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b=D4RxI1Sr+Oi1uIxX486NzJf6dWhHzlpc28+YtDhju6ZSxfKzMGhdhjsFngntH5tbX 4CUowp6L33KlsDnUUu0KAWjSlPOcu3kVviKWH/kjUdbFnK4b0tsaF0i4VSJXIZyRTs BbksGSFQ/0I1ywkl9Pya3g0hSMjzrrmnmgfIptdsZ2czrgK00IYcXBNozEHO/KVbUa ZxzOyU00fLB8WxvhaCL+qUYfEh5z8gOqovcd+jWgr9xfwkxLN9qPbLo1Te3N+0s+7s +YYKizlQ75adz31sANHe2gbVn0S0Iz4Ua6dxoCCvJhEu7y1BIrEdVjZgoM9G+MXPsZ qq/FX5okWoFEw== 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 v2.1 15/28] mm/damon/sysfs-schemes: implement tried_regions//probes/ Date: Thu, 14 May 2026 07:08:48 -0700 Message-ID: <20260514140904.119781-16-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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: xy3673btzccsorrp8utctxqwruz5u8up X-Rspam-User: X-Rspamd-Queue-Id: 18453C000B X-Rspamd-Server: rspam07 X-HE-Tag: 1778767763-129313 X-HE-Meta: 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 M6dvcCab TER6nqWLCbiyPhR0lr3f/hmWPj5fQEW6hQVcE6BHj5z77VNdbwPXhUOfebeLc7ApXkGSDUhWMlBKDVjumFNmaUUdRKgs3C66InsCFgql4FZgEmKcVfINBxoRshcs6sKajdxH9R7bcLRIZaHZG/hRq5x7VaLfhmDZM/q8zA1dH3OBhURyT9nAulACDBKSORtWdlN0ilCk5nbgc7gZAvm3OzXqfS0+hm2X19kii3l7U+eWyzI3TB1/oJNuPy2BaFhQxUOXQaAHyXHSe2dGDTe2pNiCVCQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement a sysfs directory for showing the per-region probe hit counts. It is named 'probes/' and located under the DAMOS tried region directory. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 65 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 62 insertions(+), 3 deletions(-) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 5d966ac864193..b2dcbdf1840e4 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -10,6 +10,32 @@ #include "sysfs-common.h" +/* + * probes directory + */ + +struct damos_sysfs_probes { + struct kobject kobj; +}; + +static struct damos_sysfs_probes *damos_sysfs_probes_alloc(void) +{ + return kzalloc_obj(struct damos_sysfs_probes); +} + +static void damos_sysfs_probes_release(struct kobject *kobj) +{ + struct damos_sysfs_probes *probes = container_of(kobj, + struct damos_sysfs_probes, kobj); + + kfree(probes); +} + +static const struct kobj_type damos_sysfs_probes_ktype = { + .release = damos_sysfs_probes_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + /* * scheme region directory */ @@ -20,6 +46,7 @@ struct damon_sysfs_scheme_region { unsigned int nr_accesses; unsigned int age; unsigned long sz_filter_passed; + struct damos_sysfs_probes *probes; struct list_head list; }; @@ -34,10 +61,36 @@ 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; + sysfs_region->probes = NULL; INIT_LIST_HEAD(&sysfs_region->list); return sysfs_region; } +static int damos_sysfs_region_add_dirs( + struct damon_sysfs_scheme_region *region) +{ + struct damos_sysfs_probes *probes = damos_sysfs_probes_alloc(); + int err; + + if (!probes) + return -ENOMEM; + err = kobject_init_and_add(&probes->kobj, &damos_sysfs_probes_ktype, + ®ion->kobj, "probes"); + if (err) { + kobject_put(&probes->kobj); + return err; + } + + region->probes = probes; + return 0; +} + +static void damos_sysfs_region_rm_dirs( + struct damon_sysfs_scheme_region *region) +{ + kobject_put(®ion->probes->kobj); +} + static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -165,6 +218,7 @@ static void damon_sysfs_scheme_regions_rm_dirs( list_for_each_entry_safe(r, next, ®ions->regions_list, list) { /* release function deletes it from the list */ + damos_sysfs_region_rm_dirs(r); kobject_put(&r->kobj); regions->nr_regions--; } @@ -2998,9 +3052,14 @@ void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes, if (kobject_init_and_add(®ion->kobj, &damon_sysfs_scheme_region_ktype, &sysfs_regions->kobj, "%d", - sysfs_regions->nr_regions)) { - kobject_put(®ion->kobj); - } + sysfs_regions->nr_regions)) + goto out; + if (damos_sysfs_region_add_dirs(region)) + goto out; + return; + +out: + kobject_put(®ion->kobj); } int damon_sysfs_schemes_clear_regions( -- 2.47.3