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@xxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html