Memory controller: make charging gfp mask aware

Nick Piggin pointed out that swap cache and page cache addition routines
could be called from non GFP_KERNEL contexts.  This patch makes the
charging routine aware of the gfp context.  Charging might fail if the
cgroup is over it's limit, in which case a suitable error is returned.

This patch was tested on a Powerpc box.  I am still looking at being able
to test the path, through which allocations happen in non GFP_KERNEL
contexts.

[kamezawa.hiroyu@jp.fujitsu.com: problem with ZONE_MOVABLE]
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 0ba224ea6ba4..153a54b2013c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1147,7 +1147,7 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa
         pte_t *pte;
         spinlock_t *ptl;
 
-        retval = mem_cgroup_charge(page, mm);
+        retval = mem_cgroup_charge(page, mm, GFP_KERNEL);
         if (retval)
                 goto out;
 
@@ -1650,7 +1650,7 @@ gotten:
         cow_user_page(new_page, old_page, address, vma);
         __SetPageUptodate(new_page);
 
-        if (mem_cgroup_charge(new_page, mm))
+        if (mem_cgroup_charge(new_page, mm, GFP_KERNEL))
                 goto oom_free_new;
 
         /*
@@ -2052,7 +2052,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 count_vm_event(PGMAJFAULT);
         }
 
-        if (mem_cgroup_charge(page, mm)) {
+        if (mem_cgroup_charge(page, mm, GFP_KERNEL)) {
                 delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
                 ret = VM_FAULT_OOM;
                 goto out;
@@ -2139,7 +2139,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 goto oom;
         __SetPageUptodate(page);
 
-        if (mem_cgroup_charge(page, mm))
+        if (mem_cgroup_charge(page, mm, GFP_KERNEL))
                 goto oom_free_page;
 
         entry = mk_pte(page, vma->vm_page_prot);
@@ -2277,7 +2277,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 
         }
 
-        if (mem_cgroup_charge(page, mm)) {
+        if (mem_cgroup_charge(page, mm, GFP_KERNEL)) {
                 ret = VM_FAULT_OOM;
                 goto out;
         }