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[Qemu-devel] Get the dirty bitmap of a whole VM
From: |
Vincent KHERBACHE |
Subject: |
[Qemu-devel] Get the dirty bitmap of a whole VM |
Date: |
Thu, 13 Feb 2014 18:06:59 +0100 |
Hi all,
I'm trying to calculate the dirty bytes rate of a VM by traveling the
corresponding memory dirty bitmaps.
I get a bitmap from KVM kernel space using the following ioctl call :
kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d);
Also, I'm getting the bitmap for each memory slot inside the KVMState
object, but I obtain strange results..
I reused some code from the 'kvm_physical_sync_dirty_bitmap' function
but I wonder if I should really use each available memory slot ? or if
there is a way to obtain the whole 'MemoryRegionSection' of a VM ?
For instance, there is roughly what I do :
/******************************/
KVMState *s = kvm_state;
KVMDirtyLog d;
for (int i=0; i <=; i++) {
if (&s->slots[i]->memory_size > 0) {
d.slot = &s->slots[i]->slot;
kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d);
}
}
/******************************/
Any help/advice would be welcome.
Thanks,
--
Vincent KHERBACHE
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