lkml.org 
[lkml]   [2012]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v1 0/8] do not use s_dirt in ext2
Date
This patch-set makes ext2 independent of the VFS superblock management
services. Namely, ext2 does not require to register the 'write_super()' VFS
call-back.

The reason of this exercises is to get rid of the 'sync_supers()' kernel thread
which wakes up every 5 seconds (by default) even if all superblocks are clean.
This is wasteful from power management POW (unnecessary wake-ups).

Note, I tried to optimize 'sync_supers()' instead in 2010, but Al wanted me
to get rid of it instead. See https://lkml.org/lkml/2010/6/6/87
And I think this is right because many file-systems do not need this, for
example btrfs does not use VFS superblock management services at all, so on a
btrfs-based system we currently end-up useless periodic wake-ups source.

I have sent a similar patch-set for ext4 recently to Ted, see:
http://lkml.org/lkml/2012/3/20/220

Changes for other file-systems are coming later.

The patch-set structure.
1. patch 1 exports 'dirty_writeback_interval' and I also sent it as part of the
ext4 patch-set
2. patch 2 is also and independent VFS clean-up and I also sent it as part of
the ext4 patch-set
3. patch 3 is an independent ext2 clean-up patch
4. patches 4-8 actually make ext2 independent on the 'sync_supers()' thread.

Thanks,
Artem.


\
 
 \ /
  Last update: 2012-03-21 17:17    [W:0.582 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site