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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 44F8CA0008 X-Rspamd-Server: rspam04 X-Stat-Signature: a7i6p184ytq7w7roqxht8ib85fmzrce8 X-HE-Tag: 1777236760-849161 X-HE-Meta: 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 TBJNDC21 Dxsqz7/uMnXwrZsWys1xtcj1+fZY9zfy6NaXbqKDdtNo2VoUuUYevFwj+Rx7VkfH+QutaSLO2HqLCgXg9SaZGcUvPElM1Lw1iV8QgmXoKGhdl8KOzSx07E7H74fmWUbPbbq+CRu7ZmMZX09D2b4LRAjOuQXfwSUa/M2N6ykNQBhn5mBqTw98K/BePpXNClFvsPdwQ3u1d4LWLlzuvHub3GeVAGNrAmLelcGXtQQ/NKBp2Crxjqg3RJGfvOgzFlxpICIaWDt26GqQevkV7G8sG/2aEFA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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