lkml.org 
[lkml]   [2012]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [dm-devel] [PATCH] Fix I/O counts in vmstat
Hi Mikulas,

> The decision whether bio is counted or not is made by the code that
> submits the bio. This leads to some problems:

How about convering dm targets to use generic_make_request?

Since submit_bio counts vm events, it seems natural for
caller to decide which function to use.
Device driver does not know whether the requested I/O is
for vm-to-device or device-to-device.
We could still use iostat to measure throughput of individual
block devices.

Thanks,
--
Jun'ichi Nomura, NEC Corporation


\
 
 \ /
  Last update: 2012-03-21 11:07    [W:0.062 / U:0.100 seconds]
©2003-2014 Jasper Spaans. Advertise on this site