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Add support for a timestamp event field. This is actually a 'pseudo-' event field in that it behaves like it's part of the event record, but is really part of the corresponding ring buffer event. To make use of the timestamp field, users can specify "common_timestamp" as a field name for any histogram. Note that this doesn't make much sense on its own either as either a key or value, but needs to be supported even so, since follow-on patches will add support for making use of this field in time deltas. The common_timestamp 'field' is not a bona fide event field - so you won't find it in the event description - but rather it's a synthetic field that can be used like a real field. Note that the use of this field requires the ring buffer be put into 'absolute timestamp' mode, which saves the complete timestamp for each event rather than an offset. This mode will be enabled if and only if a histogram makes use of the "common_timestamp" field. Link: http://lkml.kernel.org/r/97afbd646ed146e26271f3458b4b33e16d7817c2.1516069914.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Baohong Liu <baohong.liu@intel.com> [kasan use-after-free fix] Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.