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memory: Don't call memory_region_update_coalesced_range if nothing changed

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With huge number of PCI devices in the system (for example, 200
virtio-blk-pci), this unconditional call can slow down emulation of
irrelevant PCI operations drastically, such as a BAR update on a device
that has no coalescing region. So avoid it.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2014-06-13 14:34:41 +08:00 committed by Paolo Bonzini
parent feca4ac18b
commit ab5b3db5d7
1 changed files with 6 additions and 1 deletions
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7
memory.c
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@ -1332,6 +1332,7 @@ void memory_region_add_coalescing(MemoryRegion *mr,
void memory_region_clear_coalescing(MemoryRegion *mr)
{
CoalescedMemoryRange *cmr;
bool updated = false;
qemu_flush_coalesced_mmio_buffer();
mr->flush_coalesced_mmio = false;
@ -1340,8 +1341,12 @@ void memory_region_clear_coalescing(MemoryRegion *mr)
cmr = QTAILQ_FIRST(&mr->coalesced);
QTAILQ_REMOVE(&mr->coalesced, cmr, link);
g_free(cmr);
updated = true;
}
if (updated) {
memory_region_update_coalesced_range(mr);
}
memory_region_update_coalesced_range(mr);
}
void memory_region_set_flush_coalesced(MemoryRegion *mr)