Re: [Patch 5/7] synchronous block I/O delays

> +static inline void delayacct_blkio(void)
> +{
> +	if (unlikely(current->delays && delayacct_on))
> +		__delayacct_blkio();
> +}

why is this unlikely?

> +	u64 blkio_delay;	/* wait for sync block io completion */

this misses O_SYNC, msync(), and general throttling.
I get the feeling this is being measured at the wrong level
currently.... since the number of entry points that needs measuring at
the current level is hardly finite...


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