mm: show message when updating min_free_kbytes in thp

min_free_kbytes may be raised during THP's initialization.  Sometimes,
this will change the value which was set by the user.  Showing this
message will clarify this confusion.

Only show this message when changing a value which was set by the user
according to Michal Hocko's suggestion.

Show the old value of min_free_kbytes according to Dave Hansen's
suggestion.  This will give user the chance to restore old value of
min_free_kbytes.

Signed-off-by: Han Pingtian <hanpt@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 9 insertions, 2 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 25fab7150fa0..afe738358370 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -130,8 +130,14 @@ static int 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) {
+                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);
+
                 min_free_kbytes = recommended_min;
+        }
         setup_per_zone_wmarks();
         return 0;
 }
diff --git a/mm/internal.h b/mm/internal.h
index dc95e979ae56..7e145e8cd1e6 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -99,6 +99,7 @@ extern void prep_compound_page(struct page *page, unsigned long order);
 #ifdef CONFIG_MEMORY_FAILURE
 extern bool is_free_buddy_page(struct page *page);
 #endif
+extern int user_min_free_kbytes;
 
 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a818d568ddf3..e3758a09a009 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -205,7 +205,7 @@ static char * const zone_names[MAX_NR_ZONES] = {
 };
 
 int min_free_kbytes = 1024;
-int user_min_free_kbytes;
+int user_min_free_kbytes = -1;
 
 static unsigned long __meminitdata nr_kernel_pages;
 static unsigned long __meminitdata nr_all_pages;