This chunk of the patch just adds the necessary page flags to support what I call a temporary compound page. Temporary compound pages provide us with the ability to turn a chunk of pages into a proper THP at some point after pulling them off the free list, but also allow us to fault in single 4K pages from the chunk. Signed-off-by: Alex Thorlton <athorlton@xxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Nate Zimmer <nzimmer@xxxxxxx> Cc: Cliff Wickman <cpw@xxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Michel Lespinasse <walken@xxxxxxxxxx> Cc: Benjamin LaHaise <bcrl@xxxxxxxxx> Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxx> Cc: Jiang Liu <jiang.liu@xxxxxxxxxx> Cc: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx> Cc: Glauber Costa <glommer@xxxxxxxxxxxxx> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: linux-mm@xxxxxxxxx --- include/linux/gfp.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 9b4dd49..6ec63dd 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -35,6 +35,7 @@ struct vm_area_struct; #define ___GFP_NO_KSWAPD 0x400000u #define ___GFP_OTHER_NODE 0x800000u #define ___GFP_WRITE 0x1000000u +#define ___GFP_COMP_TEMP 0x2000000u /* If the above are modified, __GFP_BITS_SHIFT may need updating */ /* @@ -77,6 +78,7 @@ struct vm_area_struct; #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ +#define __GFP_COMP_TEMP ((__force gfp_t)___GFP_COMP_TEMP) /* Treat as temp compound page */ #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. * This takes precedence over the @@ -121,6 +123,9 @@ struct vm_area_struct; #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ __GFP_NO_KSWAPD) +#define GFP_TEMP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP_TEMP | \ + __GFP_NOMEMALLOC | __GFP_NORETRY | \ + __GFP_NOWARN | __GFP_NO_KSWAPD) #ifdef CONFIG_NUMA #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) -- 1.7.12.4 -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>