riscv/qemu: QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org - qemu

QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org

emulation kvm qemu virtualization

History

Pierrick Bouvier 72db6d54a4 contrib/plugins: add Instructions Per Second (IPS) example for cost modeling 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=$((2501000*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>		2 years ago
..
elf2dmp	contrib/elf2dmp: Ensure phdrs fit in file	2 years ago
gitdm	contrib/gitdm: add Daynix to domain-map	2 years ago
ivshmem-client	configure, meson: rename targetos to host_os	2 years ago
ivshmem-server	configure, meson: rename targetos to host_os	2 years ago
plugins	contrib/plugins: add Instructions Per Second (IPS) example for cost modeling	2 years ago
systemd	contrib: add systemd unit files	8 years ago
vhost-user-blk	configure, meson: rename targetos to host_os	2 years ago
vhost-user-gpu	virtio-gpu: Correct virgl_renderer_resource_get_info() error check	2 years ago
vhost-user-input	configure, meson: rename targetos to host_os	2 years ago
vhost-user-scsi	configure, meson: rename targetos to host_os	2 years ago