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bh=T5V8MjQrwRuDjd8BtOPEo73pYkdzDFHDiZ1CxZWMyKg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MMlE1TsiVFs3PvMr4gCgcOJWrIA9UUOf7HMF/b4Mk6yEXreOkh7n1/Rw7VhpccWQj KBN3ddQa4fQ176XoVxggxlqRC6IQmG281F8Ulg0vBL+gCKu3B5CXcAMi+AL3Iezo4U MJJx4AGXsI7kkRJ5PK/ytG8JRhx0VT1JbomuT/YsAD+mTy+qWgAVenh9FPFZBR86IG W/1e9AS1osWwDnrc2cb8jZJarkdCAxfd2wU/bUGPr7nOSXqbpJicd/oAMymsiNJ03l fzRr5fM5gGXFV1ERz0avaoKO+lcKRBlTUH/DrJ0yvYOz8bRt/5G4BCu4tBfHaD/QIy 6U5TkzfC3j9cA== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2.2 12/17] mm/damon/sysfs: implement prep_action file Date: Mon, 27 Jul 2026 21:12:33 -0700 Message-ID: <20260728041242.187380-13-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260728041242.187380-1-sj@kernel.org> References: <20260728041242.187380-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 1ozg8ig6t6hzknrpi96d846gi6d349wt X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: DEB2B80006 X-Rspam-User: X-HE-Tag: 1785211976-313009 X-HE-Meta: U2FsdGVkX19WtrLgqK3EwwU2R6m+GeM+2JSDEs/T6DQuhi6V82II8kkAzZoiCJMEvCJ+cshpc5NsG4tXEtV80wgzAX0x0gNK/+YNbcoVktfiRKEMcvOjmfwwvDPB3ZOtL8V4lK3JIDCeUqnuCwLujCZVZt6xzXMqBFiu8oVsvPJTxlqXXCp2oZeY7eU8/VvS1Se4wkn+WOEbZkMJhawcc63AcKpqASFoYKHVk0Vg5xUCDAEImUw1kgAqBk1KXGQB4HFEFU2SRkRJ5KqceBWFlyMyT7bsmnJOpIHdbZjxBrbKf5FrfFUZJ9QS8SGdFeEjERyHpfjSBq97x4orctoEg7W5XBX1NwQr1psodTKvR7bqHJoot4egdgjvd0edjLM+nsWHh6ljIkdo7w9/BlaYMXkgfKZYaVxm8dDtK1odr6mBXqqmSEQ7u6m7kuoxWUwajjD5i+p2zAf9ExYtMLaP4UNluTD6qAXi/mj104IXufJAz4HWnu3PPla9vZ6N1zpo881wc3bjimvIkuir+k8utdFZjVzSqED8LZ+B8+iKq6mz5AkdE8Tx7FD1/+CmIwCIjzQS3kS0EGo3Nd4c87ltb+/uKFWBykJTSUBrLQOAGtBH30nr8Z5uzkt8j8DT2Ih8+HRexNBDO7zd8qR3d91imAnM6fY1v1R9XWtAe1FcEPpchgFSKyNt5ImSsPUDYseYxgOiMR6Pw5AG4F2/S3WwcZZ1gB+fI2Ks23rzOD7lG8nLq2egF6E+hOOBY3Ggj44969wVgUa9SlKGGG/3WWCRprdualx/U2H77H6dxftUob9JalG8H722KYvB5RaaQ3jjI9PxQStLRCKdFSV5QbWTFp9+NxSWSvHQOHRcCpdVkIozjVr2K4Sd/RLhBJMfQPhJpJoyFf4uSM1eXQZPFx+H8nfEost5Jl/gdpxs/2BQDccmn1pC1+UJZheHlMiUMM4LJHRjKmTfXw+aFCTuC+v yn6KouiF fk1kZQUxMLTZiYiI19cywdSpd+TlekHAVlZECJ39TUawT6Ory6731nmZ40phjkyh/Y/vaRCD/mPfzh2vJhlf6JlIlS9hTAmj3cs3lItS62ruVLgxlYHgE6+6FP2EAC51zJO+FS2XA48mK0RcsE+TaexP9neeqVg+AyY285OYiJ442okzW6KaOYFyCMcugVPW501ARhAA2GDpPHX4bejo5s/N1NzOhcWoH8c4gcwtHg6H3NOQ0S6RsMgI+CnWiJ2JBDCX297EZHjaDXAaoOOK1wVW/2Q== 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 afd39659d6b84..c0130843223d7 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -756,6 +756,7 @@ 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) @@ -765,9 +766,61 @@ 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, @@ -776,7 +829,11 @@ 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