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From: Mark Lord <kernel@teksavvy.com>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: Greg Freemyer <greg.freemyer@gmail.com>,
	Eric Sandeen <sandeen@redhat.com>,
	Lukas Czerner <lczerner@redhat.com>,
	Jeff Moyer <jmoyer@redhat.com>,
	linux-ext4@vger.kernel.org, Edward Shishkin <eshishki@redhat.com>,
	Eric Sandeen <esandeen@redhat.com>,
	Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/2] Add batched discard support for ext4.
Date: Mon, 26 Apr 2010 10:00:36 -0400	[thread overview]
Message-ID: <4BD59C84.4040200@teksavvy.com> (raw)
In-Reply-To: <4BD33B61.2080807@redhat.com>

On 24/04/10 02:41 PM, Ric Wheeler wrote:
..
> I don't like the user space wiper.sh approach in general, but running
> wiper.sh is entirely your choice.
>
> Most users prefer having the file system and the IO stack take care of
> this for them, but again, entirely configurable.
..

I wrote wiper.sh, and I would prefer more of an in-kernel solution,
simply because it could potentially have the smarts to deal with RAID,
LVM, and btrfs's own duplicate implementation of RAID/LVM.

Those cannot be done from userspace on a mounted filesystem.

So.. again.. in an ideal kernel, I'd like to see use of larger ranges
(and _multiple_ ranges) per TRIM command.  And options for the kernel
to do it automatically (-o discard), as well as an ioctl() interface
for userspace to "scrub" (or "wipe") all free ranges in a gradual fashion.

Cheers


  reply	other threads:[~2010-04-26 14:10 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-19 10:55 Ext4: batched discard support Lukas Czerner
2010-04-19 10:55 ` [PATCH 1/2] Add ioctl FITRIM Lukas Czerner
2010-04-19 10:55   ` [PATCH 2/2] Add batched discard support for ext4 Lukas Czerner
2010-04-20 21:21     ` Greg Freemyer
2010-04-21  2:26       ` Mark Lord
2010-04-21  2:45         ` Eric Sandeen
2010-04-21 18:59           ` Greg Freemyer
2010-04-21 19:04             ` Ric Wheeler
2010-04-21 19:22               ` Jeff Moyer
2010-04-21 20:44                 ` Greg Freemyer
2010-04-21 20:53                   ` Greg Freemyer
2010-04-21 21:01                   ` Eric Sandeen
2010-04-21 21:03                     ` Ric Wheeler
2010-04-21 21:47                       ` Greg Freemyer
2010-04-21 21:56                         ` James Bottomley
2010-04-21 21:59                         ` Mark Lord
2010-04-23  8:23                   ` Lukas Czerner
2010-04-24 13:24                     ` Greg Freemyer
2010-04-24 13:48                       ` Ric Wheeler
2010-04-24 14:30                         ` Greg Freemyer
2010-04-24 14:43                           ` Eric Sandeen
2010-04-24 15:03                             ` Greg Freemyer
2010-04-24 17:04                               ` Ric Wheeler
2010-04-24 18:30                                 ` Greg Freemyer
2010-04-24 18:41                                   ` Ric Wheeler
2010-04-26 14:00                                     ` Mark Lord [this message]
2010-04-26 14:42                                       ` Martin K. Petersen
2010-04-26 15:27                                         ` Greg Freemyer
2010-04-26 15:51                                           ` Lukas Czerner
2010-04-28  1:25                                           ` Mark Lord
2010-04-26 15:48                                         ` Ric Wheeler
2010-04-24 19:06                                   ` Martin K. Petersen
2010-04-26 14:03                                     ` Mark Lord
2010-04-24 18:39                       ` Martin K. Petersen
2010-04-26 16:55                     ` Jan Kara
2010-04-26 17:46                       ` Lukas Czerner
2010-04-26 17:52                         ` Ric Wheeler
2010-04-26 18:14                           ` Lukas Czerner
2010-04-26 18:28                             ` Jeff Moyer
2010-04-26 18:38                               ` [PATCH 2/2] Add batched discard support for ext4 - using rbtree Lukas Czerner
2010-04-26 18:42                                 ` Lukas Czerner
2010-04-27 15:29                                   ` Edward Shishkin
2010-04-21 20:52                 ` [PATCH 2/2] Add batched discard support for ext4 Greg Freemyer
2010-04-19 16:20 ` Ext4: batched discard support Greg Freemyer
2010-04-19 16:30   ` Eric Sandeen
2010-04-19 17:58     ` Greg Freemyer
2010-04-19 18:04       ` Ric Wheeler
2010-04-20 20:24   ` Mark Lord
2010-04-20 20:34     ` Mark Lord
  -- strict thread matches above, loose matches on Subject: below --
2010-07-07  7:53 Ext4: batched discard support - simplified version Lukas Czerner
2010-07-07  7:53 ` [PATCH 2/2] Add batched discard support for ext4 Lukas Czerner
2010-07-14  8:33   ` Dmitry Monakhov
2010-07-14  9:40     ` Lukas Czerner
2010-07-14 10:03       ` Dmitry Monakhov
2010-07-14 11:43         ` Lukas Czerner

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