From: Douglas Leeder <douglas.leeder@sophos.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Tvrtko Ursulin <tvrtko.ursulin@sophos.com>,
Eric Paris <eparis@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"malware-list@dmesg.printk.net" <malware-list@dmesg.printk.net>,
"Valdis.Kletnieks@vt.edu" <Valdis.Kletnieks@vt.edu>,
"greg@kroah.com" <greg@kroah.com>,
"jcm@redhat.com" <jcm@redhat.com>,
"tytso@mit.edu" <tytso@mit.edu>,
"arjan@infradead.org" <arjan@infradead.org>,
"david@lang.hm" <david@lang.hm>,
"jengelh@medozas.de" <jengelh@medozas.de>,
"aviro@redhat.com" <aviro@redhat.com>,
"mrkafk@gmail.com" <mrkafk@gmail.com>,
"alexl@redhat.com" <alexl@redhat.com>,
"a.p.zijlstra@chello.nl" <a.p.zijlstra@chello.nl>,
"hch@infradead.org" <hch@infradead.org>,
"alan@lxorguk.ukuu.org.uk" <alan@lxorguk.ukuu.org.uk>,
"mmorley@hcl.in" <mmorley@hcl.in>
Subject: Re: fanotify - overall design before I start sending patches
Date: Thu, 06 Aug 2009 11:20:57 +0100 [thread overview]
Message-ID: <4A7AAE89.20205@sophos.com> (raw)
In-Reply-To: <20090806101059.GD31370@elf.ucw.cz>
Pavel Machek wrote:
> On Wed 2009-08-05 17:46:16, Tvrtko Ursulin wrote:
>> On Wednesday 05 August 2009 03:05:34 Pavel Machek 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.
You mean that in 5 seconds, you won't have any point when you can tell
the kernel, "I'm still working"?
--
Douglas Leeder
WARNING: multiple messages have this Message-ID (diff)
From: Douglas Leeder <douglas.leeder-j34lQMj1tz/QT0dZR+AlfA@public.gmane.org>
To: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
Cc: "david-gFPdbfVZQbY@public.gmane.org"
<david-gFPdbfVZQbY@public.gmane.org>,
"Valdis.Kletnieks-PjAqaU27lzQ@public.gmane.org"
<Valdis.Kletnieks-PjAqaU27lzQ@public.gmane.org>,
"a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org"
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
"malware-list-h+Im9A44IAFcMpApZELgcQ@public.gmane.org"
<malware-list-h+Im9A44IAFcMpApZELgcQ@public.gmane.org>,
"mrkafk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<mrkafk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"aviro-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
<aviro-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"jengelh-nopoi9nDyk+ELgA04lAiVw@public.gmane.org"
<jengelh-nopoi9nDyk+ELgA04lAiVw@public.gmane.org>,
"hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org"
<hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"alexl-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
<alexl-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"jcm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
<jcm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org"
<alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>,
"arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org"
<arjan-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: fanotify - overall design before I start sending patches
Date: Thu, 06 Aug 2009 11:20:57 +0100 [thread overview]
Message-ID: <4A7AAE89.20205@sophos.com> (raw)
In-Reply-To: <20090806101059.GD31370-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
Pavel Machek wrote:
> On Wed 2009-08-05 17:46:16, Tvrtko Ursulin wrote:
>> On Wednesday 05 August 2009 03:05:34 Pavel Machek 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.
You mean that in 5 seconds, you won't have any point when you can tell
the kernel, "I'm still working"?
