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[Qemu-devel] [PULL 07/21] kvm: skip system call when msi route is unchan
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 07/21] kvm: skip system call when msi route is unchanged |
Date: |
Thu, 20 Jun 2013 16:10:25 +0300 |
Some guests do a large number of mask/unmask
calls which currently trigger expensive route update
system calls.
Detect that route in unchanged and skip the system call.
Reported-by: "Zhanghaoyu (A)" <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
kvm-all.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kvm-all.c b/kvm-all.c
index f119ce1..891722b 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1026,6 +1026,10 @@ static int kvm_update_routing_entry(KVMState *s,
continue;
}
+ if(!memcmp(entry, new_entry, sizeof *entry)) {
+ return 0;
+ }
+
*entry = *new_entry;
kvm_irqchip_commit_routes(s);
--
MST
- [Qemu-devel] [PULL 00/21] pci,net,misc enhancements, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 01/21] range: add Range structure, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 03/21] pc: pass PCI hole ranges to Guests, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 04/21] pc_piix: cleanup init compat handling, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 05/21] e1000: cleanup process_tx_desc, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 06/21] kvm: zero-initialize KVM_SET_GSI_ROUTING input, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 07/21] kvm: skip system call when msi route is unchanged,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 08/21] MAINTAINERS: s/Marcelo/Paolo/, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 09/21] pvpanic: initialization cleanup, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 10/21] pvpanic: fix fwcfg for big endian hosts, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 13/21] pci: Move pci_read_devaddr to pci-hotplug-old.c, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 14/21] pci: Abolish pci_find_root_bus(), Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 15/21] pci: Use helper to find device's root bus in pci_find_domain(), Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 16/21] pci: Replace pci_find_domain() with more general pci_root_bus_path(), Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 17/21] pci: Add root bus argument to pci_get_bus_devfn(), Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 19/21] pci: Simpler implementation of primary PCI bus, Michael S. Tsirkin, 2013/06/20
- [Qemu-devel] [PULL 20/21] pci: Remove domain from PCIHostBus, Michael S. Tsirkin, 2013/06/20