From: Miroslav Benes <mbenes@suse.cz>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Torsten Duwe <duwe@lst.de>, Joao Moreira <jmoreira@suse.de>,
live-patching@vger.kernel.org, linux-kernel@vger.kernel.org,
mmarek@suse.cz, pmladek@suse.com, jikos@suse.cz, nstange@suse.de,
jroedel@suse.de, matz@suse.de, khlebnikov@yandex-team.ru,
jeyu@kernel.org
Subject: Re: [PATCH 0/8] livepatch: klp-convert tool
Date: Fri, 20 Oct 2017 15:39:49 +0200 (CEST) [thread overview]
Message-ID: <alpine.LSU.2.21.1710201537170.12558@san.suse.cz> (raw)
In-Reply-To: <20171020132432.majphjzzfrbcrdos@treble>
> > For -fpatchable-function-entries I switched
> > off IPA-RA, as especially on RISC there's _nothing_ you can do between
> > functions without at least one scratch reg. But for live patching, I'd like
> > the kernel to be compiled in the first place with 100% ABI adherence, IOW
> > all IPA optimisations turned off. Does anyone have numbers on the performance
> > impact?
>
> I agree that would be the best option.
>
> I don't think anyone has measured it because we don't know how to get
> the compiler to do that :-) My guess is that it will be something close
> to negligible.
I asked Nicolai to do some performance testing with all the options that
could be disabled disabled.
Miroslav
next prev parent reply other threads:[~2017-10-20 13:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-29 19:01 [PATCH 0/8] livepatch: klp-convert tool Joao Moreira
2017-08-29 19:01 ` [PATCH 1/8] livepatch: Create and include UAPI headers Joao Moreira
2017-08-29 19:01 ` [PATCH 2/8] kbuild: Support for Symbols.list creation Joao Moreira
2017-08-31 15:24 ` Joe Lawrence
2017-08-31 17:34 ` Josh Poimboeuf
2017-09-04 7:23 ` Joao Moreira
2017-08-29 19:01 ` [PATCH 3/8] livepatch: Add klp-convert tool Joao Moreira
2017-08-30 20:03 ` Joao Moreira
2017-08-29 19:01 ` [PATCH 4/8] livepatch: Add klp-convert annotation helpers Joao Moreira
2017-08-29 19:01 ` [PATCH 5/8] modpost: Integrate klp-convert Joao Moreira
2017-08-29 19:01 ` [PATCH 6/8] modpost: Add modinfo flag to livepatch modules Joao Moreira
2017-08-29 19:01 ` [PATCH 7/8] livepatch: Add sample livepatch module Joao Moreira
2017-08-29 19:01 ` [PATCH 8/8] documentation: Update on livepatch elf format Joao Moreira
2017-08-30 18:00 ` [PATCH 0/8] livepatch: klp-convert tool Josh Poimboeuf
2017-10-10 14:17 ` Miroslav Benes
2017-10-11 2:46 ` Josh Poimboeuf
2017-10-11 12:42 ` Joao Moreira
2017-10-19 13:01 ` Josh Poimboeuf
2017-10-19 13:24 ` Miroslav Benes
2017-10-19 14:03 ` Josh Poimboeuf
2017-10-19 14:27 ` Miroslav Benes
2017-10-19 15:15 ` Josh Poimboeuf
2017-10-19 16:00 ` Miroslav Benes
2017-10-19 16:20 ` Josh Poimboeuf
2017-10-20 8:51 ` Miroslav Benes
2017-10-20 12:03 ` Josh Poimboeuf
2017-10-20 12:44 ` Torsten Duwe
2017-10-20 13:24 ` Josh Poimboeuf
2017-10-20 13:39 ` Miroslav Benes [this message]
2017-10-20 13:44 ` Torsten Duwe
2017-10-20 14:20 ` Josh Poimboeuf
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