Re: [RFC] GCC support for live-patching

2018-10-23 Thread Nicolai Stange
Hi Qing, Qing Zhao writes: > thanks a lot for your detailed explanation of the source based live patch > creation procedure. > really interesting and helpful information. > > more questions and comments below: > >>> >>> One question here, what’s the major benefit to prepare the patches >>>

Re: [RFC] GCC support for live-patching

2018-10-23 Thread Nicolai Stange
Hi, Qing Zhao writes: >> >> thanks for the proposal. The others have already expressed some of my >> worries and remarks, but I think it would be only right to write them >> again. Especially since I am part of the team responsible for >> implementation and maintenance of live patches here a

Performance impact of disabling non-clone IPA optimizations for the Linux kernel (was: "GCC options for kernel live-patching")

2018-10-23 Thread Nicolai Stange
Hi, let me summarize some results from performance comparisons of Linux kernels compiled with and without certain IPA optimizations. It's a slight abuse of this thread, but I think having the numbers might perhaps give some useful insights on the potential costs associated with the -flive-patchin