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Date: Mon, 1 Dec 2008 19:05:34 +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>,
hugh@...itas.com, nickpiggin@...oo.com.au, knikanth@...e.de,
"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: [PATCH 3/4] memcg: explaing memcg's gfp_mask behavior in explicit
way.
mem_cgroup_xxx_charge(...gfpmask) function take gfpmask as its argument.
But this gfp_t is only used for check GFP_RECALIM_MASK. In other words,
memcg has no interst where the memory should be reclaimed from.
It just see usage of pages.
Using bare gfp_t is misleading and this is a patch for explaining
expected behavior in explicit way. (better name/code is welcome.)
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
include/linux/gfp.h | 19 +++++++++++++++++++
mm/filemap.c | 2 +-
mm/memory.c | 12 +++++++-----
mm/shmem.c | 8 ++++----
mm/swapfile.c | 2 +-
mm/vmscan.c | 3 +--
6 files changed, 33 insertions(+), 13 deletions(-)
Index: mmotm-2.6.28-Nov30/include/linux/gfp.h
===================================================================
--- mmotm-2.6.28-Nov30.orig/include/linux/gfp.h
+++ mmotm-2.6.28-Nov30/include/linux/gfp.h
@@ -245,4 +245,23 @@ void drain_zone_pages(struct zone *zone,
void drain_all_pages(void);
void drain_local_pages(void *dummy);
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+static inline gfp_t gfp_memcg_mask(gfp_t gfp)
+{
+ gfp_t mask;
+ /*
+ * Memory Resource Controller memory reclaim is called to reduce usage
+ * of memory, not to get free memory from specified area.
+ * Remove zone constraints.
+ */
+ mask = gfp & GFP_RECLAIM_MASK;
+ return mask | (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
+}
+#else
+static inline gfp_t gfp_memcg_mask(gfp_t gfp)
+{
+ return gfp;
+}
+#endif
+
#endif /* __LINUX_GFP_H */
Index: mmotm-2.6.28-Nov30/mm/filemap.c
===================================================================
--- mmotm-2.6.28-Nov30.orig/mm/filemap.c
+++ mmotm-2.6.28-Nov30/mm/filemap.c
@@ -461,7 +461,7 @@ int add_to_page_cache_locked(struct page
VM_BUG_ON(!PageLocked(page));
error = mem_cgroup_cache_charge(page, current->mm,
- gfp_mask & ~__GFP_HIGHMEM);
+ gfp_memcg_mask(gfp_mask));
if (error)
goto out;
Index: mmotm-2.6.28-Nov30/mm/vmscan.c
===================================================================
--- mmotm-2.6.28-Nov30.orig/mm/vmscan.c
+++ mmotm-2.6.28-Nov30/mm/vmscan.c
@@ -1733,8 +1733,7 @@ unsigned long try_to_free_mem_cgroup_pag
if (noswap)
sc.may_swap = 0;
- sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
- (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
+ sc.gfp_mask = gfp_memcg_mask(gfp_mask);
zonelist = NODE_DATA(numa_node_id())->node_zonelists;
return do_try_to_free_pages(zonelist, &sc);
}
Index: mmotm-2.6.28-Nov30/mm/memory.c
===================================================================
--- mmotm-2.6.28-Nov30.orig/mm/memory.c
+++ mmotm-2.6.28-Nov30/mm/memory.c
@@ -1913,7 +1913,8 @@ gotten:
cow_user_page(new_page, old_page, address, vma);
__SetPageUptodate(new_page);
- if (mem_cgroup_newpage_charge(new_page, mm, GFP_HIGHUSER_MOVABLE))
+ if (mem_cgroup_newpage_charge(new_page, mm,
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE)))
goto oom_free_new;
/*
@@ -2345,7 +2346,7 @@ static int do_swap_page(struct mm_struct
delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
if (mem_cgroup_try_charge_swapin(mm, page,
- GFP_HIGHUSER_MOVABLE, &ptr) == -ENOMEM) {
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE), &ptr) == -ENOMEM) {
ret = VM_FAULT_OOM;
unlock_page(page);
goto out;
@@ -2437,7 +2438,8 @@ static int do_anonymous_page(struct mm_s
goto oom;
__SetPageUptodate(page);
- if (mem_cgroup_newpage_charge(page, mm, GFP_HIGHUSER_MOVABLE))
+ if (mem_cgroup_newpage_charge(page, mm,
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE)))
goto oom_free_page;
entry = mk_pte(page, vma->vm_page_prot);
@@ -2528,8 +2530,8 @@ static int __do_fault(struct mm_struct *
ret = VM_FAULT_OOM;
goto out;
}
- if (mem_cgroup_newpage_charge(page,
- mm, GFP_HIGHUSER_MOVABLE)) {
+ if (mem_cgroup_newpage_charge(page, mm,
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE))) {
ret = VM_FAULT_OOM;
page_cache_release(page);
goto out;
Index: mmotm-2.6.28-Nov30/mm/swapfile.c
===================================================================
--- mmotm-2.6.28-Nov30.orig/mm/swapfile.c
+++ mmotm-2.6.28-Nov30/mm/swapfile.c
@@ -698,7 +698,7 @@ static int unuse_pte(struct vm_area_stru
int ret = 1;
if (mem_cgroup_try_charge_swapin(vma->vm_mm, page,
- GFP_HIGHUSER_MOVABLE, &ptr))
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE), &ptr))
ret = -ENOMEM;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
Index: mmotm-2.6.28-Nov30/mm/shmem.c
===================================================================
--- mmotm-2.6.28-Nov30.orig/mm/shmem.c
+++ mmotm-2.6.28-Nov30/mm/shmem.c
@@ -924,8 +924,8 @@ found:
* Charge page using GFP_HIGHUSER_MOVABLE while we can wait.
* charged back to the user(not to caller) when swap account is used.
*/
- error = mem_cgroup_cache_charge_swapin(page,
- current->mm, GFP_HIGHUSER_MOVABLE, true);
+ error = mem_cgroup_cache_charge_swapin(page, current->mm,
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE), true);
if (error)
goto out;
error = radix_tree_preload(GFP_KERNEL);
@@ -1267,7 +1267,7 @@ repeat:
* charge against this swap cache here.
*/
if (mem_cgroup_cache_charge_swapin(swappage,
- current->mm, gfp, false)) {
+ current->mm, gfp_memcg_mask(gfp), false)) {
page_cache_release(swappage);
error = -ENOMEM;
goto failed;
@@ -1385,7 +1385,7 @@ repeat:
/* Precharge page while we can wait, compensate after */
error = mem_cgroup_cache_charge(filepage, current->mm,
- GFP_HIGHUSER_MOVABLE);
+ gfp_memcg_mask(GFP_HIGHUSER_MOVABLE));
if (error) {
page_cache_release(filepage);
shmem_unacct_blocks(info->flags, 1);
--
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