linux-kernel - Re: [PATCH 12/24] task_diag: add a new group to get tasks memory mappings (v2)

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Date:	Tue, 14 Jul 2015 22:02:19 -0400
From:	David Ahern <dsahern@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>, Andrey Vagin <avagin@...nvz.org>
CC:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Odintsov <pavel.odintsov@...il.com>
Subject: Re: [PATCH 12/24] task_diag: add a new group to get tasks memory
 mappings (v2)

On 7/14/15 2:08 PM, Oleg Nesterov wrote:
> On 07/06, Andrey Vagin wrote:
>>
>> +static int task_vma_num(struct mm_struct *mm)
>> +{
>> +	struct vm_area_struct *vma;
>> +	int n_vma = 0;
>> +
>> +	if (!mm || !atomic_inc_not_zero(&mm->mm_users))
>> +		return 0;
>> +
>> +	down_read(&mm->mmap_sem);
>> +	for (vma = mm->mmap; vma; vma = vma->vm_next, n_vma++)
>> +		;
>> +
>> +	up_read(&mm->mmap_sem);
>> +	mmput(mm);
>> +
>> +	return n_vma;
>> +}
>
> Hmm. How about
>
> 	int task_vma_num(struct mm_struct *mm)
> 	{
> 		return mm->map_count;
> 	}
>
> ?

makes sense. Thanks for the pointer.

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