--
Douglas Leeder
next prev parent reply other threads:[~2009-08-06 10:21 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-24 20:13 fanotify - overall design before I start sending patches Eric Paris
2009-07-24 20:13 ` Eric Paris
2009-07-24 20:48 ` david
2009-07-24 20:48 ` david-gFPdbfVZQbY
2009-07-24 21:01 ` Eric Paris
2009-07-24 21:01 ` Eric Paris
2009-07-24 21:44 ` Jamie Lokier
2009-07-27 17:52 ` Evgeniy Polyakov
2009-07-29 20:11 ` Eric Paris
2009-07-24 21:00 ` Andreas Dilger
2009-07-24 21:00 ` Andreas Dilger
2009-07-24 21:21 ` Eric Paris
2009-07-24 22:42 ` Andreas Dilger
2009-07-24 23:01 ` Jamie Lokier
2009-07-24 22:48 ` Jamie Lokier
2009-07-24 23:25 ` Eric Paris
2009-07-24 23:25 ` Eric Paris
2009-07-24 23:46 ` Jamie Lokier
2009-07-24 23:49 ` Eric Paris
2009-07-24 23:49 ` Eric Paris
2009-07-25 0:29 ` Jamie Lokier
2009-07-27 18:33 ` Andreas Dilger
2009-07-27 19:23 ` Jamie Lokier
2009-07-28 17:59 ` Andreas Dilger
2009-07-29 20:14 ` Eric Paris
2009-07-29 20:14 ` Eric Paris
2009-07-29 20:12 ` Eric Paris
2009-07-29 20:12 ` Eric Paris
2009-07-29 20:07 ` Eric Paris
2009-07-27 16:54 ` Jan Kara
2009-07-27 16:54 ` Jan Kara
2009-07-25 14:22 ` Niraj kumar
2009-07-25 14:22 ` Niraj kumar
2009-07-29 20:08 ` Eric Paris
2009-07-28 11:48 ` Jon Masters
2009-07-29 20:20 ` Eric Paris
2009-07-29 20:20 ` Eric Paris
2009-08-03 16:23 ` Christoph Hellwig
2009-08-03 16:55 ` Eric Paris
2009-08-03 16:55 ` Eric Paris
2009-08-03 18:04 ` Christoph Hellwig
2009-08-03 18:13 ` Eric Paris
2009-08-03 18:13 ` Eric Paris
2009-08-04 16:09 ` Tvrtko Ursulin
2009-08-04 16:09 ` Tvrtko Ursulin
2009-08-04 16:27 ` Eric Paris
2009-08-04 16:27 ` Eric Paris
2009-08-04 16:39 ` Tvrtko Ursulin
2009-08-04 17:22 ` Valdis.Kletnieks
2009-08-04 17:22 ` Valdis.Kletnieks-PjAqaU27lzQ
2009-08-04 18:20 ` John Stoffel
2009-08-04 18:20 ` John Stoffel
2009-08-04 18:50 ` Eric Paris
2009-08-04 18:50 ` Eric Paris
2009-08-05 9:32 ` Tvrtko Ursulin
2009-08-05 9:32 ` Tvrtko Ursulin
2009-08-04 16:34 ` Tvrtko Ursulin
2009-08-05 10:12 ` Douglas Leeder
2009-08-05 10:12 ` Douglas Leeder
2009-08-05 10:35 ` Douglas Leeder
2009-08-05 2:05 ` Pavel Machek
2009-08-05 16:46 ` Tvrtko Ursulin
2009-08-06 10:10 ` Pavel Machek
2009-08-06 10:10 ` Pavel Machek
2009-08-06 10:20 ` Tvrtko Ursulin
2009-08-06 10:24 ` Pavel Machek
2009-08-06 10:20 ` Douglas Leeder [this message]
2009-08-06 10:20 ` Douglas Leeder
2009-08-06 10:22 ` Pavel Machek
2009-08-07 8:59 ` Jamie Lokier
2009-08-07 8:59 ` Jamie Lokier
2009-08-06 10:29 ` Peter Zijlstra
2009-08-06 10:59 ` Tvrtko Ursulin
2009-08-06 10:59 ` Tvrtko Ursulin
2009-08-06 11:23 ` Peter Zijlstra
2009-08-06 12:48 ` Tvrtko Ursulin
2009-08-06 12:58 ` Alan Cox
2009-08-06 12:58 ` Alan Cox
2009-08-06 18:18 ` Eric Paris
2009-08-06 18:18 ` Eric Paris
2009-08-06 13:50 ` Kernel Event Notification Subsystem (was: fanotify - overall design before I start sending patches) Al Boldi
2009-08-06 13:50 ` Al Boldi
2009-08-06 13:50 ` Al Boldi
2009-08-06 18:18 ` fanotify - overall design before I start sending patches Eric Paris
2009-08-06 18:18 ` Eric Paris
2009-08-07 16:36 ` Miklos Szeredi
2009-08-07 17:43 ` Eric Paris
2009-08-07 17:43 ` Eric Paris
2009-08-08 10:36 ` Pavel Machek
2009-08-10 10:03 ` Miklos Szeredi
2009-08-08 10:34 ` Pavel Machek
2009-08-08 10:34 ` Pavel Machek
2009-08-06 11:24 ` Pavel Machek
2009-08-06 11:24 ` Pavel Machek
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