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In the progress of vCPUs creation, it queues a kvmclock sync worker to the global workqueue before each vCPU creation completes. The workqueue subsystem guarantees not to queue the already queued work; however, we can make the logic more clear by making just one leader to trigger this kvmclock sync request, and also save on cacheline bouncing caused by test_and_set_bit. Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.