Revert "gfp: add __GFP_NOACCOUNT"

This reverts commit 8f4fc071b192 ("gfp: add __GFP_NOACCOUNT").

Black-list kmem accounting policy (aka __GFP_NOACCOUNT) turned out to be
fragile and difficult to maintain, because there seem to be many more
allocations that should not be accounted than those that should be.
Besides, false accounting an allocation might result in much worse
consequences than not accounting at all, namely increased memory
consumption due to pinned dead kmem caches.

So it was decided to switch to the white-list policy.  This patch
reverts bits introducing the black-list policy.  The white-list policy
will be introduced later in the series.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 8942af0..075b014 100644 (file)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -30,7 +30,6 @@ struct vm_area_struct;
 #define ___GFP_HARDWALL                0x20000u
 #define ___GFP_THISNODE                0x40000u
 #define ___GFP_ATOMIC          0x80000u
-#define ___GFP_NOACCOUNT       0x100000u
 #define ___GFP_NOTRACK         0x200000u
 #define ___GFP_DIRECT_RECLAIM  0x400000u
 #define ___GFP_OTHER_NODE      0x800000u
@@ -104,7 +103,6 @@ struct vm_area_struct;
 #define __GFP_HIGH     ((__force gfp_t)___GFP_HIGH)
 #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)
 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC)
-#define __GFP_NOACCOUNT        ((__force gfp_t)___GFP_NOACCOUNT)
 
 /*
  * Reclaim modifiers

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index cd0e241..2103f36 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -773,8 +773,6 @@ static inline bool __memcg_kmem_bypass(gfp_t gfp)
 {
        if (!memcg_kmem_enabled())
                return true;
-       if (gfp & __GFP_NOACCOUNT)
-               return true;
        if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
                return true;
        return false;

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 19423a4..25c0ad3 100644 (file)
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -122,8 +122,7 @@
 #define BYTES_PER_POINTER      sizeof(void *)
 
 /* GFP bitmask for kmemleak internal allocations */
-#define gfp_kmemleak_mask(gfp) (((gfp) & (GFP_KERNEL | GFP_ATOMIC | \
-                                          __GFP_NOACCOUNT)) | \
+#define gfp_kmemleak_mask(gfp) (((gfp) & (GFP_KERNEL | GFP_ATOMIC)) | \
                                 __GFP_NORETRY | __GFP_NOMEMALLOC | \
                                 __GFP_NOWARN)