Messages in this thread | | | Date | Fri, 4 Dec 1998 15:07:07 GMT | From | "Stephen C. Tweedie" <> | Subject | SAR (was Re: disks stats through /proc) |
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Hi,
On Thu, 3 Dec 1998 13:39:42 +0000 (GMT), Tigran Aivazian <tigran@aivazian.demon.co.uk> said:
> IMHO, this should be done on a fine-grained (partition level) rather than > coarse (drive) level. There is enough information in > ll_rw_blk.c/add_request() to do it now but, of course, kernel_stat > structure will have to be seriously modified.
> There is something frustrating about the quality and speed of Linux > development. I.e. the quality is too high and the speed is too high, > in other words, I can implement this disk stat feature, but I bet > someone else has already done it and is just about to release his > patch to Linus soon...
Yep, done that. :)
I have patches for 2.0.34/35 and 2.1.125 already working, outputing both per-partition and per-spindle access stats via /proc/partitions. A "sard" front-end gives human-readable output. (It is modeled on the output of the SVR4 "sar -d" output.)
Currently you get average %utilisation; average request queue length; number of K transfered plus number of distinct IOs for reads, writes and combined; and average request service time for each disk and each partition.
Look for
ftp://ftp.uk.linux.org:/pub/linux/sct/fs/sard-0.2.tar.gz
for the patches and sard source code. The plan is to integrate this into 2.3 once we have got a more sensible kdev_t in the kernel.
--Stephen
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