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Subject[PATCH v2 1/4] mm: completely disable THP by transparent_hugepage=0
Date
Introduce "transparent_hugepage=0" to totally disable THP.
"transparent_hugepage=never" means setting THP to be partially
disabled, we need a new way to totally disable it.

Signed-off-by: WANG Cong <amwang@redhat.com>
---
Documentation/vm/transhuge.txt | 3 ++-
mm/huge_memory.c | 12 ++++++++++++
2 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index 0924aac..43c4d53 100644
--- a/Documentation/vm/transhuge.txt
+++ b/Documentation/vm/transhuge.txt
@@ -156,7 +156,8 @@ for each pass:
You can change the sysfs boot time defaults of Transparent Hugepage
Support by passing the parameter "transparent_hugepage=always" or
"transparent_hugepage=madvise" or "transparent_hugepage=never"
-(without "") to the kernel command line.
+(without "") to the kernel command line. To totally disable this
+feature, pass "transparent_hugepage=0".

== Need of application restart ==

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 81532f2..e4a4f2b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -488,6 +488,8 @@ static struct attribute_group khugepaged_attr_group = {
};
#endif /* CONFIG_SYSFS */

+static int no_hugepage_init;
+
static int __init hugepage_init(void)
{
int err;
@@ -501,6 +503,13 @@ static int __init hugepage_init(void)
goto out;
}

+ if (no_hugepage_init) {
+ err = 0;
+ transparent_hugepage_flags = 0;
+ printk(KERN_INFO "hugepage: totally disabled\n");
+ goto out;
+ }
+
#ifdef CONFIG_SYSFS
err = -ENOMEM;
hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
@@ -572,6 +581,9 @@ static int __init setup_transparent_hugepage(char *str)
clear_bit(TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
&transparent_hugepage_flags);
ret = 1;
+ } else if (!strcmp(str, "0")) {
+ no_hugepage_init = 1;
+ ret = 1;
}
out:
if (!ret)
--
1.7.4.4


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