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Date: Tue, 28 Oct 2008 21:07:31 +0900
From: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: nishimura@....nes.nec.co.jp,
"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>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"menage@...gle.com" <menage@...gle.com>,
"xemul@...nvz.org" <xemul@...nvz.org>
Subject: Re: [PATCH 3/4][mmotm] memcg: fix gfp_mask of callers of charge
On Tue, 28 Oct 2008 19:14:49 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> 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);
This line exceeds 80 characters.
Looks good to me except for that.
Reviewed-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> 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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