linux-kernel - Re: [PATCH] reduce the time of finding symbols for module

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Message-ID: <CAB=otbRWuX7pwk1vrjTFYfQctOLpGPxC=jvSf_xfpWQgxWkZKg@mail.gmail.com>
Date:   Fri, 13 Oct 2017 15:54:46 +0300
From:   Ruslan Bilovol <ruslan.bilovol@...il.com>
To:     Li Bin <huawei.libin@...wei.com>
Cc:     Jessica Yu <jeyu@...hat.com>, Miroslav Benes <mbenes@...e.cz>,
        zhouchengming <zhouchengming1@...wei.com>,
        live-patching@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        jpoimboe@...hat.com, jikos@...nel.org, pmladek@...e.com,
        Zefan Li <lizefan@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>, duwe@...e.de,
        rbilovol@...co.com
Subject: Re: [PATCH] reduce the time of finding symbols for module

Hi Li,

On Wed, Mar 29, 2017 at 4:50 AM, Li Bin <huawei.libin@...wei.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

[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=e6c4532a6d0f79b94f327d4f9a067faf3988a852

Thanks,
Ruslan