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SubjectRe: [PATCH] Introduce block I/O performance histograms
On Wed, Nov 15, 2006 at 07:15:52PM -0800, Edward Falk wrote:
> This patch introduces performance histogram record keeping for block
> I/O, used for performance tuning. It is turned off by default.
>
> When turned on, you simply do something like:
>
> # cat /sys/block/sda/read_request_histo
> rows = bytes columns = ms
> 10 20 50 100 200 500 1000 2000
> 2048 5 0 0 0 0 0 0 0
> 4096 0 0 0 0 0 0 0 0
> 8192 17231 135 41 10 0 0 0 0
> 16384 4400 24 6 2 0 0 0 0
> 32768 2897 34 4 4 0 0 0 0
> 65536 7089 87 5 1 2 0 0 0

Eeek, no, sysfs is for ONE VALUE PER FILE please.

Yes, I know there are some other sysfs files that do not follow this
rule, and we are working on fixing some of them, but please, don't add
new ones that do violate this rule.

thanks,

greg k-h
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