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The following trace event keys are mapped to:
(1) load : se->avg.load_avg
(2) rbl_load : se->avg.runnable_load_avg
(3) util : se->avg.util_avg
To let this trace event work for configurations w/ and w/o group
scheduling support for cfs (CONFIG_FAIR_GROUP_SCHED) the following
special handling is necessary for non-existent key=value pairs:
path = "(null)" : In case of !CONFIG_FAIR_GROUP_SCHED or the
sched_entity represents a task.
comm = "(null)" : In case sched_entity represents a task_group.
pid = -1 : In case sched_entity represents a task_group.
The following list shows examples of the key=value pairs in different
configurations for:
(1) a task:
cpu=0 path=(null) comm=sshd pid=2206 load=102 rbl_load=102 util=102
(2) a taskgroup:
cpu=1 path=/tg1/tg11/tg111 comm=(null) pid=-1 load=882 rbl_load=882 util=510
(3) an autogroup:
cpu=0 path=/autogroup-13 comm=(null) pid=-1 load=49 rbl_load=49 util=48
(4) w/o CONFIG_FAIR_GROUP_SCHED:
cpu=0 path=(null) comm=sshd pid=2211 load=301 rbl_load=301 util=265
The trace event is only defined for CONFIG_SMP.
The helper functions __trace_sched_cpu(), __trace_sched_path() and
__trace_sched_id() are extended to deal with sched_entities as well.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
[ Fixed issues related to the new pelt.c file ]
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Change-Id: Id2e4d1ddb79c13412c80e4fa4147b9df3b1e212a
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.