Re: Balancing near the locking cliff, with some numbers

[Andi Kleen <ak@suse.de>]

Mr Linux,

On Monday 14 November 2005 13:03, linux@horizon.com wrote:

> This is very interesting data, thank you!
> This is using the standard IDE driver?
> And the path names were absolute?

Yes. No.

> 
> What would be really nice is a full trace of the locks acquired so we
> can look for specific problems.  (I can see the OpenSolaris folks puffing
> up to crow about dtrace already.)

> Barring that, a few variants like hot-cache cases, different file systems
> (includig tmpfs), and different device drivers would be informative.
> (You could also try the different ext3 journalling modes.)

I have no plans to generate such data right now, but if you want to
do it yourself I can send you my patches as a starting point. Should be easy enough
using relayfs.

> I'm not sre quite how you did this, but assuming you just installed global
> counters via macros 

per process counters.

> and ran the test by booting with init=

from a normal shell in a running system

-Andi