From: "Martin Liška" <mliska@suse.cz>
To: Qing Zhao <qing.zhao@oracle.com>,
Richard Biener <richard.guenther@gmail.com>
Cc: gcc-patches@gcc.gnu.org, Martin Jambor <mjambor@suse.cz>,
live-patching@vger.kernel.org, Jan Hubicka <hubicka@ucw.cz>
Subject: Re: GCC options for kernel live-patching (Was: Add a new option to control inlining only on static functions)
Date: Wed, 03 Oct 2018 09:05:00 -0000 [thread overview]
Message-ID: <10e1c6e5-22cf-4a15-a897-42f4f6d6e5ad@suse.cz> (raw)
In-Reply-To: <2CB8EC20-9D88-4EAA-820A-71C52B71419D@oracle.com>
On 10/2/18 8:58 PM, Qing Zhao wrote:
>
>> On Oct 2, 2018, at 1:09 PM, Richard Biener <richard.guenther@gmail.com> wrote:
>>
>>>>>
>>>>
>>>> Yes, such IPA analyzes should be disabled. we need to identify a
>>> complete list of such analyzes.
>>>
>>> That was promised to be done by Honza HubiÄka. He's very skilled in IPA
>>> optimizations and he's aware
>>> of optimizations that cause troubles for live-patching.
>>
>> One could also compute the list of possibly affected functions from such semantic changes.
>
> theoretically, Yes.
>
> So, here comes the next question:
>
> what will be the better approach for helping live-patching?
>
> A. disable all the optimization/analyzes that changing a function based on other functions. this includes most of
> the IPA optimizations, inlining, cloning, ipa side effect analysis, etc.
>
> B. enable all such optimizations, but compute the list of possibly affected functions from those IPA optimizations.
>
> C. enable part of them and disable the other part of them. for the part of enabled ones, compute the list of possibly affected functions
> from them.
>
> Or, we might need an option to provide the support for all the above?
That's basically equal to disabling the optimizations via -fno-ipa-ra -fno-ipa-*.
>
> -fease-live-patching={NONE|ALL|C1|C2|â¦|Cn}
>
> NONE: disable all IPA optimizations;
> ALL: enable all IPA optimizations, compute the list of affected functions;
> C1:
> C2:
> â¦
> Cn:
>
> C1 to Cn will be part of the optimizations, for exmaple, C1 might be only-static-inline, C2 might be inline-clone, etc.
As said, I would like to see listed all possibly problematic optimizations with their corresponding flags.
Having that we can think about an -flive-patching option that will disable bunch of these flags.
Note that we are not sure we already have flags for all IPA optimizations that can possibly
influence live-patching. We've been working on the listing.
Martin
>
> any comments or suggestions?
>
> Qing
>
>
>>
>> Richard.
