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 1602B310652; Sun, 26 Apr 2026 20:52:39 +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=1777236760; cv=none; b=pmQQq/6FPy9i0G6WRI0RTroP9XjhoE/AyGt6lW+mQPqFxkYk6fiY+0JMy8A4VpdkCG3j83lnBOu0yaJNa1v7DGvquu+ssOsIvEy/+9J9oK+5AfuXcJZlvDv36KueOQGsBUGPrdpodVW8iel8prwP57X19rzvwesq3lCTFoUS8bU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777236760; c=relaxed/simple; bh=n8NHvN0HAPPSe4MQZU6Swveu54v2WkmDhfNoQjsKaCo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r0OaIN/idcWWipoFCVERv7AgCEF4Oloh1N7/Zpizje4Gp/oteGwwWHGcPWaPF7MlK0pW4zkqdUfSfSz2NpQXMYP5+wnj8U2oVZUz4MLYvRerRfLMoV6gUdlXjWC7uThtHA329QaXMSxDUDUQsvB/IrBrqN717Tscs3FiE5ehb8k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NH9APUYW; 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="NH9APUYW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 970B4C2BCF4; Sun, 26 Apr 2026 20:52:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777236759; bh=n8NHvN0HAPPSe4MQZU6Swveu54v2WkmDhfNoQjsKaCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NH9APUYWZFrbBawnXc54h5wO3jk22Ljsb8FDaKjTPE4XtsmgvJsPZWYjK7R+cE1oC 9E4cSDT7r3TU0S8msSsBt0coiwCm78j4lonit803zJjWXwVgLf45ncS0frVteVeilU 3WllJgUzE9vksddpywRtfMEM77ScUhUc47u7VmPm3zEfNx2QbIEUqb3Q9CPvxuVwzX H1hGcCSB63BG32JEsucHLoiInOAUEn25GLjBFF8Tz7a+67ib7WNeuxBTIEnmPiyjZn 16wEiGIygzm+g9iwxzJ5M89VcwKnk0j0qEGYqAKxQt/MYgMYJVMKqB1tFNg+Ievn5A bFup5naqx51XQ== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 15/19] mm/damon/sysfs-schemes: implement tried_region/probe_hits file Date: Sun, 26 Apr 2026 13:52:16 -0700 Message-ID: <20260426205222.93895-16-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260426205222.93895-1-sj@kernel.org> References: <20260426205222.93895-1-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 Implement a file for letting users read the per-region per-probe positive samples count. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index c3c1ff6108863..48a949484a052 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -20,6 +20,7 @@ struct damon_sysfs_scheme_region { unsigned int nr_accesses; unsigned int age; unsigned long sz_filter_passed; + unsigned char probe_hits[DAMON_MAX_PROBES]; struct list_head list; }; @@ -34,6 +35,9 @@ static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc( sysfs_region->ar = region->ar; sysfs_region->nr_accesses = region->nr_accesses_bp / 10000; sysfs_region->age = region->age; + memcpy(sysfs_region->probe_hits, region->probe_hits, + sizeof(*sysfs_region->probe_hits) * + ARRAY_SIZE(sysfs_region->probe_hits)); INIT_LIST_HEAD(&sysfs_region->list); return sysfs_region; } @@ -83,6 +87,28 @@ static ssize_t sz_filter_passed_show(struct kobject *kobj, return sysfs_emit(buf, "%lu\n", region->sz_filter_passed); } +static ssize_t probe_hits_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_region *region = container_of(kobj, + struct damon_sysfs_scheme_region, kobj); + char *str; + int ret, i; + + str = kcalloc(2048, sizeof(*str), GFP_KERNEL); + if (!str) + return -ENOMEM; + for (i = 0; i < DAMON_MAX_PROBES; i++) { + snprintf(&str[strlen(str)], 2048 - strlen(str), "%hhu", + region->probe_hits[i]); + if (i < DAMON_MAX_PROBES - 1) + snprintf(&str[strlen(str)], 2048 - strlen(str), ","); + } + ret = sysfs_emit(buf, "%s\n", str); + kfree(str); + return ret; +} + static void damon_sysfs_scheme_region_release(struct kobject *kobj) { struct damon_sysfs_scheme_region *region = container_of(kobj, @@ -107,12 +133,16 @@ static struct kobj_attribute damon_sysfs_scheme_region_age_attr = static struct kobj_attribute damon_sysfs_scheme_region_sz_filter_passed_attr = __ATTR_RO_MODE(sz_filter_passed, 0400); +static struct kobj_attribute damon_sysfs_scheme_region_probe_hits_attr = + __ATTR_RO_MODE(probe_hits, 0400); + static struct attribute *damon_sysfs_scheme_region_attrs[] = { &damon_sysfs_scheme_region_start_attr.attr, &damon_sysfs_scheme_region_end_attr.attr, &damon_sysfs_scheme_region_nr_accesses_attr.attr, &damon_sysfs_scheme_region_age_attr.attr, &damon_sysfs_scheme_region_sz_filter_passed_attr.attr, + &damon_sysfs_scheme_region_probe_hits_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme_region); -- 2.47.3