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 82024282F1F; Thu, 14 May 2026 14:09:24 +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=1778767764; cv=none; b=Lx1by/BX3+qx9IPL2xAWNINhujiR2v/mPmY+JdOq43x/nbP4y5fIfZrl2FCz3dtTNyvpp2ugCyNNqvIG06f4teHAfuEDMHFwxeb8466AZn8nDC23kiiB2/mK1KOWxJvQeDSbUV28F+BHRXVVXY5IyNBKME2rrNaW+dmLqTMoVLs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778767764; c=relaxed/simple; bh=98x5lFOR2XwPdx9xbb2XrTj95QF7fTzrnwdxu0XvwKU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PPwAbRWTy7LlFnmYNn9IycuhaII6kbUlMyyajds8j4TIpI35lBd1RAdW1g5OVuYh4IN9IEhHwy9HB0f5vK1ijVQNZu5hS9QkdcCroh0wWNJSGshzyXRqDTSyLhpAGisPQ2/5hQ92XYaO/vgaKMQeJnpQLr82toukisYqe7TcH58= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=u3J+Hs+b; 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="u3J+Hs+b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DCE3C2BCF6; Thu, 14 May 2026 14:09:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778767764; bh=98x5lFOR2XwPdx9xbb2XrTj95QF7fTzrnwdxu0XvwKU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u3J+Hs+bJYJBU0vB5bjHF5kTSDn6wUE/wGRUGO4rlA1fMJnyVu3yoIeJqutZBg/L2 uoRGA++fdIkiAYeGWLvfm1UDC49pJjegfkNpZsziypyKWN22sOEj0oet7h26/EDA/C v9covqeZp5MHiSJNxkQ48nFxv48Jv1gZUOcWPytCvBxzSSazkTMFJLYC0N1PrUbhpz TiIaYOPwfHZPsLJs2A/qqpqYm90DZYavaguOVQI1jXt3FLO2r3H6pAnnQYev0AwjHo ZW9OBJMAQUkgPN7vFjmkCr8SHDvRgk+Tqof263gHDPdkXIIIeK05U09CETSZNSWdK4 7UwVwvH7rAWhw== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , 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: [RFC PATCH v2.1 18/28] mm/damon: trace probe_hits Date: Thu, 14 May 2026 07:08:51 -0700 Message-ID: <20260514140904.119781-19-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260514140904.119781-1-sj@kernel.org> References: <20260514140904.119781-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-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..2b96a03876034 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_aggregated_v2, + + 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 fe6c789f2cecb..0ad1a0af06893 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1905,6 +1905,13 @@ 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_aggregated_v2_enabled()) { + damon_for_each_probe(probe, c) + nr_probes++; + } damon_for_each_target(t, c) { struct damon_region *r; @@ -1913,6 +1920,8 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) int i; trace_damon_aggregated(ti, r, damon_nr_regions(t)); + trace_damon_aggregated_v2(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