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b=mRkUz/Iu/Pl0hqM6pdMSVBXMftjfKuqsByDORaWV2AND1xZ6h/4+982YgmU6QcQuH g8jWIwjrT5Qkj4wjpk2dbujwRmExzpzk8QN8m4za8sWTXuPO2LawEe+71nJN9ihOAT g8jWDOsAPshhen7ToCNMs7VnJ2HR+ZQ4GPiuYnuYYwnF8P2NCaKDQ7pg+LYmVmFWsc Ch0p24kb89fzx8wpSlmPSt2NJ5wmQv/FUWpi4l2wlIVhS3w4rspfTcN8eLD5l9EQpR Q8m79U5A3IM2M4ghD6qg7pg1Zf7Lv+KPTKrahpM2Oa9hvmacmPTWHslwU0QCSzD0H7 IkRNx9I1T0sag== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 08/12] mm/damon/sysfs-schemes: implement max_nr_snapshots file Date: Tue, 16 Dec 2025 00:01:21 -0800 Message-ID: <20251216080128.42991-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251216080128.42991-1-sj@kernel.org> References: <20251216080128.42991-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 14C27A000E X-Stat-Signature: gs1sdau3tzm6eugkbd6epy81o3otg1bk X-Rspam-User: X-HE-Tag: 1765872116-64261 X-HE-Meta: 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 HTe2xqy2 aBa84AGjMtUScXXCZ58eTAAuVMNCLWYUdK0MRa7CNRN4Do35J1nJglm3blDjAo611nE5tn7JlQMJNFT1RyvYVYhli3RIARez6e56dcv8RYejmjpCOWK29Oc2TcYSuFWp8jebVddKt807Zk43CWW+3z9OgM82rGZ/dJHQgPW3XdqzWULXbE44jP284kJ4hO+TzxRr2xwFBPwwE7H3XFXMiQfhKWWwWWdtIgFfmWauD5eiQ4llRs+o4YaBq9vKEvzv71oRQRJrhmcMDc+ozivJUREI/RbrYBQfRyiMzUjGtdCVQgboUQNDdf5UxOQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a new DAMON sysfs file for setting and getting the newly introduced per-DAMON-snapshot level DAMOS deactivation control parameter, max_nr_snapshots. The file has a name same to the parameter and placed under the damos stat directory. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index a1f555e1125a..e198234f0763 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -205,6 +205,7 @@ struct damon_sysfs_stats { unsigned long sz_ops_filter_passed; unsigned long qt_exceeds; unsigned long nr_snapshots; + unsigned long max_nr_snapshots; }; static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) @@ -275,6 +276,28 @@ static ssize_t nr_snapshots_show(struct kobject *kobj, return sysfs_emit(buf, "%lu\n", stats->nr_snapshots); } +static ssize_t max_nr_snapshots_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + + return sysfs_emit(buf, "%lu\n", stats->max_nr_snapshots); +} + +static ssize_t max_nr_snapshots_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + unsigned long max_nr_snapshots, err = kstrtoul(buf, 0, &max_nr_snapshots); + + if (err) + return err; + stats->max_nr_snapshots = max_nr_snapshots; + return count; +} + static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); @@ -301,6 +324,9 @@ static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = static struct kobj_attribute damon_sysfs_stats_nr_snapshots_attr = __ATTR_RO_MODE(nr_snapshots, 0400); +static struct kobj_attribute damon_sysfs_stats_max_nr_snapshots_attr = + __ATTR_RW_MODE(max_nr_snapshots, 0600); + static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, @@ -309,6 +335,7 @@ static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_sz_ops_filter_passed_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, &damon_sysfs_stats_nr_snapshots_attr.attr, + &damon_sysfs_stats_max_nr_snapshots_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); @@ -2730,6 +2757,7 @@ static struct damos *damon_sysfs_mk_scheme( damon_destroy_scheme(scheme); return NULL; } + scheme->max_nr_snapshots = sysfs_scheme->stats->max_nr_snapshots; return scheme; } -- 2.47.3