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Byungchul Park efcd2d5436 rcu: Call wake_nocb_leader_defer() with 'FORCE' when nocb_q_count is high 
If an excessive number of callbacks have been queued, but the NOCB
leader kthread's wakeup must be deferred, then we should wake up the
leader unconditionally once it is safe to do so.

This was handled correctly in commit fbce7497ee ("rcu: Parallelize and
economize NOCB kthread wakeups"), but then commit 8be6e1b15c ("rcu:
Use timer as backstop for NOCB deferred wakeups") passed RCU_NOCB_WAKE
instead of the correct RCU_NOCB_WAKE_FORCE to wake_nocb_leader_defer().
As an interesting aside, RCU_NOCB_WAKE_FORCE is never passed to anything,
which should have been taken as a hint.  ;-)

This commit therefore passes RCU_NOCB_WAKE_FORCE instead of RCU_NOCB_WAKE
to wake_nocb_leader_defer() when a callback is queued onto a NOCB CPU
that already has an excessive number of callbacks pending.

Signed-off-by: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>
2018-05-15 10:27:18 -07:00
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Makefile Linux 4.17-rc1 2018-04-15 18:24:20 -07:00
README

README 

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.