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Sat, 03 Oct 2026 13:27:31 -0700 (PDT) Received: from localhost.localdomain ([2600:1700:4577:1050:550f:9551:5468:60f1]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8ae33fe81fdsm23389887b3.47.2026.10.03.13.27.28 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 03 Oct 2026 13:27:30 -0700 (PDT) From: Ravi Jonnalagadda To: Andrew Morton , SJ Park Cc: Ravi Jonnalagadda , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Bijan Tabatabai , Ajay Joshi , Honggyu Kim , Yunjeong Mun , Akinobu Mita , Lian Wang , Kunwu Chan Subject: [PATCH] mm/damon: add damos_node_eligible_mem_bp tracepoint Date: Sat, 3 Oct 2026 13:27:27 -0700 Message-ID: <20261003202727.3673-1-ravis.opensrc@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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/ Signed-off-by: Ravi Jonnalagadda --- include/trace/events/damon.h | 31 +++++++++++++++++++++++++++++++ mm/damon/core.c | 16 ++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h index 8851727ae162..2c7249cc7c88 100644 --- a/include/trace/events/damon.h +++ b/include/trace/events/damon.h @@ -74,6 +74,37 @@ TRACE_EVENT(damos_esz, __entry->esz) ); +/* Per-tick DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP goal evaluation. */ +TRACE_EVENT(damos_node_eligible_mem_bp, + + TP_PROTO(unsigned int context_idx, unsigned int scheme_idx, + int nid, + unsigned long target_value, unsigned long current_value), + + TP_ARGS(context_idx, scheme_idx, nid, target_value, current_value), + + TP_STRUCT__entry( + __field(unsigned int, context_idx) + __field(unsigned int, scheme_idx) + __field(int, nid) + __field(unsigned long, target_value) + __field(unsigned long, current_value) + ), + + TP_fast_assign( + __entry->context_idx = context_idx; + __entry->scheme_idx = scheme_idx; + __entry->nid = nid; + __entry->target_value = target_value; + __entry->current_value = current_value; + ), + + TP_printk("ctx_idx=%u scheme_idx=%u nid=%d target_value=%lu current_value=%lu", + __entry->context_idx, __entry->scheme_idx, + __entry->nid, + __entry->target_value, __entry->current_value) +); + TRACE_EVENT_CONDITION(damos_before_apply, TP_PROTO(unsigned int context_idx, unsigned int scheme_idx, diff --git a/mm/damon/core.c b/mm/damon/core.c index b63e60ef8990..6ddd15dc4f55 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3294,6 +3294,22 @@ static unsigned long damos_quota_score(struct damon_ctx *c, struct damos *s) highest_score = max(highest_score, mult_frac(goal->current_value, 10000, goal->target_value)); + + if (goal->metric == DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP && + trace_damos_node_eligible_mem_bp_enabled()) { + unsigned int cidx = 0, sidx = 0; + struct damos *siter; + + damon_for_each_scheme(siter, c) { + if (siter == s) + break; + sidx++; + } + trace_damos_node_eligible_mem_bp(cidx, sidx, + goal->nid, + goal->target_value, + goal->current_value); + } } return highest_score; base-commit: 763ad0211c7b587344f03bc4d1299810aeb736f4 -- 2.54.0 (Apple Git-157)