Re: About read/write requests in IO scheduler

[Jeff Moyer]

éç <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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