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Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling 

In DAMON's early development stage before it be merged in the mainline, it
was first designed to work exclusively with Idle page tracking to avoid
any interference between each other.  Later, but still before be merged in
the mainline, because Idle page tracking is fully under the control of
sysadmins, we made the resolving of conflict as the responsibility of
sysadmins.  The document is not updated for the change, though.  This
commit updates the document for that.

Link: https://lkml.kernel.org/r/20220222170100.17068-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
SeongJae Park 2022-03-22 14:49:15 -07:00 committed by Linus Torvalds
parent 561f4fc497
commit 742cc2bfce
1 changed files with 4 additions and 3 deletions
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7
Documentation/vm/damon/design.rst
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@ -84,9 +84,10 @@ table having a mapping to the address. In this way, the implementations find
and clear the bit(s) for next sampling target address and checks whether the
bit(s) set again after one sampling period. This could disturb other kernel
subsystems using the Accessed bits, namely Idle page tracking and the reclaim
logic. To avoid such disturbances, DAMON makes it mutually exclusive with Idle
page tracking and uses ``PG_idle`` and ``PG_young`` page flags to solve the
conflict with the reclaim logic, as Idle page tracking does.
logic. DAMON does nothing to avoid disturbing Idle page tracking, so handling
the interference is the responsibility of sysadmins. However, it solves the
conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags,
as Idle page tracking does.
Address Space Independent Core Mechanisms