lkml.org 
[lkml]   [2007]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: LogFS take five
On Wed, 8 August 2007 19:27:17 +0300, Artem Bityutskiy wrote:
> On Wed, 2007-08-08 at 18:12 +0200, Jörn Engel wrote:
> > It has been a while, mainly because I found a bunch of races and didn't
> > want to publish anything before those were fixed. Patch is still
> > against 2.6.21 and just for review.
>
> I'm very interested how do you account free/dirty space in LogFS:

Independently of the position where data goes. There is a known amount
of space. Each write decreases that, each delete increases that.
-ENOSPC when it gets too low.

> * When you need to write new data, how do you select the place where to
> write?

Next position in the appropriate segment (you remember the level
concept, I'm sure).

> * When you run out of space, how do select find the segment to
> garbage-collect?

Most amount of free space usually. If space gets really tight, lower
levels are ignored.

> For any given segment (or eraseblock), how do you find amount of free
> and dirty space in it?

Scanning. I don't have seperate accounting yet.

Jörn

--
When in doubt, use brute force.
-- Ken Thompson
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-08-08 18:43    [W:0.166 / U:0.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site