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From: Steven Whitehouse <swhiteho@redhat.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: David Howells <dhowells@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>, Karel Zak <kzak@redhat.com>,
	Jeff Layton <jlayton@redhat.com>,
	Miklos Szeredi <mszeredi@redhat.com>,
	Nicolas Dichtel <nicolas.dichtel@6wind.com>,
	Christian Brauner <christian@brauner.io>,
	Lennart Poettering <lennart@poettering.net>,
	Linux API <linux-api@vger.kernel.org>,
	Ian Kent <raven@themaw.net>,
	LSM <linux-security-module@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: file metadata via fs API
Date: Wed, 12 Aug 2020 10:43:24 +0100	[thread overview]
Message-ID: <d2d179c7-9b60-ca1a-0c9f-d308fc7af5ce@redhat.com> (raw)
In-Reply-To: <CAJfpegsVJo9e=pHf3YGWkE16fT0QaNGhgkUdq4KUQypXaD=OgQ@mail.gmail.com>

Hi,

On 12/08/2020 09:37, Miklos Szeredi wrote:
[snip]
>
> b) The awarded performance boost is not warranted for the use cases it
> is designed for.
>
> Thanks,
> Miklos
>

This is a key point. One of the main drivers for this work is the 
efficiency improvement for large numbers of mounts. Ian and Karel have 
already provided performance measurements showing a significant benefit 
compared with what we have today. If you want to propose this 
alternative interface then you need to show that it can sustain similar 
levels of performance, otherwise it doesn't solve the problem. So 
performance numbers here would be helpful.

Also - I may have missed this earlier in the discussion, what are the 
atomicity guarantees with this proposal? This is the other key point for 
the API, so it would be good to see that clearly stated (i.e. how does 
one use it in combination with the notifications to provide an up to 
date, consistent view of the kernel's mounts)

Steve.



  reply	other threads:[~2020-08-12  9:43 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 15:27 [GIT PULL] Mount notifications David Howells
2020-08-03 15:49 ` [GIT PULL] Filesystem Information David Howells
2020-08-03 16:42   ` Miklos Szeredi
2020-08-04  2:15     ` Ian Kent
2020-08-04 14:36       ` Miklos Szeredi
2020-08-05  1:33         ` Ian Kent
2020-08-05  8:00           ` Miklos Szeredi
2020-08-05 11:13             ` Ian Kent
2020-08-05  8:24         ` file metadata via fs API (was: [GIT PULL] Filesystem Information) Miklos Szeredi
2020-08-11 13:54           ` Miklos Szeredi
2020-08-11 14:08             ` Al Viro
2020-08-11 14:22               ` Miklos Szeredi
2020-08-11 14:31                 ` Al Viro
     [not found]                   ` <CAAgocE07=vVKpQhG+rjEGO=NEBKZ02gjg4TRPxECAc+RKrzn=Q@mail.gmail.com>
2020-08-11 14:36                     ` Al Viro
2020-08-11 14:36                   ` Miklos Szeredi
2020-08-11 14:42                     ` Al Viro
2020-08-11 14:47                       ` Miklos Szeredi
2020-08-11 15:20             ` Linus Torvalds
2020-08-11 15:30               ` Miklos Szeredi
2020-08-11 16:05                 ` Linus Torvalds
2020-08-11 18:49                   ` Miklos Szeredi
2020-08-11 19:31                     ` Lennart Poettering
2020-08-11 19:50                       ` Christian Brauner
2020-08-11 19:39                   ` Christian Brauner
2020-08-12  0:53                     ` Ian Kent
2020-08-11 15:39               ` Andy Lutomirski
2020-08-11 16:17                 ` Casey Schaufler
2020-08-11 16:30                   ` Linus Torvalds
2020-08-11 20:28                   ` Miklos Szeredi
2020-08-11 20:36                     ` Jann Horn
2020-08-11 20:56                       ` Miklos Szeredi
2020-08-11 21:17                         ` Andy Lutomirski
2020-08-11 21:18                         ` Linus Torvalds
2020-08-12  7:23                           ` Miklos Szeredi
2020-08-12 14:39                             ` Al Viro
2020-08-12 14:46                               ` Miklos Szeredi
2020-08-12 15:08                                 ` Al Viro
2020-08-12 15:13                                   ` Miklos Szeredi
2020-08-12 16:33                                     ` Al Viro
2020-08-12 17:16                                       ` Miklos Szeredi
2020-08-12 17:39                                         ` Al Viro
2020-08-12 18:33                                           ` Al Viro
2020-08-12 21:30                                             ` Al Viro
2020-08-18  9:41                                               ` Miklos Szeredi
2020-08-18  9:30                                             ` Miklos Szeredi
2020-08-12 15:22                                   ` David Howells
2020-08-11 21:20                     ` Al Viro
2020-08-11 21:35                     ` Casey Schaufler
2020-08-11 16:05               ` Al Viro
2020-08-11 16:09                 ` Linus Torvalds
2020-08-11 16:39                   ` Al Viro
2020-08-12 10:14               ` Karel Zak
2020-08-12 13:09                 ` Miklos Szeredi
2020-08-12 13:33                 ` David Howells
2020-08-12 13:54                   ` Miklos Szeredi
2020-08-12  0:05             ` David Howells
2020-08-12  7:55               ` Miklos Szeredi
2020-08-12  8:29               ` David Howells
2020-08-12  8:37                 ` Miklos Szeredi
2020-08-12  9:43                   ` Steven Whitehouse [this message]
2020-08-12 10:04                     ` file metadata via fs API Miklos Szeredi
2020-08-12 11:28                       ` Karel Zak
2020-08-12 12:43                         ` Miklos Szeredi
2020-08-13  8:52                           ` Karel Zak
2020-08-12 13:06                         ` David Howells
2020-08-13  1:01                           ` Ian Kent
2020-08-12 18:18               ` file metadata via fs API (was: [GIT PULL] Filesystem Information) Linus Torvalds
2020-08-12 19:34                 ` file metadata via fs API Steven Whitehouse
2020-08-12 19:50                   ` Linus Torvalds
2020-08-13  3:44                     ` Ian Kent
2020-08-13 10:36                     ` Karel Zak
2020-08-14  7:58                     ` Lennart Poettering
2020-08-17 11:32                     ` Steven Whitehouse
2020-08-17 17:15                       ` Linus Torvalds
2020-08-17 22:44                         ` Linus Torvalds
2020-08-18 12:50                           ` Miklos Szeredi
2020-08-18 18:51                             ` Linus Torvalds
2020-08-18 20:18                               ` Miklos Szeredi
2020-08-18 20:53                                 ` Linus Torvalds
2020-08-21 13:17                                   ` Miklos Szeredi
2020-08-19  2:29                               ` Al Viro
2020-08-13  3:53                 ` file metadata via fs API (was: [GIT PULL] Filesystem Information) Jeffrey E Altman
2020-08-14 17:05                   ` Linus Torvalds
2020-08-18 15:01                     ` Jeffrey E Altman
2020-08-14  8:06                 ` Lennart Poettering
2020-08-12 13:54             ` David Howells
2020-08-12 14:10               ` Miklos Szeredi
2020-08-12 14:23               ` David Howells
2020-08-03 22:48 ` [GIT PULL] Mount notifications Ian Kent

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