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Subject[PATCH 1/3] mm: completely disable THP by transparent_hugepage=never
Date
transparent_hugepage=never should mean to disable THP completely,
otherwise we don't have a way to disable THP completely.
The design is broken.

Signed-off-by: WANG Cong <amwang@redhat.com>
---
mm/huge_memory.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 81532f2..9c63c90 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -488,19 +488,26 @@ static struct attribute_group khugepaged_attr_group = {
};
#endif /* CONFIG_SYSFS */

+#define hugepage_enabled() khugepaged_enabled()
+
static int __init hugepage_init(void)
{
- int err;
+ int err = 0;
#ifdef CONFIG_SYSFS
static struct kobject *hugepage_kobj;
#endif

- err = -EINVAL;
if (!has_transparent_hugepage()) {
+ err = -EINVAL;
transparent_hugepage_flags = 0;
goto out;
}

+ if (!hugepage_enabled()) {
+ printk(KERN_INFO "hugepage: totally disabled\n");
+ goto out;
+ }
+
#ifdef CONFIG_SYSFS
err = -ENOMEM;
hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
--
1.7.4.4


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