linux-kernel - Re: [RFC] shmem: Add eventfd notification on utlilization level

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Message-id: <54FF0CD8.10709@gmail.com>
Date:	Tue, 10 Mar 2015 16:25:12 +0100
From:	Beata Michalska <b.k.m.devel@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Kyungmin Park <kmpark@...radead.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Hugh Dickins <hughd@...gle.com>, linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Linux Filesystem Mailing List <linux-fsdevel@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC] shmem: Add eventfd notification on utlilization level

On 03/10/2015 03:22 PM, Jan Kara wrote:
> On Tue 10-03-15 06:03:23, Christoph Hellwig wrote:
>> On Tue, Mar 10, 2015 at 10:51:41AM +0900, Kyungmin Park wrote:
>>> Any updates?
>> Please just add disk quota support to tmpfs so thast the standard quota
>> netlink notifications can be used.
>   If I understand the problem at hand, they are really interested in
> notification when running out of free space. Using quota for that doesn't
> seem ideal since that tracks used space per user, not free space on fs as a
> whole.
>
> But if I remember right there were discussions about ENOSPC notification
> from filesystem for thin provisioning usecases. It would be good to make
> this consistent with those but I'm not sure if it went anywhere.
>
> 								Honza

The ideal case here, would be to get the notification, despite the type
of the actual filesystem, whenever the amount of free space drops below
a certain level. Quota doesn't seem to be the right approach here.

BR
Beata Michalska

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