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buffer and page caching



Hi Stephen,

I would like to know why ext3 uses both page caching and buffer caching, and if
unification is planed in the furture ?

It seems that page caching is now generic for file system in 2.4 , so ext3 use
it.
But  buffers seems also be used  for data and metadata accesses as i see
that   __block_commit_write() is called by ext3_commit_write() /
generic_commit_write()
whatever the journaled / ordered / ...  mode.

What are the impact/advantages on performances if these two levels of cache are
used together ?
I read that an unification of this is ongoing since 2.? is it true ?

Regards,
Eric






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