iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Docs/admin-guide/mm/damon/usage: explain the format of damon_aggregate tracepoint

Browse Source 
The example of the section for damon_aggregated tracepoint is not
explaining how the output looks like, and how it can be interpreted.
Add it.

Link: https://lkml.kernel.org/r/20230907022929.91361-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2023-09-07 02:29:23 +00:00 committed by Andrew Morton
parent 24df886f9f
commit 4f554ca15a
2 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/admin-guide/mm/damon/usage.rst
View File

@ -513,6 +513,20 @@ results using tracepoint supporting tools like ``perf``. For example::
# kill 9 $(pidof perf)
# echo off > monitor_on
# perf script
kdamond.0 46568 [027] 79357.842179: damon:damon_aggregated: target_id=0 nr_regions=11 122509119488-135708762112: 0 864
[...]
Each line of the perf script output represents each monitoring region. The
first five fields are as usual other tracepoint outputs. The sixth field
(``target_id=X``) shows the ide of the monitoring target of the region. The
seventh field (``nr_regions=X``) shows the total number of monitoring regions
for the target. The eighth field (``X-Y:``) shows the start (``X``) and end
(``Y``) addresses of the region in bytes. The ninth field (``X``) shows the
``nr_accesses`` of the region (refer to
:ref:`design <damon_design_region_based_sampling>` for more details of the
counter). Finally the tenth field (``X``) shows the ``age`` of the region
(refer to :ref:`design <damon_design_age_tracking>` for more details of the
counter).
.. _debugfs_interface:

4
Documentation/mm/damon/design.rst
View File

@ -154,6 +154,8 @@ The monitoring overhead of this mechanism will arbitrarily increase as the
size of the target workload grows.
.. _damon_design_region_based_sampling:
Region Based Sampling
~~~~~~~~~~~~~~~~~~~~~
@ -191,6 +193,8 @@ In this way, DAMON provides its best-effort quality and minimal overhead while
keeping the bounds users set for their trade-off.
.. _damon_design_age_tracking:
Age Tracking
~~~~~~~~~~~~