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[Xen-users] how to disable batching of page table entries updates for gu
| To: | xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-users] how to disable batching of page table entries updates for guest OS |
| From: | Qiang Zeng <zengqiang.buaa@xxxxxxxxx> |
| Date: | Sun, 8 May 2011 22:27:28 -0400 |
| Delivery-date: | Sun, 08 May 2011 19:28:31 -0700 |
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Xen has a perf. enhancement by batching page table updates for the guest OS. I'm trying to measure the impact on the guest OS's performance, when this enhancement is disabled. But I don't know how to disable it. I tried modifying do_mmu_update in xen/arch/x86/mm.c, which is to process the batch of page table updates requested by the guest OS. I simply limit it to only process one update:
However, after I install this version, there is a kernel panic. An alternative may be to modify the code in the paravirtualized guest OS code, but I prefer to change xen code. Or do I HAVE to change the OS code rather than xen? Could somebody provide some hints? Thanks! Qiang. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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