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[Xen-devel] Re: [Qemu-devel] [PATCH] xen: Avoid useless allocation in Xe
| To: | Jan Kiszka <jan.kiszka@xxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [Qemu-devel] [PATCH] xen: Avoid useless allocation in Xen case. |
| From: | Anthony PERARD <anthony.perard@xxxxxxxxxx> |
| Date: | Tue, 2 Aug 2011 13:13:26 +0100 |
| Cc: | Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Alexander Graf <agraf@xxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, QEMU-devel <qemu-devel@xxxxxxxxxx> |
| Delivery-date: | Tue, 02 Aug 2011 05:16:07 -0700 |
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On Tue, Aug 2, 2011 at 11:49, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: >> The same applies to kvm, please generalize. > > Actually, qemu-kvm avoids this overhead today by making code_gen_alloc > return immediately when kvm is on. Also not very beautiful. > > Can't we simply skip cpu_exec_init_all for any accel != TCG, e.g. by > moving that call to tcg_init? In the function cpu_exec_init_all(), the call to cpu_gen_init() (and I suppose to io_mem_init()) is still required. So we can not move the whole function to tcg_init(). But I can maybe use "if (!tcg_enabled())" instead of a check to xen. Until no tcg code is use when kvm/xen is enabled. -- Anthony PERARD _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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