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mm/damon: add default allow/reject behavior fields to struct damos

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Current default allow/reject behavior of filters handling stage has made
before introduction of the allow behavior.  For allow-filters usage, it is
confusing and inefficient.

It is more intuitive to decide the default filtering stage allow/reject
behavior as opposite to the last filter's behavior.  The decision should
be made separately for core and operations layers' filtering stages, since
last core layer-handled filter is not really a last filter if there are
operations layer handling filters.

Keeping separate decisions for the two categories can make the logic
simpler.  Add fields for storing the two decisions.

Link: https://lkml.kernel.org/r/20250304211913.53574-7-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>
This commit is contained in:
SeongJae Park 2025-03-04 13:19:10 -08:00 committed by Andrew Morton
parent 627983a552
commit dd038b728c
1 changed files with 3 additions and 0 deletions
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3
include/linux/damon.h
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@ -502,6 +502,9 @@ struct damos {
* layer-handled filters. If true, operations layer allows it, too.
*/
bool core_filters_allowed;
/* whether to reject core/ops filters umatched regions */
bool core_filters_default_reject;
bool ops_filters_default_reject;
/* public: */
struct damos_quota quota;
struct damos_watermarks wmarks;