Re: About read/write requests in IO scheduler

[韩磊]

Thank you very much!

2013/11/12 Jeff Moyer <jmoyer@xxxxxxxxxx>:
> 韩磊 <bonben1989@xxxxxxxxx> 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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