The testcase 'thp04' of LTP will enable THP, do some testing, then disable it if it wasn't enabled. But this will leave a different value of min_free_kbytes if it has been set by admin. So I think it's better to restore the user defined value after disabling THP.
--- thp increases the value of min_free_kbytes in initialization. This will change the user defined value of min_free_kbytes. So try to restore the value when disabling thp. Signed-off-by: Han Pingtian <ha...@linux.vnet.ibm.com> --- mm/huge_memory.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 94a824f..276180b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -164,6 +164,15 @@ static int start_khugepaged(void) } else if (khugepaged_thread) { kthread_stop(khugepaged_thread); khugepaged_thread = NULL; + + if (user_min_free_kbytes >= 0) { + pr_info("restore min_free_kbytes from %d to user " + "defined %d when stopping khugepaged\n", + min_free_kbytes, user_min_free_kbytes); + + min_free_kbytes = user_min_free_kbytes; + setup_per_zone_wmarks(); + } } return err; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/