On 1/25/12 8:29 AM, John Baldwin wrote:
So I've came up with this untested patch. It uses
VOP_ADVISE(FADV_DONTNEED) after read(2) calls to a NOREUSE region, and
leaves read-ahead caching enabled for NOREUSE. FADV_DONTNEED doesn't
do any good really for writes (it only flushes clean buffers), so I've
left write(2) operations as using IO_DIRECT still. Does this sound
reasonable?
That sounds like a good solution. If people want something from write they
can do it separately. For what it's worth, I would expect NOREUSE on
write to still do
write clustering but to free the buffer once it is written.
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