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A running task might be within an RCU Tasks Trace read-side critical section for any length of time, but will not be placed on any of the per-CPU rcu_tasks_percpu structure's ->rtp_blkd_tasks lists. Therefore any RCU Tasks Trace grace-period processing that does not scan the full task list must interact with the running tasks. This commit therefore causes the rcu_tasks_trace_pregp_step() function to IPI each CPU in order to place the corresponding task on the holdouts list and to record whether or not it was in an RCU Tasks Trace read-side critical section. Yes, it is possible to avoid adding it to that list if it is not a reader, but that would prevent the system from remembering that this task was in a quiescent state. Which is why the running tasks are unconditionally added to the holdout list. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Martin KaFai Lau <kafai@fb.com> Cc: KP Singh <kpsingh@kernel.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.