b629f3e9d0
The cgroup sort key is to show cgroup membership of each task.
Currently it shows full path in the cgroupfs (not relative to the root
of cgroup namespace) since it'd be more intuitive IMHO. Otherwise root
cgroup in different namespaces will all show same name - "/".
The cgroup sort key should come before cgroup_id otherwise
sort_dimension__add() will match it to cgroup_id as it only matches with
the given substring.
For example it will look like following. Note that record patch adding
--all-cgroups patch will come later.
$ perf record -a --namespace --all-cgroups cgtest
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.208 MB perf.data (4090 samples) ]
$ perf report -s cgroup_id,cgroup,pid
...
# Overhead cgroup id (dev/inode) Cgroup Pid:Command
# ........ ..................... .......... ...............
#
93.96% 0/0x0 / 0:swapper
1.25% 3/0xeffffffb / 278:looper0
0.86% 3/0xf000015f /sub/cgrp1 280:cgtest
0.37% 3/0xf0000160 /sub/cgrp2 281:cgtest
0.34% 3/0xf0000163 /sub/cgrp3 282:cgtest
0.22% 3/0xeffffffb /sub 278:looper0
0.20% 3/0xeffffffb / 280:cgtest
0.15% 3/0xf0000163 /sub/cgrp3 285:looper3
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200325124536.2800725-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 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.