lkml.org 
[lkml]   [2018]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 0/4] Static calls
From
Date
On 12/12/18 05:59, Nadav Amit wrote:
> Thanks for cc’ing me. (I didn’t know about the other patch-sets.)
Well in my case, that's because I haven't posted any yet.  (Will follow up
 shortly with what I currently have, though it's not pretty.)

Looking at your patches, it seems you've got a much more developed learning
 mechanism.  Mine on the other hand is brutally simple but runs continuously
 (i.e. after we patch we immediately enter the next 'relearning' phase);
 since it never does anything but prod a handful of percpu variables, this
 shouldn't be too costly.

Also, you've got the macrology for making all indirect calls use this,
 whereas at present I just have an open-coded instance on a single call site
 (I went with deliver_skb in the networking stack).

So I think where we probably want to go from here is:
 1) get Josh's static_calls in.  AIUI Linus seems to prefer the out-of-line
    approach; I'd say ditch the inline version (at least for now).
 2) build a relpolines patch series that uses
   i) static_calls for the text-patching part
  ii) as much of Nadav's macrology as is applicable
 iii) either my or Nadav's learning mechanism; we can experiment with both,
      bikeshed it incessantly etc.

Seem reasonable?

-Ed

\
 
 \ /
  Last update: 2018-12-12 18:11    [W:0.098 / U:0.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site