Re: [Lockmeter 2.5] BKL with 51ms hold time, prove me wrong

[Andrew Morton]

Hanna Linder <[e-mail]> wrote:
>
> 
> My original purpose was to verify my lockmeter port is producing 
> valid data so I was comparing to readprofile results. However, I saw 
> these high hold times and wanted to show them to you. Here is the 
> whole lockmeter output file: 
> http://prdownloads.sourceforge.net/lse/lockmeter.rmapm
> 
> Below is a snippet of lockmeter data from running Andrew Morton's
> rmap-test -m -i 10 -n 50 -s 600 -t 100 foo
> on a 2-way PIII 256MB RAM 500MHz System

I'm a bit surprised that even slow machine like that would take 50
milliseconds to truncate 128MB of file, but it's not impossible I guess. 
Truncate is not really a fastpath.  ext3 in -mm doesn't have any lock_kernels
in it.