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A virtual CPU that has received a warning-track interrupt may fail to acknowledge the interrupt within the warning-track grace period. While this is usually not a problem, it will become necessary to investigate if there is a large number of such missed warning-track interrupts. Therefore, it is necessary to track these events. The information is tracked through the s390 debug facility and can be found under /sys/kernel/debug/s390dbf/wti/. The hex_ascii output is formatted as: <pid> <symbol> The values pid and current psw are collected when a warning track interrupt is received. Symbol is either the kernel symbol matching the collected psw or redacted to <user> when running in user space. Each line represents the currently executing process when a warning track interrupt was received which was then not acknowledged within its grace period. Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Mete Durlu <meted@linux.ibm.com> Signed-off-by: Tobias Huschle <huschle@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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 reStructuredText 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.