| From: SeongJae Park <sj@kernel.org> |
| Subject: 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> |
| --- |
| |
| Documentation/vm/damon/design.rst | 7 ++++--- |
| 1 file changed, 4 insertions(+), 3 deletions(-) |
| |
| --- a/Documentation/vm/damon/design.rst~docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling |
| +++ a/Documentation/vm/damon/design.rst |
| @@ -84,9 +84,10 @@ table having a mapping to the address. |
| 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 |
| _ |
