Re: [PATCH] mm/damon: add damos_node_eligible_mem_bp tracepoint

Add a tracepoint for DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP quota goal
evaluation.  The tracepoint fires once per quota-score computation when
the goal metric is DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP, exposing
context_idx, scheme_idx, nid, target_value, and current_value.
current_value is reported as the quota tuning sees it, after the goal's
complement setting is applied.

The DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP metric expresses node memory
occupancy as basis points of eligible bytes.  This information is not
exposed through any existing external interface (perf stat, /proc, or
sysfs), so the tracepoint is the only way for userspace to observe the
target and current eligible-memory basis point values at quota-scoring
time.

Link: https://lore.kernel.org/linux-mm/20260428030520.701-1-ravis.opensrc@gmail.com/ (local)
Signed-off-by: Ravi Jonnalagadda <redacted>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261003202727.3673-1-ravis.opensrc@gmail.com?part=1