linux-kernel - How to recognize synchronous write requests

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Message-ID: <CAC-yRPQL4Mdq9COjmATMmHym_+4PaC3cNxMECnwjCwakhuVGdg@mail.gmail.com>
Date:	Fri, 15 Jul 2011 20:01:13 +0430
From:	Amirali Shambayati <amirali.shambayati@...il.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	kernelnewbies@...nelnewbies.org
Subject: How to recognize synchronous write requests

Hi all,

As much as I know, type of an IO request can be realized by "DATA_DIR"
macro,but I wanted to know if it is possible to distinguish a read or
write is synchronous or asychronous.

I'm also using "blktrace" to extract requests dispatching to disk.
blktrace, determines synchrnous writes as "ws" and asynchronous writes
as "w".

Regards,

--
Amirali Shambayati
Bachelor Student
Computer Engineering Department
Sharif University of Technology
Tehran, Iran
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