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Emilio G. Cota d3ada2feb5
tcg: allocate TB structs before the corresponding translated code 
Allocating an arbitrarily-sized array of tbs results in either
(a) a lot of memory wasted or (b) unnecessary flushes of the code
cache when we run out of TB structs in the array.

An obvious solution would be to just malloc a TB struct when needed,
and keep the TB array as an array of pointers (recall that tb_find_pc()
needs the TB array to run in O(log n)).

Perhaps a better solution, which is implemented in this patch, is to
allocate TB's right before the translated code they describe. This
results in some memory waste due to padding to have code and TBs in
separate cache lines--for instance, I measured 4.7% of padding in the
used portion of code_gen_buffer when booting aarch64 Linux on a
host with 64-byte cache lines. However, it can allow for optimizations
in some host architectures, since TCG backends could safely assume that
the TB and the corresponding translated code are very close to each
other in memory. See this message by rth for a detailed explanation:

https://lists.gnu.org/archive/html/qemu-devel/2017-03/msg05172.html
Subject: Re: GSoC 2017 Proposal: TCG performance enhancements

Backports commit 6e3b2bfd6af488a896f7936e99ef160f8f37e6f2 from qemu
2018-03-03 17:05:49 -05:00
..
crypto crypto: Clean up includes 2018-02-19 00:47:40 -05:00
default-configs arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
docs docs: clarify memory region lifecycle 2018-02-12 15:11:21 -05:00
fpu softfloat: define 680x0 specific values 2018-03-03 15:01:16 -05:00
hw i386: Remove AMD feature flag aliases from Opteron models 2018-03-01 23:49:04 -05:00
include tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
qapi qapi: Fix object input visit beyond end of list 2018-03-02 12:22:50 -05:00
qobject util/cutils: Rename qemu_strtoll(), qemu_strtoull() 2018-03-02 08:39:45 -05:00
qom qapi: Drop unused non-strict qobject input visitor 2018-03-02 12:14:52 -05:00
scripts qapi: rename QmpOutputVisitor to QObjectOutputVisitor 2018-02-27 08:05:33 -05:00
target target-m68k: define ext_opsize 2018-03-03 15:05:55 -05:00
tcg tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
util util: add cacheinfo 2018-03-03 16:58:28 -05:00
aarch64.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
aarch64eb.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
accel.c clean-up: removed duplicate #includes 2018-02-28 08:51:56 -05:00
arm.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
armeb.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
atomic_template.h tcg: Add atomic128 helpers 2018-02-27 21:43:48 -05:00
CODING_STYLE import 2015-08-21 15:04:50 +08:00
configure configure: remove Cygwin 2018-03-02 14:17:41 -05:00
COPYING import 2015-08-21 15:04:50 +08:00
COPYING.LIB import 2015-08-21 15:04:50 +08:00
cpu-exec-common.c tcg: Add EXCP_ATOMIC 2018-02-27 11:57:58 -05:00
cpu-exec.c tcg: Introduce goto_ptr opcode and tcg_gen_lookup_and_goto_ptr 2018-03-02 21:05:18 -05:00
cpus.c tcg: handle EXCP_ATOMIC exception for system emulation 2018-03-02 09:56:43 -05:00
cputlb.c cputlb: handle first atomic write to the page 2018-03-02 18:59:12 -05:00
exec.c exec: simplify phys_page_find() params 2018-03-03 14:28:25 -05:00
gen_all_header.sh arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
glib_compat.c qapi: Improve qobject input visitor error reporting 2018-03-02 12:05:53 -05:00
HACKING import 2015-08-21 15:04:50 +08:00
header_gen.py tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
ioport.c hw: remove pio_addr_t 2018-02-24 02:43:16 -05:00
LICENSE import 2015-08-21 15:04:50 +08:00
m68k.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
Makefile Makefile: Add a FORCE target 2018-02-24 17:03:51 -05:00
Makefile.objs tcg: Add atomic helpers 2018-02-27 15:57:47 -05:00
Makefile.target Move target-* CPU file into a target/ folder 2018-03-01 22:50:58 -05:00
memory.c memory: Introduce DEVICE_HOST_ENDIAN for ram device 2018-03-02 11:24:32 -05:00
memory_ldst.inc.c exec: introduce memory_ldst.inc.c 2018-03-01 09:59:34 -05:00
memory_mapping.c include/qemu/osdep.h: Don't include qapi/error.h 2018-02-21 23:08:18 -05:00
mips.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
mips64.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
mips64el.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
mipsel.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
powerpc.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
qapi-schema.json qapi: add missing colon-ending for section name 2018-03-01 09:07:10 -05:00
qemu-timer.c timer/cpus: fix some typos and update some comments 2018-02-25 23:21:57 -05:00
rules.mak rules.mak: Don't extract libs from .mo-libs in link command 2018-02-26 02:08:03 -05:00
softmmu_template.h cputlb: Remove includes from softmmu_template.h 2018-02-27 12:40:43 -05:00
sparc.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
sparc64.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
tcg-runtime.c tcg: Introduce goto_ptr opcode and tcg_gen_lookup_and_goto_ptr 2018-03-02 21:05:18 -05:00
translate-all.c tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00
translate-all.h translate-all.c: Compute L1 page table properties at runtime 2018-02-26 11:46:58 -05:00
translate-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
unicorn_common.h qom/cpu: Add MemoryRegion property 2018-02-18 21:54:50 -05:00
VERSION import 2015-08-21 15:04:50 +08:00
vl.c util: add cacheinfo 2018-03-03 16:58:28 -05:00
vl.h import 2015-08-21 15:04:50 +08:00
x86_64.h tcg: allocate TB structs before the corresponding translated code 2018-03-03 17:05:49 -05:00