set_recommended_min_free_kbytes need to honor min_free_kbytes set by the user. Post start-of-day THP enable or memory hotplug operations can lose user specified min_free_kbytes, in particular when it is higher than calculated recommended value. user_min_free_kbytes initialized to 0 to avoid undesired result when comparing with "unsigned long" type. Signed-off-by: Vijay Balakrishna <vijayb@xxxxxxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> --- mm/khugepaged.c | 3 ++- mm/page_alloc.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 4f7107476a6f..3c1147816d12 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2283,7 +2283,8 @@ static void set_recommended_min_free_kbytes(void) (unsigned long) nr_free_buffer_pages() / 20); recommended_min <<= (PAGE_SHIFT-10); - if (recommended_min > min_free_kbytes) { + if (recommended_min > min_free_kbytes || + recommended_min > user_min_free_kbytes) { if (user_min_free_kbytes >= 0) pr_info("raising min_free_kbytes from %d to %lu to help transparent hugepage allocations\n", min_free_kbytes, recommended_min); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fab5e97dc9ca..7b81fb139034 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -315,7 +315,7 @@ compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = { }; int min_free_kbytes = 1024; -int user_min_free_kbytes = -1; +int user_min_free_kbytes = 0; #ifdef CONFIG_DISCONTIGMEM /* * DiscontigMem defines memory ranges as separate pg_data_t even if the ranges -- 2.28.0