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The rcu_torture_fwd_prog_nr() tests the ability of RCU to tolerate in-kernel busy loops. It invokes rcu_torture_fwd_prog_cond_resched() within its delay loop, which, in PREEMPT && NO_HZ_FULL kernels results in the occasional direct call to schedule(). Now, this direct call to schedule() is appropriate for call_rcu() flood testing, in which either the kernel should restrain itself or userspace transitions will supply the needed restraint. But in pure in-kernel loops, the occasional cond_resched() should do the job. This commit therefore makes rcu_torture_fwd_prog_nr() use cond_resched() instead of rcu_torture_fwd_prog_cond_resched() in order to increase the brutality of this aspect of rcutorture testing. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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.