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b90333a531
This shares an cached empty FlatView among address spaces. The empty
FV is used every time when a root MR renders into a FV without memory
sections which happens when MR or its children are not enabled or
zero-sized. The empty_view is not NULL to keep the rest of memory
API intact; it also has a dispatch tree for the same reason.
On POWER8 with 255 CPUs, 255 virtio-net, 40 PCI bridges guest this halves
the amount of FlatView's in use (557 -> 260) and dispatch tables
(~800000 -> ~370000). In an unrelated experiment with 112 non-virtio
devices on x86 ("-M pc"), only 4 FlatViews are alive, and about ~2000
are created at startup.
Backports commit 092aa2fc65b7a35121616aad8f39d47b8f921618 from qemu
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| .. | ||
| address-spaces.h | ||
| cpu_ldst_template.h | ||
| cpu_ldst.h | ||
| cpu-all.h | ||
| cpu-common.h | ||
| cpu-defs.h | ||
| cputlb.h | ||
| exec-all.h | ||
| gen-icount.h | ||
| helper-gen.h | ||
| helper-head.h | ||
| helper-proto.h | ||
| helper-tcg.h | ||
| hwaddr.h | ||
| ioport.h | ||
| memattrs.h | ||
| memory-internal.h | ||
| memory.h | ||
| ram_addr.h | ||
| ramlist.h | ||
| semihost.h | ||
| tb-context.h | ||
| tb-hash-xx.h | ||
| tb-hash.h | ||
| tb-lookup.h | ||
| translator.h | ||