Hi guys:
env:
[root@cloudf ~]# uname -a
Linux cloudf.fedora.com 3.18.7-100.fc20.x86_64 #1 SMP Wed Feb 11
19:01:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[root@cloudf ~]# rpm -q qemu-kvm
qemu-kvm-1.6.2-13.fc20.x86_64
I found there is a "futex" thead after creating a kvm guest by the
command:"/usr/bin/qemu-system-x86_64 -machine accel=kvm -hda
/opt/todaygoods_SLES_11_SP3_JeOS.x86_64-0.0.2.raw -vnc 192.168.0.110:6"
root@cloudf task]# ps aux | grep qemu
root 13111 0.3 2.8 546760 227340 pts/3 S+ 18:26 0:12 gdb
qemu-system-x86_64
root 14379 85.2 2.0 699004 165496 pts/3 tl 18:49 31:12
/usr/bin/qemu-system-x86_64 -machine accel=kvm -hda
/opt/todaygoods_SLES_11_SP3_JeOS.x86_64-0.0.2.raw -vnc 192.168.0.110:6
the process 14379 has three threads, I'm familiar with the two of them
except the third thread (lwp :14418)
[root@cloudf 14379]# cd /proc/14379/
[root@cloudf 14379]# cat task/14
14379/ 14416/ 14418/
[root@cloudf 14379]# cat task/14379/stack
[<ffffffff8121d1e9>] poll_schedule_timeout+0x49/0x70
[<ffffffff8121e8e4>] do_sys_poll+0x484/0x5c0
[<ffffffff8121eb24>] SyS_poll+0x74/0x110
[<ffffffff8174cfa9>] system_call_fastpath+0x12/0x17
[<ffffffffffffffff>] 0xffffffffffffffff
[root@cloudf 14379]# cat task/14416/stack
[<ffffffffa05cf92d>] kvm_arch_vcpu_ioctl_run+0xb0d/0x1280 [kvm]
[<ffffffffa05b7bb2>] kvm_vcpu_ioctl+0x292/0x5c0 [kvm]
[<ffffffff8121c710>] do_vfs_ioctl+0x2e0/0x4a0
[<ffffffff8121c951>] SyS_ioctl+0x81/0xa0
[<ffffffff8174cfa9>] system_call_fastpath+0x12/0x17
[<ffffffffffffffff>] 0xffffffffffffffff
[root@cloudf 14379]# cat task/14418/stack
[<ffffffff8110b6e0>] futex_wait_queue_me+0xd0/0x130
[<ffffffff8110b9e6>] futex_wait+0x176/0x270
[<ffffffff8110dc7e>] do_futex+0x10e/0xac0
[<ffffffff8110e6b0>] SyS_futex+0x80/0x180
[<ffffffff8174cfa9>] system_call_fastpath+0x12/0x17
[<ffffffffffffffff>] 0xffffffffffffffff
what's the "futex" thread doing when create a kvm guest ? I deeped
into the qemu code , but I failed to find where call "futex" system call.
can you help me ?
--
-----------------------------------------------
Jun Hu
mobile:186 8035 6499
email :jhu_com@xxxxxxx
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