From: Andi Kleen <ak@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: qemu polling KVM_IRQ_LINE_STATUS when stopped
Date: Wed, 18 Oct 2017 10:49:46 -0700 [thread overview]
Message-ID: <20171018174946.GU5109@tassilo.jf.intel.com> (raw)
In-Reply-To: <1ffc9cf7-a81c-6eeb-4823-c6e0ef53d3af@redhat.com>
> Because the polling time is zero here, and fd=7 has POLLIN, it seems
> that QEMU is continuously scheduling a callback (a timer with a deadline
> in the past, or a bottom half). Can you perhaps attach gdb and see what
> callback it is?
There seem to be multiple.
The ioctl appears to be the PIC timer
- 6.36% __GI___ioctl ▒
kvm_vm_ioctl ▒
kvm_set_irq ▒
kvm_pic_set_irq
It does something with glib (windows are all closed BTW)
- 2.83% libglib-2.0.so.0.5200.3 [.] g_main_context_check ▒
- 2.81% g_main_context_check ▒
- 2.60% main_loop_wait ▒
main ▒
__libc_start_main ▒
_start
And some AIO is going on, not sure what triggers that.
1.96% aio_ctx_check ▒
-Andi
next prev parent reply other threads:[~2017-10-18 17:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-17 21:34 qemu polling KVM_IRQ_LINE_STATUS when stopped Andi Kleen
2017-10-18 7:47 ` Paolo Bonzini
2017-10-18 17:49 ` Andi Kleen [this message]
2017-10-18 19:24 ` Paolo Bonzini
2017-10-20 0:34 ` Andi Kleen
2017-10-20 8:32 ` Paolo Bonzini
2017-10-20 14:09 ` Andi Kleen
2017-10-20 15:12 ` Paolo Bonzini
2017-10-20 20:50 ` Andi Kleen
2017-10-20 22:51 ` Paolo Bonzini
2020-06-25 14:26 ` Kevin Locke
2020-06-25 16:28 ` Andi Kleen
2020-06-25 18:41 ` Paolo Bonzini
2020-06-25 18:56 ` Kevin Locke
2020-06-25 19:17 ` Paolo Bonzini
2020-06-25 20:10 ` Kevin Locke
2020-06-26 15:14 ` Kevin Locke
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