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Signed-off-by: Raghavendra K T --- mm/kscand.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) diff --git a/mm/kscand.c b/mm/kscand.c index 41321d373be7..a73606f7ca3c 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include "internal.h" @@ -173,6 +174,171 @@ static bool kscand_eligible_srcnid(int nid) return !node_is_toptier(nid); } +#ifdef CONFIG_SYSFS +static ssize_t scan_sleep_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_scan_sleep_ms); +} + +static ssize_t scan_sleep_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + kscand_scan_sleep_ms = msecs; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute scan_sleep_ms_attr = + __ATTR_RW(scan_sleep_ms); + +static ssize_t mm_scan_period_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_mm_scan_period_ms); +} + +/* If a value less than MIN or greater than MAX asked for store value is clamped */ +static ssize_t mm_scan_period_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs, stored_msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + stored_msecs = clamp(msecs, KSCAND_SCAN_PERIOD_MIN, KSCAND_SCAN_PERIOD_MAX); + + kscand_mm_scan_period_ms = stored_msecs; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute mm_scan_period_ms_attr = + __ATTR_RW(mm_scan_period_ms); + +static ssize_t mms_to_scan_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%lu\n", kscand_mms_to_scan); +} + +static ssize_t mms_to_scan_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return -EINVAL; + + kscand_mms_to_scan = val; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute mms_to_scan_attr = + __ATTR_RW(mms_to_scan); + +static ssize_t scan_enabled_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_scan_enabled ? 1 : 0); +} + +static ssize_t scan_enabled_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int err; + + err = kstrtouint(buf, 10, &val); + if (err || val > 1) + return -EINVAL; + + if (val) { + kscand_scan_enabled = true; + need_wakeup = true; + } else + kscand_scan_enabled = false; + + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute scan_enabled_attr = + __ATTR_RW(scan_enabled); + +static ssize_t target_node_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_target_node); +} + +static ssize_t target_node_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int err, node; + + err = kstrtoint(buf, 10, &node); + if (err) + return -EINVAL; + + kscand_sleep_expire = 0; + if (!node_is_toptier(node)) + return -EINVAL; + + kscand_target_node = node; + wake_up_interruptible(&kscand_wait); + + return count; +} +static struct kobj_attribute target_node_attr = + __ATTR_RW(target_node); + +static struct attribute *kscand_attr[] = { + &scan_sleep_ms_attr.attr, + &mm_scan_period_ms_attr.attr, + &mms_to_scan_attr.attr, + &scan_enabled_attr.attr, + &target_node_attr.attr, + NULL, +}; + +struct attribute_group kscand_attr_group = { + .attrs = kscand_attr, + .name = "kscand", +}; +#endif + static inline int kscand_has_work(void) { return !list_empty(&kscand_scan.mm_head); @@ -1231,11 +1397,45 @@ static int kscand(void *none) return 0; } +#ifdef CONFIG_SYSFS +extern struct kobject *mm_kobj; +static int __init kscand_init_sysfs(struct kobject **kobj) +{ + int err; + + err = sysfs_create_group(*kobj, &kscand_attr_group); + if (err) { + pr_err("failed to register kscand group\n"); + goto err_kscand_attr; + } + + return 0; + +err_kscand_attr: + sysfs_remove_group(*kobj, &kscand_attr_group); + return err; +} + +static void __init kscand_exit_sysfs(struct kobject *kobj) +{ + sysfs_remove_group(kobj, &kscand_attr_group); +} +#else +static inline int __init kscand_init_sysfs(struct kobject **kobj) +{ + return 0; +} +static inline void __init kscand_exit_sysfs(struct kobject *kobj) +{ +} +#endif + static inline void kscand_destroy(void) { kmem_cache_destroy(kscand_slot_cache); /* XXX: move below to kmigrated thread */ kmem_cache_destroy(kmigrated_slot_cache); + kscand_exit_sysfs(mm_kobj); } void __kscand_enter(struct mm_struct *mm) @@ -1421,6 +1621,10 @@ static int __init kscand_init(void) return -ENOMEM; } + err = kscand_init_sysfs(&mm_kobj); + if (err) + goto err_init_sysfs; + init_list(); err = start_kscand(); if (err) @@ -1437,6 +1641,7 @@ static int __init kscand_init(void) err_kscand: stop_kscand(); +err_init_sysfs: kscand_destroy(); return err; -- 2.34.1