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On systems with hundreds of CPUs, if most of the CPUs detect a CSD hang, then all of these waiting CPUs send an NMI to the destination CPU in order to dump its backtrace. Given enough NMIs, the destination CPU will spent much of its time producing backtraces, thus further delaying that CPU's response to the original CSD IPI. In the worst case, by the time destination CPU is done producing all of these backtrace NMIs, the CSD wait timeout will have elapsed so that the waiters resend their backtrace NMIs again, further delaying forward progress. Therefore, to avoid these delays, issue the backtrace NMI only from the first waiter. The destination CPU's other waiters can make use of backtrace obtained from the first waiter's NMI. Signed-off-by: Imran Khan <imran.f.khan@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Juergen Gross <jgross@suse.com> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Yury Norov <yury.norov@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@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.