9a05aa7fc4
22707-x2apic-preenabled-check.patch - bnc#641419 - L3: Xen: qemu-dm reports "xc_map_foreign_batch: mmap failed: Cannot allocate memory" 7434-qemu-rlimit-as.patch - Additional or upstream patches from Jan 22693-fam10-mmio-conf-base-protect.patch 22694-x86_64-no-weak.patch 22708-xenctx-misc.patch 21432-4.0-cpu-boot-failure.patch 22645-amd-flush-filter.patch qemu-fix-7433.patch - Maintain compatibility with the extid flag even though it is deprecated for both legacy and sxp config files. hv_extid_compatibility.patch - bnc#649209-improve suspend eventchn lock suspend_evtchn_lock.patch - Removed the hyper-v shim patches in favor of using the upstream version. - bnc#641419 - L3: Xen: qemu-dm reports "xc_map_foreign_batch: mmap failed: Cannot allocate memory" qemu-rlimit-as.patch - Upstream c/s 7433 to replace qemu_altgr_more.patch 7433-qemu-altgr.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=90
47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
Subject: xenpaging: optimize p2m_mem_paging_populate
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p2m_mem_paging_populate will always put another request in the ring. To
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reduce pressure on the ring, place only required requests in the ring.
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If the gfn was already processed by another thread, and the current vcpu
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does not need to be paused, p2m_mem_paging_resume will do nothing with
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the request. And also xenpaging will drop the request if the vcpu does
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not need a wakeup.
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(xen-unstable changeset: 22444:7fe9cad00e15)
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Signed-off-by: Olaf Hering <olaf@aepfle.de>
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---
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xen/arch/x86/mm/p2m.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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--- xen-4.0.1-testing.orig/xen/arch/x86/mm/p2m.c
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+++ xen-4.0.1-testing/xen/arch/x86/mm/p2m.c
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@@ -2567,12 +2567,12 @@ void p2m_mem_paging_populate(struct doma
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mem_event_request_t req;
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p2m_type_t p2mt;
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- memset(&req, 0, sizeof(req));
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-
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/* Check that there's space on the ring for this request */
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if ( mem_event_check_ring(d) )
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return;
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+ memset(&req, 0, sizeof(req));
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+
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/* Fix p2m mapping */
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/* XXX: It seems inefficient to have this here, as it's only needed
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* in one case (ept guest accessing paging out page) */
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@@ -2590,6 +2590,11 @@ void p2m_mem_paging_populate(struct doma
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vcpu_pause_nosync(v);
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req.flags |= MEM_EVENT_FLAG_VCPU_PAUSED;
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}
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+ else if ( p2mt != p2m_ram_paging_out && p2mt != p2m_ram_paged )
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+ {
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+ /* gfn is already on its way back and vcpu is not paused */
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+ return;
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+ }
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/* Send request to pager */
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req.gfn = gfn;
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