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b=m7HxFeCaHrBTLlTWG8+buUOpiNnqvfr0i+qXOsXwg+vop3y7kwEJQ2OrS2h0If4kx LG/3OQGqYdfncWiqVsxIwLJ4NE2sse7JGbHCGI7ITXUuUA00gZa41WhGZXiicESW6N zwZumy7ARMNi9Qj3MCrGCtzb6Ol1vErJ61JfrW2cTiOVxeazUKkN91ulqhnWBFnB1R YHvVlbsP7Oy7//APJxss1XHJ6b/b3Wjr/uODztVxRbn1ZtT63Ikps0Naf8jK/UKgNM 6JStTtSwTRvU/oi+7ma4d4L6MgNHKctk13+N+z58m8EY0cu8iJbG0PubO+4aIIDUtC q+GOYSwrAPOhg== 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 08/12] mm/damon/sysfs-schemes: implement max_nr_snapshots file Date: Sun, 23 Nov 2025 10:43:22 -0800 Message-ID: <20251123184329.85287-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251123184329.85287-1-sj@kernel.org> References: <20251123184329.85287-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspam-User: X-Rspamd-Queue-Id: 92B2D4000F X-Stat-Signature: rinarbzn1p5mocx6dtbmxsynarmac4d8 X-HE-Tag: 1763923427-374782 X-HE-Meta: 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 S8BMV7bJ Mq4SfqSmmEjuScbG17Ol3vY4zHImpJCxCqvqidlQvI4b7qI/En6B5XzgLRrH0dKAmf/33P+NihkXozn/wf3wsRRoZivc1jrAvRb2LQwa/3WM728GSFO+m6io4kmY66kVyspGc13YSBrpAdIauHl11LNEMqPxTKnbCLEePJ/2tuLfMmVwT7tU6ul6JcS0xYc9MfudlrCvUp0X12JQYX+Nxpuh2mkGSL9gQ/XngXjTHxJN2U46Hf6LVOTarHG/9W5KhWUWulof2lDeWo6p557WvTs0NnxX5DCdC178rQlk/mir9B2e0bufXgTWHGQ== 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 4d25469f957f..bf1b637d4342 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); @@ -2731,6 +2758,7 @@ 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