Hi,
On Sat, Feb 17, 2001 at 02:15:40PM -0800, Fireball Freddy wrote:
>
> o Eliminate BUF_CLEAN, BUF_DIRTY, and BUF_LOCKED
> lists in favor of a single BUF_LRU list. This because
> I don't see the point of maintaining three lists...
> the only time I need to find all the dirty blocks is
> on a sync of some sort. I don't mind if the sync
> takes a while longer if the normal operating condition
> is faster.
What if you have a gig of buffer cache in the system? You still need
to maintain the single LRU, so you're not going to be saving that much
on the main codepaths, and walking a gig of unnecessary buffer_heads
every kupdate() flush is not going to be cheap.
> It looks like the ext2 fs is going to complicate
> this somewhat, as it sets blocks dirty and/or writes
> them itself sometimes. Not sure how I'm going to get
> around this... will probably ignore it for now.
Yep, this behaviour on the superblock and group descriptors has hurt
people in the past.
Cheers,
Stephen
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