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cpu-throttle: new module, extracted from cpus.c

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move the vcpu throttling functionality into its own module.

This functionality is not specific to any accelerator,
and it is used currently by migration to slow down guests to try to
have migrations converge, and by the cocoa MacOS UI to throttle speed.

cpu-throttle contains the controls to adjust and inspect throttle
settings, start (set) and stop vcpu throttling, and the throttling
function itself that is run periodically on vcpus to make them take a nap.

Execution of the throttling function on all vcpus is triggered by a timer,
registered at module initialization.

No functionality change.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20200629093504.3228-3-cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Fontana 2020-06-29 11:35:03 +02:00 • committed by Paolo Bonzini
parent c7f419f584
commit b0c3cf9407
10 changed files with 208 additions and 124 deletions
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5
include/qemu/main-loop.h
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@ -303,6 +303,11 @@ void qemu_mutex_unlock_iothread(void);
*/
void qemu_cond_wait_iothread(QemuCond *cond);
/*
* qemu_cond_timedwait_iothread: like the previous, but with timeout
*/
void qemu_cond_timedwait_iothread(QemuCond *cond, int ms);
/* internal interfaces */
void qemu_fd_register(int fd);