Messages in this thread | | | Subject | Re: [PATCH] reduce the time of finding symbols for module | From | Ruslan Bilovol <> | Date | Tue, 17 Oct 2017 15:44:21 +0300 |
| |
Hi,
On 10/13/2017 04:18 PM, Torsten Duwe wrote: > On Fri, Oct 13, 2017 at 03:54:46PM +0300, Ruslan Bilovol wrote: >> Hi Li, >> >> On Wed, Mar 29, 2017 at 4:50 AM, Li Bin <huawei.libin@huawei.com> wrote: >>> Hi, >> [snip] >>> >>> Yeah, from 2014, we started to work on livepatch support on aarch64, and >>> in May 2015, we pushed the solution to the livepatch community[1] and gcc >>> community (mfentry feature on aarch64)[2]. And then, there were an another >>> gcc solution from linaro [3], which proposes to implement a new option >>> -fprolog-pad=N that generate a pad of N nops at the beginning of each >>> function, and AFAIK, Torsten Duwe from SUSE is still discussing this method >>> with gcc community. >>> >>> At this stage, we are validating the livepatch support on aarch64 based on >>> aarch64 mfentry feature. When the community has a clear plan, we are happy >>> to make adaptation and contribute our related work to the community, including >>> the kpatch-build support :-) >>> >>> [1] livepatch: add support on arm64 >>> https://lkml.org/lkml/2015/5/28/54 >>> [2] [AArch64] support -mfentry feature for arm64 >>> https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00756.html >>> [3] Kernel livepatching support in GCC >>> https://gcc.gnu.org/ml/gcc/2015-05/msg00267.html >>> [4] arm64: ftrace with regs for livepatch support >>> http://lists.infradead.org/pipermail/linux-arm-kernel/2016-January/401352.html >>> >> >> Since there is already -fpatchable-function-entry option committed by Torsten >> to gcc on 25 Jul [1], have you restarted your activities with AArch64 livepatch >> support? >> If yes, I'm interested in testing of that feature/patches on our hardware > > I also have the coresponding kernel patch(es) here. IIRC I already sent > tham to LKML. I'll re-send them once there are more gcc's with -fpatchable-function-entry > support out there.
Do you mean "[PATCH v3 0/2] arm64 live patching" [1] series?
I'm going to play with them and see how it works.
Another question: have you tested livepatching on Big Endian systems?
[1] https://lwn.net/Articles/697050
Thanks, Ruslan
| |