delayacct_on is expected to be off most of the time, hence the compound is+static inline void delayacct_blkio(void)
+{
+ if (unlikely(current->delays && delayacct_on))
+ __delayacct_blkio();
+}
why is this unlikely?
Hmm, that it does :-(
+ 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 levelWill take another look if it can be done elsewhere. Earlier was using io_schedule but that isn't
currently.... since the number of entry points that needs measuring at
the current level is hardly finite...