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SubjectRe: 2.5.59-mm5
>>>>> Andrew Morton (AM) writes:

AM> But writes are completely different. There is no dependency
AM> between them and at any point in time we know where on-disk a lot
AM> of writes will be placed. We don't know that for reads, which is
AM> why we need to twiddle thumbs until the application or filesystem
AM> makes up its mind.

it's significant that application doesn't want to wait read completion
long and doesn't wait for write completion in most cases.

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