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From 67f736a89722dcaa425c70510c080e95216a165f Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Thu, 19 Jun 2014 10:21:56 +0200
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Subject: [PATCH 11/13] memory: Don't call memory_region_update_coalesced_range if nothing changed
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1403173316-12035-1-git-send-email-famz@redhat.com>
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Patchwork-id: 59289
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O-Subject: [RHEL-7.1/7.0.z qemu-kvm PATCH] memory: Don't call memory_region_update_coalesced_range if nothing changed
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Bugzilla: 1096645
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RH-Acked-by: Amos Kong <akong@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=7596269
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1096645
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With huge number of PCI devices in the system (for example, 200
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virtio-blk-pci), this unconditional call can slow down emulation of
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irrelevant PCI operations drastically, such as a BAR update on a device
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that has no coalescing region. So avoid it.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit ab5b3db5d711b290d63e954dc64647dd51cef962)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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---
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memory.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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memory.c | 7 ++++++-
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1 files changed, 6 insertions(+), 1 deletions(-)
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diff --git a/memory.c b/memory.c
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index edaf6fd..a71d096 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -1210,6 +1210,7 @@ void memory_region_add_coalescing(MemoryRegion *mr,
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void memory_region_clear_coalescing(MemoryRegion *mr)
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{
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CoalescedMemoryRange *cmr;
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+ bool updated = false;
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qemu_flush_coalesced_mmio_buffer();
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mr->flush_coalesced_mmio = false;
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@@ -1218,8 +1219,12 @@ void memory_region_clear_coalescing(MemoryRegion *mr)
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cmr = QTAILQ_FIRST(&mr->coalesced);
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QTAILQ_REMOVE(&mr->coalesced, cmr, link);
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g_free(cmr);
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+ updated = true;
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+ }
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+
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+ if (updated) {
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+ memory_region_update_coalesced_range(mr);
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}
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- memory_region_update_coalesced_range(mr);
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}
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void memory_region_set_flush_coalesced(MemoryRegion *mr)
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--
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1.7.1
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