linux-kernel - Re: [RFC][2/3] Account and control virtual address space allocations

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Message-ID: <47DF167D.9040405@linux.vnet.ibm.com>
Date:	Tue, 18 Mar 2008 06:40:21 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	YAMAMOTO Takashi <yamamoto@...inux.co.jp>
CC:	linux-mm@...ck.org, hugh@...itas.com, skumar@...ux.vnet.ibm.com,
	menage@...gle.com, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	rientjes@...gle.com, xemul@...nvz.org, akpm@...ux-foundation.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [RFC][2/3] Account and control virtual address space allocations

YAMAMOTO Takashi wrote:
>> diff -puN mm/swapfile.c~memory-controller-virtual-address-space-accounting-and-control mm/swapfile.c
>> diff -puN mm/memory.c~memory-controller-virtual-address-space-accounting-and-control mm/memory.c
>> --- linux-2.6.25-rc5/mm/memory.c~memory-controller-virtual-address-space-accounting-and-control	2008-03-16 22:57:40.000000000 +0530
>> +++ linux-2.6.25-rc5-balbir/mm/memory.c	2008-03-16 22:57:40.000000000 +0530
>> @@ -838,6 +838,11 @@ unsigned long unmap_vmas(struct mmu_gath
>>  
>>  		if (vma->vm_flags & VM_ACCOUNT)
>>  			*nr_accounted += (end - start) >> PAGE_SHIFT;
>> +		/*
>> +		 * Unaccount used virtual memory for cgroups
>> +		 */
>> +		mem_cgroup_update_as(vma->vm_mm,
>> +					((long)(start - end)) >> PAGE_SHIFT);
>>  
>>  		while (start != end) {
>>  			if (!tlb_start_valid) {
> 
> i think you can sum and uncharge it with a single call.
> 

Like nr_accounted? I'll have to duplicate nr_accounted since that depends
conditionally on VM_ACCOUNT.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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