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 <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Nate Zimmer <[email protected]> Cc: Cliff Wickman <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Wanpeng Li <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michel Lespinasse <[email protected]> Cc: Benjamin LaHaise <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Al Viro <[email protected]> Cc: David Rientjes <[email protected]> Cc: Zhang Yanfei <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Jiang Liu <[email protected]> Cc: Cody P Schafer <[email protected]> Cc: Glauber Costa <[email protected]> Cc: Kamezawa Hiroyuki <[email protected]> Cc: David Rientjes <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: [email protected] Cc: [email protected] --- 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
