Commit 6a18bbe4 authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

mm/damon: add DAMOS quota goal type for per-memcg per-node memory usage 

Define a new DAMOS quota auto-tuning target metric for per-cgroup per-node
memory usage.  For specifying the cgroup of the interest, add a field,
namely memcg_id, to damos_quota_goal struct.

Note that this commit is only implementing the interface.  The handling of
the interface (the metric value calculation) will be implemented in the
following commit.

Link: https://lkml.kernel.org/r/20251017212706.183502-3-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent d3946c5f

include/linux/damon.h

+10 −1
Original line number Diff line number Diff line
@@ -147,6 +147,7 @@ enum damos_action { 
 * @DAMOS_QUOTA_SOME_MEM_PSI_US:	System level some memory PSI in us.

 * @DAMOS_QUOTA_NODE_MEM_USED_BP:	MemUsed ratio of a node.

 * @DAMOS_QUOTA_NODE_MEM_FREE_BP:	MemFree ratio of a node.

 * @DAMOS_QUOTA_NODE_MEMCG_USED_BP:	MemUsed ratio of a node for a cgroup.

 * @NR_DAMOS_QUOTA_GOAL_METRICS:	Number of DAMOS quota goal metrics.

 *

 * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported.
@@ -156,6 +157,7 @@ enum damos_quota_goal_metric { 
	DAMOS_QUOTA_SOME_MEM_PSI_US,

	DAMOS_QUOTA_NODE_MEM_USED_BP,

	DAMOS_QUOTA_NODE_MEM_FREE_BP,

	DAMOS_QUOTA_NODE_MEMCG_USED_BP,

	NR_DAMOS_QUOTA_GOAL_METRICS,

};
@@ -166,6 +168,7 @@ enum damos_quota_goal_metric { 
 * @current_value:	Current value of @metric.

 * @last_psi_total:	Last measured total PSI

 * @nid:		Node id.

 * @memcg_id:		Memcg id.

 * @list:		List head for siblings.

 *

 * Data structure for getting the current score of the quota tuning goal.  The
@@ -179,6 +182,9 @@ enum damos_quota_goal_metric { 
 *

 * If @metric is DAMOS_QUOTA_NODE_MEM_{USED,FREE}_BP, @nid represents the node

 * id of the target node to account the used/free memory.

 *

 * If @metric is DAMOS_QUOTA_NODE_MEMCG_USED_BP, @nid and @memcg_id represents

 * the node id and the cgroup to account the used memory for.

 */

struct damos_quota_goal {

	enum damos_quota_goal_metric metric;
@@ -187,7 +193,10 @@ struct damos_quota_goal { 
	/* metric-dependent fields */

	union {

		u64 last_psi_total;

		struct {

			int nid;

			unsigned short memcg_id;

		};

	};

	struct list_head list;

};