Messages in this thread | | | From | Artem Bityutskiy <> | Subject | [PATCH v1 0/8] do not use s_dirt in ext2 | Date | Wed, 21 Mar 2012 18:14:27 +0200 |
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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.
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