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

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Message-ID: <20150714180857.GC8088@redhat.com>
Date:	Tue, 14 Jul 2015 20:08:57 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	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>,
	David Ahern <dsahern@...il.com>,
	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 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;
	}

?

Oleg.

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