From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29A13351C0C; Mon, 18 May 2026 23:41:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779147690; cv=none; b=nQOgqN0IpfxO4Lb8xdMVzWfDNGqTNw6jl/ypK72E1Cc8hvzsqfpOgzRH0kHwUCZaKicKImh0KO0cPoMdCdL/GBkEmT0r4IEB1cs+g0V9Zo6OD2JmO3p0ntS3vFl7qWhP5GtLEczTyRVtnZjdjhRa0MINqAtZlTZle561qQWUSbs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779147690; c=relaxed/simple; bh=oi/JcE35e0BkzNgUR9uyr6y/BZqSFxdfd3cKlzhvFvg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SbSCrInWZ/QpCeZTBv0IjOHhDy+E4hKpQnXt9v2vHVljgz3VAKFV563FCZ/tIVjq/X4Tud3zYWE2bI8z9lfmRctR1NdpF/O83ivyanE3JyjkOihA6n9VL+9vhEnB50ba9IQW4yDmzs/f8HD/QXSOE2PQ36hrUGDwc65x2EMthUU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vPuKh+sf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vPuKh+sf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7D0EC2BCF6; Mon, 18 May 2026 23:41:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1779147690; bh=oi/JcE35e0BkzNgUR9uyr6y/BZqSFxdfd3cKlzhvFvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vPuKh+sfRjGLW/nvTDitPAIw3lLZyXsSmvIzv4jkG6j5f2mhGzq50UVbZ8zELzgsI ydxwT4tUwTYrmkVtqAKm9VhqZxZjEq1fYn/pZi0UxjeY2y6XzT6BTft0sLxvHxhFZy Jk+qq8C9LAJ06MZ+WehePbeI/4xcRDffel7hdE4ZgLHi/e60FRqpQkvaKPZI0jSfPE eSpWwEHe0VWNjpJFkXUvgQddPfIBbVSML/9IiCgsRW3AVqSjFi0lvCDGnA5A9X//PP 8hewp/LLn1WxCQ4/2yBzmhr+Cj9U2yq1Pxyel1/Vq3MVqB4A+4b6YS5DG3Y6UKrsOt 6sn7E7PZgRiPQ== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Masami Hiramatsu , Mathieu Desnoyers , Steven Rostedt , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH 18/28] mm/damon: trace probe_hits Date: Mon, 18 May 2026 16:41:06 -0700 Message-ID: <20260518234119.97569-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260518234119.97569-1-sj@kernel.org> References: <20260518234119.97569-1-sj@kernel.org> 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 Introduce a new tracepoint for exposing the per-region per-probe positive sample count via tracefs. Signed-off-by: SeongJae Park --- include/trace/events/damon.h | 38 ++++++++++++++++++++++++++++++++++++ mm/damon/core.c | 9 +++++++++ 2 files changed, 47 insertions(+) diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h index 7e25f4469b81b..78388538acf44 100644 --- a/include/trace/events/damon.h +++ b/include/trace/events/damon.h @@ -130,6 +130,44 @@ TRACE_EVENT(damon_monitor_intervals_tune, TP_printk("sample_us=%lu", __entry->sample_us) ); +TRACE_EVENT_CONDITION(damon_region_aggregated, + + TP_PROTO(unsigned int target_id, struct damon_region *r, + unsigned int nr_regions, unsigned int nr_probes), + + TP_ARGS(target_id, r, nr_regions, nr_probes), + + TP_CONDITION(nr_probes > 0), + + TP_STRUCT__entry( + __field(unsigned long, target_id) + __field(unsigned long, start) + __field(unsigned long, end) + __field(unsigned int, nr_regions) + __field(unsigned int, nr_accesses) + __field(unsigned int, age) + __dynamic_array(unsigned char, probe_hits, nr_probes) + ), + + TP_fast_assign( + __entry->target_id = target_id; + __entry->start = r->ar.start; + __entry->end = r->ar.end; + __entry->nr_regions = nr_regions; + __entry->nr_accesses = r->nr_accesses; + __entry->age = r->age; + memcpy(__get_dynamic_array(probe_hits), r->probe_hits, + sizeof(*r->probe_hits) * nr_probes); + ), + + TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u probe_hits=%s", + __entry->target_id, __entry->nr_regions, + __entry->start, __entry->end, + __entry->nr_accesses, __entry->age, + __print_hex(__get_dynamic_array(probe_hits), + __get_dynamic_array_len(probe_hits))) +); + TRACE_EVENT(damon_aggregated, TP_PROTO(unsigned int target_id, struct damon_region *r, diff --git a/mm/damon/core.c b/mm/damon/core.c index 433da8781e255..5ba7ad4df4351 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1908,6 +1908,13 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) { struct damon_target *t; unsigned int ti = 0; /* target's index */ + unsigned int nr_probes = 0; + struct damon_probe *probe; + + if (trace_damon_region_aggregated_enabled()) { + damon_for_each_probe(probe, c) + nr_probes++; + } damon_for_each_target(t, c) { struct damon_region *r; @@ -1916,6 +1923,8 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) int i; trace_damon_aggregated(ti, r, damon_nr_regions(t)); + trace_damon_region_aggregated(ti, r, + damon_nr_regions(t), nr_probes); damon_warn_fix_nr_accesses_corruption(r); r->last_nr_accesses = r->nr_accesses; r->nr_accesses = 0; -- 2.47.3