Re: [2.5.70] possible problem with /dev/diskstats

Rick Lindsley (ricklind@us.ibm.com)
Sun, 01 Jun 2003 21:23:11 -0700


I've done some disk-io (compiled some software) and the values
now are even lower:

Interesting, yes, you now have 60 fewer "I/O's in flight."

Where exactly is the code in the kernel, that produces the diskstats file,
so I can try grepping through it?

The I/O's in flight are incremented in drive_stat_acct() (see ll_rw_blk.c)
and decremented in attempt_merge() and end_that_request_last(). My gut feel
is that end_that_request_last() is getting called more often than expected
via some interesting path, but I've nothing right now to back that up.

Rick
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/