On Mon, 21 Jun 1999, Marcelo Tosatti wrote:
> The buffer-head structure has a wait queue for processes blocked on it:
> struct wait_queue * b_wait;
> If 2 processes want read-only access we could wake up the both of them.
> (This is only useful on SMP systems, i think).
> This is already done in 2.2/2.3? This can be done?
in 2.3 we never block readers - of course if buffer contents represent
on-disk contents. So yes, in 2.3 we wake up all processes waiting for a
particular buffer to go uptodate - and they will all be able to use data
contents in parallel. (this 'wake-all' thing is a generic behavior, this
is why we have a per-buffer waitqueue)
-- mingo
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