linux-kernel - Re: fanotify - overall design before I start sending patches

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Message-Id: <200908061120.26866.tvrtko.ursulin@sophos.com>
Date:	Thu, 6 Aug 2009 11:20:25 +0100
From:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Eric Paris <eparis@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"malware-list@...sg.printk.net" <malware-list@...sg.printk.net>,
	"Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>,
	"greg@...ah.com" <greg@...ah.com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Douglas Leeder <douglas.leeder@...hos.com>,
	"tytso@....edu" <tytso@....edu>,
	"arjan@...radead.org" <arjan@...radead.org>,
	"david@...g.hm" <david@...g.hm>,
	"jengelh@...ozas.de" <jengelh@...ozas.de>,
	"aviro@...hat.com" <aviro@...hat.com>,
	"mrkafk@...il.com" <mrkafk@...il.com>,
	"alexl@...hat.com" <alexl@...hat.com>,
	"jack@...e.cz" <jack@...e.cz>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"hch@...radead.org" <hch@...radead.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	"mmorley@....in" <mmorley@....in>
Subject: Re: fanotify - overall design before I start sending patches

On Thursday 06 August 2009 11:10:59 Pavel Machek wrote:
> On Wed 2009-08-05 17:46:16, Tvrtko Ursulin wrote:
> > Just to make sure you haven't missed this - it is not that they have to
> > complete the whole operation before the timeout period (since you mention
> > realtime/mlock I suspect this is what you think?), but _during_ the
> > operation they have to show that they are active by sending something
> > like keep alive messages.
> >
> > Or you are worried about failing to meet even that on a loaded system?
> > There has to be something like this otherwise hung userspace client would
> > kill the whole system.
>
> Of course, I'm worried about failing to meet this on loaded
> system. And the fact that I _have_ to worry about that means that
> interface is ugly/broken.

Would you prefer an infinite timeout instead? Maybe Eric could make it 
configurable. Or you have some other alternative ideas?

Tvrtko
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