Don't hard-code 512M as the threshold in kernel, make it configruable, and set 512M by default. Signed-off-by: WANG Cong <amwang@xxxxxxxxxx> --- mm/Kconfig | 10 ++++++++++ mm/huge_memory.c | 2 +- 2 files changed, 11 insertions(+), 1 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index 8ca47a5..a826471 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -340,6 +340,16 @@ choice benefit. endchoice +config TRANSPARENT_HUGEPAGE_THRESHOLD + depends on TRANSPARENT_HUGEPAGE + int "The minimal threshold of enabling Transparent Hugepage" + range 512 8192 + default "512" + help + The threshold of enabling Transparent Huagepage automatically, + in Mbytes, below this value, Transparent Hugepage will be disabled + by default during boot. + # # UP and nommu archs use km based percpu allocator # diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 9c63c90..7fb44cc 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -544,7 +544,7 @@ static int __init hugepage_init(void) * where the extra memory used could hurt more than TLB overhead * is likely to save. The admin can still enable it through /sys. */ - if (totalram_pages < (512 << (20 - PAGE_SHIFT))) + if (totalram_pages < (CONFIG_TRANSPARENT_HUGEPAGE_THRESHOLD << (20 - PAGE_SHIFT))) transparent_hugepage_flags = 0; start_khugepaged(); -- 1.7.4.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>