72db6d54a4
This plugin uses the new time control interface to make decisions about the state of time during the emulation. The algorithm is currently very simple. The user specifies an ips rate which applies per core. If the core runs ahead of its allocated execution time the plugin sleeps for a bit to let real time catch up. Either way time is updated for the emulation as a function of total executed instructions with some adjustments for cores that idle. Examples -------- Slow down execution of /bin/true: $ num_insn=$(./build/qemu-x86_64 -plugin ./build/tests/plugin/libinsn.so -d plugin /bin/true |& grep total | sed -e 's/.*: //') $ time ./build/qemu-x86_64 -plugin ./build/contrib/plugins/libips.so,ips=$(($num_insn/4)) /bin/true real 4.000s Boot a Linux kernel simulating a 250MHz cpu: $ /build/qemu-system-x86_64 -kernel /boot/vmlinuz-6.1.0-21-amd64 -append "console=ttyS0" -plugin ./build/contrib/plugins/libips.so,ips=$((250*1000*1000)) -smp 1 -m 512 check time until kernel panic on serial0 Tested in system mode by booting a full debian system, and using: $ sysbench cpu run Performance decrease linearly with the given number of ips. Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-Id: <20240530220610.1245424-7-pierrick.bouvier@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20240620152220.2192768-11-alex.bennee@linaro.org>
70 lines
1.5 KiB
Makefile
70 lines
1.5 KiB
Makefile
# -*- Mode: makefile -*-
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#
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# This Makefile example is fairly independent from the main makefile
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# so users can take and adapt it for their build. We only really
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# include config-host.mak so we don't have to repeat probing for
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# programs that the main configure has already done for us.
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#
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include config-host.mak
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TOP_SRC_PATH = $(SRC_PATH)/../..
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VPATH += $(SRC_PATH)
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NAMES :=
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NAMES += execlog
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NAMES += hotblocks
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NAMES += hotpages
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NAMES += howvec
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# The lockstep example communicates using unix sockets,
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# and can't be easily made to work on windows.
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ifneq ($(CONFIG_WIN32),y)
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NAMES += lockstep
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endif
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NAMES += hwprofile
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NAMES += cache
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NAMES += drcov
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NAMES += ips
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ifeq ($(CONFIG_WIN32),y)
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SO_SUFFIX := .dll
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LDLIBS += $(shell $(PKG_CONFIG) --libs glib-2.0)
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else
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SO_SUFFIX := .so
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endif
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SONAMES := $(addsuffix $(SO_SUFFIX),$(addprefix lib,$(NAMES)))
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# The main QEMU uses Glib extensively so it's perfectly fine to use it
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# in plugins (which many example do).
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PLUGIN_CFLAGS := $(shell $(PKG_CONFIG) --cflags glib-2.0)
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PLUGIN_CFLAGS += -fPIC -Wall
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PLUGIN_CFLAGS += -I$(TOP_SRC_PATH)/include/qemu
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all: $(SONAMES)
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%.o: %.c
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$(CC) $(CFLAGS) $(PLUGIN_CFLAGS) -c -o $@ $<
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ifeq ($(CONFIG_WIN32),y)
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lib%$(SO_SUFFIX): %.o win32_linker.o ../../plugins/libqemu_plugin_api.a
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$(CC) -shared -o $@ $^ $(LDLIBS)
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else ifeq ($(CONFIG_DARWIN),y)
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lib%$(SO_SUFFIX): %.o
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$(CC) -bundle -Wl,-undefined,dynamic_lookup -o $@ $^ $(LDLIBS)
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else
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lib%$(SO_SUFFIX): %.o
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$(CC) -shared -o $@ $^ $(LDLIBS)
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endif
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clean:
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rm -f *.o *$(SO_SUFFIX) *.d
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rm -Rf .libs
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.PHONY: all clean
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.SECONDARY:
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