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

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Date:	Tue, 10 Mar 2015 17:13:37 +0100 (CET)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	Beata Michalska <b.k.m.devel@...il.com>
cc:	Jan Kara <jack@...e.cz>, 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 Tue, 10 Mar 2015, Beata Michalska wrote:

> 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

A while back I was prototyping a netlink notification interface for
file systems, but it went nowhere.

https://lkml.org/lkml/2011/8/18/170

So maybe it's time get back to the drawing board and finish the
idea, since it seems to be some interest in this now.

-Lukas

> 
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