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Paul E. McKenney
8f870e6eb8
Commit282d8998e9("srcu: Prevent expedited GPs and blocking readers from consuming CPU") fixed a problem where a long-running expedited SRCU grace period could block kernel live patching. It did so by giving up on expediting once a given SRCU expedited grace period grew too old. Unfortunately, this added excessive delays to boots of virtual embedded systems specifying "-bios QEMU_EFI.fd" to qemu. This commit therefore makes the transition away from expediting less aggressive, increasing the per-grace-period phase number of non-sleeping polls of readers from one to three and increasing the required grace-period age from one jiffy (actually from zero to one jiffies) to two jiffies (actually from one to two jiffies). Fixes:282d8998e9("srcu: Prevent expedited GPs and blocking readers from consuming CPU") Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reported-by: Zhangfei Gao <zhangfei.gao@linaro.org> Reported-by: chenxiang (M)" <chenxiang66@hisilicon.com> Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Neeraj Upadhyay <quic_neeraju@quicinc.com> Link: https://lore.kernel.org/all/20615615-0013-5adc-584f-2b1d5c03ebfc@linaro.org/
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.