linux-kernel - Re: [RFC][PATCH 3/5] memcg: unmap, truncate, invalidate uncharege in batch

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Message-ID: <20090831110252.GH4770@balbir.in.ibm.com>
Date:	Mon, 31 Aug 2009 16:32:52 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH 3/5] memcg: unmap, truncate, invalidate uncharege
	in batch

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-08-28 13:25:42]:

> 
> We can do batched uncharge when
> 	- invalidate/truncte file
> 	- unmap range of pages.
> 
> This means we don't do "batched" uncharge in memory reclaim path.
> I think it's reasonable.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
>  mm/memory.c   |    2 ++
>  mm/truncate.c |    6 ++++++
>  2 files changed, 8 insertions(+)
> 
> Index: mmotm-2.6.31-Aug27/mm/memory.c
> ===================================================================
> --- mmotm-2.6.31-Aug27.orig/mm/memory.c
> +++ mmotm-2.6.31-Aug27/mm/memory.c
> @@ -909,6 +909,7 @@ static unsigned long unmap_page_range(st
>  		details = NULL;
> 
>  	BUG_ON(addr >= end);
> +	mem_cgroup_uncharge_batch_start();
>  	tlb_start_vma(tlb, vma);
>  	pgd = pgd_offset(vma->vm_mm, addr);
>  	do {
> @@ -921,6 +922,7 @@ static unsigned long unmap_page_range(st
>  						zap_work, details);
>  	} while (pgd++, addr = next, (addr != end && *zap_work > 0));
>  	tlb_end_vma(tlb, vma);
> +	mem_cgroup_uncharge_batch_end();
> 
>  	return addr;
>  }
> Index: mmotm-2.6.31-Aug27/mm/truncate.c
> ===================================================================
> --- mmotm-2.6.31-Aug27.orig/mm/truncate.c
> +++ mmotm-2.6.31-Aug27/mm/truncate.c
> @@ -272,6 +272,7 @@ void truncate_inode_pages_range(struct a
>  			pagevec_release(&pvec);
>  			break;
>  		}
> +		mem_cgroup_uncharge_batch_start();
>  		for (i = 0; i < pagevec_count(&pvec); i++) {
>  			struct page *page = pvec.pages[i];
> 
> @@ -286,6 +287,7 @@ void truncate_inode_pages_range(struct a
>  			unlock_page(page);
>  		}
>  		pagevec_release(&pvec);
> +		mem_cgroup_uncharge_batch_end();
>  	}
>  }
>  EXPORT_SYMBOL(truncate_inode_pages_range);
> @@ -327,6 +329,7 @@ unsigned long invalidate_mapping_pages(s
>  	pagevec_init(&pvec, 0);
>  	while (next <= end &&
>  			pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
> +		mem_cgroup_uncharge_batch_start();
>  		for (i = 0; i < pagevec_count(&pvec); i++) {
>  			struct page *page = pvec.pages[i];
>  			pgoff_t index;
> @@ -354,6 +357,7 @@ unsigned long invalidate_mapping_pages(s
>  				break;
>  		}
>  		pagevec_release(&pvec);
> +		mem_cgroup_uncharge_batch_end();
>  		cond_resched();
>  	}
>  	return ret;
> @@ -428,6 +432,7 @@ int invalidate_inode_pages2_range(struct
>  	while (next <= end && !wrapped &&
>  		pagevec_lookup(&pvec, mapping, next,
>  			min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
> +		mem_cgroup_uncharge_batch_start();
>  		for (i = 0; i < pagevec_count(&pvec); i++) {
>  			struct page *page = pvec.pages[i];
>  			pgoff_t page_index;
> @@ -477,6 +482,7 @@ int invalidate_inode_pages2_range(struct
>  			unlock_page(page);
>  		}
>  		pagevec_release(&pvec);
> +		mem_cgroup_uncharge_batch_end();
>  		cond_resched();
>  	}
>  	return ret;
>

This looks good to me
 

-- 
	Balbir
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