On Wed, 19 Jul 2017, Andrew Morton wrote:
On Wed, 19 Jul 2017 15:54:27 -0700 Davidlohr Bueso <d...@stgolabs.net> wrote:
On Wed, 19 Jul 2017, Andrew Morton wrote:
>I do rather dislike these conversions from the point of view of
>performance overhead and general code bloat. But I seem to have lost
>that struggle and I don't think any of these are fastpath(?).
Well, since we now have fd25d19 (locking/refcount: Create unchecked atomic_t
implementation), performance is supposed to be ok.
Sure, things are OK for people who disable the feature.
But for people who want to enable the feature we really should minimize
the cost by avoiding blindly converting sites which simply don't need
it: simple, safe, old, well-tested code. Why go and slow down such
code? Need to apply some common sense here...
Fair points.
It would be lovely to have
some actual numbers nonetheless.
Very much so.
May I suggest using mmtests with the following config file:
https://github.com/gormanm/mmtests/blob/7e070a810bc0af92e592e5121d0ea75fada51aeb/configs/config-global-dhp__workload-ipc-scale-short
It will run two of Manfred's ipcscale sem benchmarks.
Thanks,
Davidlohr
