% qemu-system-x86_64 [.] int128_ge
0.61% qemu-system-x86_64 [.] tcg_out_opc
0.59% qemu-system-x86_64 [.] qemu_loglevel_mask
0.54% qemu-system-x86_64 [.] int128_le
0.53% qemu-system-x86_64 [.] tcg_out8
0.52% qemu-system-x86_64 [.] ldq_le_p
0.48% qemu-system-x86_64 [.] xen_enabled
0.47% qemu-system-x86_64 [.] ldq_phys
0.46% qemu-system-x86_64 [.] memory_access_is_direct
0.44% qemu-system-x86_64 [.] memory_region_section_get_iotlb
0.44% qemu-system-x86_64 [.] memory_region_get_ram_addr
0.44% qemu-system-x86_64 [.] tcg_gen_code_common
0.43% qemu-system-x86_64 [.]
cpu_physical_memory_get_dirty_flags
in most time, the funcation tb_find_slow used most cpu resource. and i
used gdb print the stack.
(gdb) bt
#0 0x00007f54128cff5d in tb_find_slow (env=0x7f5413a1d0c0,
pc=140192155492023, cs_base=0, flags=4246199) at
/home/chenlidong/develop/qemu/cpu-exec.c:124
#1 0x00007f54128d0199 in tb_find_fast (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpu-exec.c:172
#2 0x00007f54128d0950 in cpu_x86_exec (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpu-exec.c:599
#3 0x00007f54128d39d8 in tcg_cpu_exec (env=0x7f5413a1d0c0) at
/home/chenlidong/develop/qemu/cpus.c:1183
#4 0x00007f54128d3aef in tcg_exec_all () at
/home/chenlidong/develop/qemu/cpus.c:1216
#5 0x00007f54128d2ebc in qemu_tcg_cpu_thread_fn (arg=0x7f5413a1cf80) at
/home/chenlidong/develop/qemu/cpus.c:882
#6 0x00007f541047de0f in start_thread () from /lib64/libpthread.so.0
#7 0x00007f54101b17dd in clone () from /lib64/libc.so.6
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