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Date: Tue, 28 Oct 2008 19:14:49 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"menage@...gle.com" <menage@...gle.com>,
"xemul@...nvz.org" <xemul@...nvz.org>
Subject: [PATCH 3/4][mmotm] memcg: fix gfp_mask of callers of charge
fix misuse of gfp_kernel.
Now, most of callers of mem_cgroup_charge_xxx functions uses GFP_KERNEL.
I think that this is from the fact that page_cgroup *was* dynamically allocated.
But now, we allocate all page_cgroup at boot. And mem_cgroup_try_to_free_pages()
reclaim memory from GFP_HIGHUSER_MOVABLE + specified GFP_RECLAIM_MASK.
* This is because we just want to reduce memory usage.
"Where we should reclaim from ?" is not a problem in memcg.
This patch modifies gfp masks to be GFP_HIGUSER_MOVABLE if possible.
Note: This patch is not for fixing behavior but for showing sane information
in source code.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
mm/memcontrol.c | 8 +++++---
mm/memory.c | 9 +++++----
mm/shmem.c | 6 +++---
mm/swapfile.c | 2 +-
4 files changed, 14 insertions(+), 11 deletions(-)
Index: mmotm-2.6.28rc2+/mm/memcontrol.c
===================================================================
--- mmotm-2.6.28rc2+.orig/mm/memcontrol.c
+++ mmotm-2.6.28rc2+/mm/memcontrol.c
@@ -808,8 +808,9 @@ int mem_cgroup_prepare_migration(struct
}
unlock_page_cgroup(pc);
if (mem) {
- ret = mem_cgroup_charge_common(newpage, NULL, GFP_KERNEL,
- ctype, mem);
+ ret = mem_cgroup_charge_common(newpage, NULL,
+ GFP_HIGHUSER_MOVABLE,
+ ctype, mem);
css_put(&mem->css);
}
return ret;
@@ -888,7 +889,8 @@ int mem_cgroup_resize_limit(struct mem_c
ret = -EBUSY;
break;
}
- progress = try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL);
+ progress = try_to_free_mem_cgroup_pages(memcg,
+ GFP_HIGHUSER_MOVABLE);
if (!progress)
retry_count--;
}
Index: mmotm-2.6.28rc2+/mm/memory.c
===================================================================
--- mmotm-2.6.28rc2+.orig/mm/memory.c
+++ mmotm-2.6.28rc2+/mm/memory.c
@@ -1889,7 +1889,7 @@ gotten:
cow_user_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);
- if (mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))
+ if (mem_cgroup_newpage_charge(new_page, mm, GFP_HIGHUSER_MOVABLE))
goto oom_free_new;
/*
@@ -2324,7 +2324,7 @@ static int do_swap_page(struct mm_struct
lock_page(page);
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
- if (mem_cgroup_try_charge(mm, GFP_KERNEL, &ptr) == -ENOMEM) {
+ if (mem_cgroup_try_charge(mm, GFP_HIGHUSER_MOVABLE, &ptr) == -ENOMEM) {
ret = VM_FAULT_OOM;
unlock_page(page);
goto out;
@@ -2405,7 +2405,7 @@ static int do_anonymous_page(struct mm_s
goto oom;
__SetPageUptodate(page);
- if (mem_cgroup_newpage_charge(page, mm, GFP_KERNEL))
+ if (mem_cgroup_newpage_charge(page, mm, GFP_HIGHUSER_MOVABLE))
goto oom_free_page;
entry = mk_pte(page, vma->vm_page_prot);
@@ -2498,7 +2498,8 @@ static int __do_fault(struct mm_struct *
ret = VM_FAULT_OOM;
goto out;
}
- if (mem_cgroup_newpage_charge(page, mm, GFP_KERNEL)) {
+ if (mem_cgroup_newpage_charge(page,
+ mm, GFP_HIGHUSER_MOVABLE)) {
ret = VM_FAULT_OOM;
page_cache_release(page);
goto out;
Index: mmotm-2.6.28rc2+/mm/swapfile.c
===================================================================
--- mmotm-2.6.28rc2+.orig/mm/swapfile.c
+++ mmotm-2.6.28rc2+/mm/swapfile.c
@@ -535,7 +535,7 @@ static int unuse_pte(struct vm_area_stru
pte_t *pte;
int ret = 1;
- if (mem_cgroup_try_charge(vma->vm_mm, GFP_KERNEL, &ptr))
+ if (mem_cgroup_try_charge(vma->vm_mm, GFP_HIGHUSER_MOVABLE, &ptr))
ret = -ENOMEM;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
Index: mmotm-2.6.28rc2+/mm/shmem.c
===================================================================
--- mmotm-2.6.28rc2+.orig/mm/shmem.c
+++ mmotm-2.6.28rc2+/mm/shmem.c
@@ -920,8 +920,8 @@ found:
error = 1;
if (!inode)
goto out;
- /* Precharge page using GFP_KERNEL while we can wait */
- error = mem_cgroup_cache_charge(page, current->mm, GFP_KERNEL);
+ /* Charge page using GFP_HIGHUSER_MOVABLE while we can wait */
+ error = mem_cgroup_cache_charge(page, current->mm, GFP_HIGHUSER_MOVABLE);
if (error)
goto out;
error = radix_tree_preload(GFP_KERNEL);
@@ -1371,7 +1371,7 @@ repeat:
/* Precharge page while we can wait, compensate after */
error = mem_cgroup_cache_charge(filepage, current->mm,
- gfp & ~__GFP_HIGHMEM);
+ GFP_HIGHUSER_MOVABLE);
if (error) {
page_cache_release(filepage);
shmem_unacct_blocks(info->flags, 1);
--
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