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bh=Rl5ADA+9J/l2w2quHKWsOoHjOvreI5jvhgmI+c48UlQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oM3BnEaqrscKBNF8aZ7Qv4bUFnq1511x+PkpIIIS2REY45nbPMpOv8JEeUgh4zEhC p55twps4xZ2Avb3RNPYl4LpuDOS2MDB54HPkJfmsjNlI3BvGUfs2KkrGa9TEXZUZuZ qSNHp5Pn/0mqEy4Itdm4PnEffr4tg0pa+EyrR/isB/V9XN4YEzyUY4MjgnFPs9j6IN U6dSqTzCDzJH/omWZUKusLgU+laMJp9DTYqQ8N8mkiUiDDwGr2SURXd4ypyUJhdqHb VVVNqZCYxVf8l89sUPc7pXCRDOtNWaB87mxS898ThR5m8oEafUv2I9NERjimMWOcyT RrgqxZIGUbX3A== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 12/17] mm/damon/sysfs: implement prep_action file Date: Mon, 31 Aug 2026 21:34:08 -0700 Message-ID: <20260901043417.2165-13-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901043417.2165-1-sj@kernel.org> References: <20260901043417.2165-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 544E4160002 X-Stat-Signature: byt6s3b5t8dk1swshycaaanbd8oj9wa9 X-Rspam-User: X-HE-Tag: 1788237270-858839 X-HE-Meta: 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 POvExkPy gA/dvR1VDDl+Di63qLmOCOcRmRy9cE370ybJZ7BJzQTPcoCW7H8pvempxBuYlT3RMidVnXhNU4cth30FNGrNq5OC0vfFYScCR4OPZvdsBo3kIbZfIEicK1XolaNEOcTtHFqE7FDmIRSrccL4igV0cTfsmOx2bH5cFDAPtuqDnWMrVggMCFRE+25eJzS6+JgyAq+QIDeD98HojMDoPpkCGuTXYIK3w22dPBxBDKqtHg69CNGEQWl19O8Z/5rbBX4Mn2FakgsohXN2sybOKfFiUFlawSg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a file named prep_action under the prep directory. It represents the corresponding probe preparation action. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 3749abb781566..1ecf194f71ddb 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -755,6 +755,7 @@ static const struct kobj_type damon_sysfs_intervals_ktype = { struct damon_sysfs_prep { struct kobject kobj; + enum damon_prep_action action; }; static struct damon_sysfs_prep *damon_sysfs_prep_alloc(void) @@ -764,9 +765,61 @@ static struct damon_sysfs_prep *damon_sysfs_prep_alloc(void) prep = kzalloc_obj(struct damon_sysfs_prep); if (!prep) return prep; + prep->action = DAMON_PREP_SET_PGIDLE; return prep; } +struct damon_sysfs_prep_action_name { + const enum damon_prep_action action; + const char *name; +}; + +static const struct damon_sysfs_prep_action_name +damon_sysfs_prep_action_names[] = { + { + .action = DAMON_PREP_SET_PGIDLE, + .name = "set_pgidle", + }, +}; + +static ssize_t prep_action_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_prep *prep = container_of(kobj, + struct damon_sysfs_prep, kobj); + int i; + + for (i = 0; i < ARRAY_SIZE(damon_sysfs_prep_action_names); i++) { + const struct damon_sysfs_prep_action_name *action_name; + + action_name = &damon_sysfs_prep_action_names[i]; + if (action_name->action == prep->action) + return sysfs_emit(buf, "%s\n", action_name->name); + } + return -EINVAL; +} + +static ssize_t prep_action_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_prep *prep = container_of(kobj, + struct damon_sysfs_prep, kobj); + ssize_t ret = -EINVAL; + int i; + + for (i = 0; i < ARRAY_SIZE(damon_sysfs_prep_action_names); i++) { + const struct damon_sysfs_prep_action_name *action_name; + + action_name = &damon_sysfs_prep_action_names[i]; + if (sysfs_streq(buf, action_name->name)) { + prep->action = action_name->action; + ret = count; + break; + } + } + return ret; +} + static void damon_sysfs_prep_release(struct kobject *kobj) { struct damon_sysfs_prep *prep = container_of(kobj, @@ -775,7 +828,11 @@ static void damon_sysfs_prep_release(struct kobject *kobj) kfree(prep); } +static struct kobj_attribute damon_sysfs_prep_prep_action_attr = + __ATTR_RW_MODE(prep_action, 0600); + static struct attribute *damon_sysfs_prep_attrs[] = { + &damon_sysfs_prep_prep_action_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_prep); -- 2.47.3