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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-all.h | ||
cpu-common.h | ||
cpu-defs.h | ||
cpu_ldst.h | ||
cpu_ldst_template.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 |