linux-kernel - Re: About read/write requests in IO scheduler

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Message-ID: <CAK2Ky6ygXiHamJS_u0hGyZYvG0sUrSkWcEQ+VSRYbq9M-tHu-A@mail.gmail.com>
Date:	Tue, 12 Nov 2013 10:51:52 +0800
From:	韩磊 <bonben1989@...il.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: About read/write requests in IO scheduler

Thank you very much!

2013/11/12 Jeff Moyer <jmoyer@...hat.com>:
> 韩磊 <bonben1989@...il.com> writes:
>
>> In IO scheduler level, whether all the read requests are synchronous?
>
> Generically, yes, I/O schedulers (and the whole block layer, in fact)
> consider READs synchronous:
>
> /*
>  * We regard a request as sync, if either a read or a sync write
>  */
> static inline bool rw_is_sync(unsigned int rw_flags)
> {
>         return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
> }
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