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Docs/mm/damon/design: explicitly introduce ``nr_accesses`` 

The design document is explaining about the access tracking mechanism
and the access rate counter (nr_accesses), but not directly mentions the
name.  Add a sentence for making it clear.

Link: https://lkml.kernel.org/r/20230907022929.91361-5-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 02:29:22 +00:00 committed by Andrew Morton
parent 4f7112786e
commit 24df886f9f
1 changed files with 4 additions and 3 deletions
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7
Documentation/mm/damon/design.rst
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@ -163,9 +163,10 @@ assumption (pages in a region have the same access frequencies) is kept, only
one page in the region is required to be checked. Thus, for each ``sampling
interval``, DAMON randomly picks one page in each region, waits for one
``sampling interval``, checks whether the page is accessed meanwhile, and
increases the access frequency of the region if so. Therefore, the monitoring
overhead is controllable by setting the number of regions. DAMON allows users
to set the minimum and the maximum number of regions for the trade-off.
increases the access frequency counter of the region if so. The counter is
called ``nr_regions`` of the region. Therefore, the monitoring overhead is
controllable by setting the number of regions. DAMON allows users to set the
minimum and the maximum number of regions for the trade-off.
This scheme, however, cannot preserve the quality of the output if the
assumption is not guaranteed.