7d18a10c31
The hist trigger action code currently implements two essentially hard-coded pairs of 'actions' - onmax(), which tracks a variable and saves some event fields when a max is hit, and onmatch(), which is hard-coded to generate a synthetic event. These hardcoded pairs (track max/save fields and detect match/generate synthetic event) should really be decoupled into separate components that can then be arbitrarily combined. The first component of each pair (track max/detect match) is called a 'handler' in the new code, while the second component (save fields/generate synthetic event) is called an 'action' in this scheme. This change refactors the action code to reflect this split by adding two handlers, HANDLER_ONMATCH and HANDLER_ONMAX, along with two actions, ACTION_SAVE and ACTION_TRACE. The new code combines them to produce the existing ONMATCH/TRACE and ONMAX/SAVE functionality, but doesn't implement the other combinations now possible. Future patches will expand these to further useful cases, such as ONMAX/TRACE, as well as add additional handlers and actions such as ONCHANGE and SNAPSHOT. Also, add abbreviated documentation for handlers and actions to README. Link: http://lkml.kernel.org/r/98bfdd48c1b4ff29fc5766442f99f5bc3c34b76b.1550100284.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
||
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.
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.