>>
>>> Martin
>
next prev parent reply other threads:[~2018-10-03 8:52 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 18:58 [PATCH][Middle-end][Version 3]Add a new option to control inlining only on static functions Qing Zhao
2018-09-18 23:18 ` Martin Sebor
2018-09-19 15:07 ` Qing Zhao
2018-09-21 15:19 ` [PATCH][Middle-end][Version 4]Add " Qing Zhao
2018-09-26 1:01 ` PING: " Qing Zhao
2018-09-26 11:20 ` Alexander Monakov
2018-09-26 12:49 ` Paolo Carlini
2018-09-26 14:43 ` Qing Zhao
2018-09-26 15:18 ` Alexander Monakov
2018-09-26 23:07 ` Qing Zhao
2018-09-26 23:54 ` Alexander Monakov
2018-09-27 5:16 ` Qing Zhao
2018-09-27 7:46 ` Richard Biener
2018-09-27 16:30 ` Qing Zhao
2018-09-27 8:55 ` Alexander Monakov
2018-09-27 8:58 ` Jan Hubicka
2018-09-27 11:12 ` Richard Biener
2018-09-26 13:24 ` Jason Merrill
2018-09-26 13:31 ` Richard Biener
2018-09-26 13:40 ` Jason Merrill
2018-09-26 14:46 ` Jeff Law
2018-09-26 14:58 ` Jason Merrill
2018-09-26 15:10 ` Jan Hubicka
2018-09-26 17:12 ` Qing Zhao
2018-09-26 17:22 ` Jan Hubicka
2018-09-26 21:36 ` Qing Zhao
2018-09-27 9:47 ` Jan Hubicka
2018-09-27 12:29 ` GCC options for kernel live-patching (Was: Add a new option to control inlining only on static functions) Martin Jambor
2018-09-27 16:40 ` Qing Zhao
2018-10-01 17:14 ` Qing Zhao
2018-10-02 8:38 ` Martin Jambor
2018-10-02 14:00 ` Qing Zhao
2018-10-02 14:11 ` Martin Liška
2018-10-02 14:55 ` Qing Zhao
2018-10-02 14:59 ` Martin Liška
2018-10-02 15:24 ` Qing Zhao
2018-10-02 17:16 ` Martin Liška
2018-10-02 18:34 ` Richard Biener
2018-10-02 21:25 ` Qing Zhao
2018-10-03 9:05 ` Martin Liška [this message]
2018-10-03 10:53 ` Martin Jambor
2018-10-03 16:11 ` Qing Zhao
2018-10-04 13:20 ` Richard Biener
2018-10-18 19:36 ` [RFC] GCC support for live-patching Qing Zhao
2018-10-19 8:53 ` Bernhard Reutner-Fischer
2018-10-19 18:33 ` Qing Zhao
2018-10-24 21:16 ` Alexandre Oliva
2018-10-19 14:25 ` Andi Kleen
2018-10-19 18:33 ` Qing Zhao
2018-10-20 6:47 ` Andi Kleen
2018-10-22 13:07 ` Martin Jambor
2018-10-22 17:59 ` Qing Zhao
2018-10-22 15:36 ` Miroslav Benes
2018-10-22 21:01 ` Qing Zhao
2018-10-23 9:37 ` Miroslav Benes
2018-10-23 19:54 ` Qing Zhao
2018-10-24 13:17 ` Miroslav Benes
2018-10-23 13:37 ` Nicolai Stange
2018-10-23 20:34 ` Qing Zhao
2018-10-23 21:18 ` Nicolai Stange
2018-10-24 17:19 ` Qing Zhao
2018-10-31 22:04 ` [RFC] [2nd version] " Qing Zhao
2018-10-31 22:08 ` [RFC] " Qing Zhao
2018-10-03 9:23 ` GCC options for kernel live-patching (Was: Add a new option to control inlining only on static functions) Jan Hubicka
2018-10-03 11:27 ` Martin Liška
2018-10-22 10:49 ` Martin Liška
[not found] ` <20181105095135.j3mnzox6rkktkoto@kam.mff.cuni.cz>
2018-11-05 22:26 ` Qing Zhao
2018-11-07 14:22 ` Martin Liška
2018-11-07 14:27 ` Jan Hubicka
2018-11-07 14:44 ` Martin Liška
2018-11-08 14:59 ` Jan Hubicka
2018-11-09 15:33 ` [PATCH][RFC] Come up with -flive-patching master option Martin Liška
2018-11-09 17:43 ` Qing Zhao
2018-11-10 8:51 ` Martin Liška
2018-11-12 2:28 ` Qing Zhao
2018-11-12 8:53 ` Martin Liška
2018-11-12 22:29 ` Qing Zhao
2018-11-13 17:49 ` Qing Zhao
2018-11-13 19:18 ` Miroslav Benes
2018-11-13 21:16 ` Qing Zhao
2018-11-14 15:03 ` Martin Liška
2018-11-14 17:54 ` Qing Zhao
2018-11-15 8:41 ` Martin Liška
2018-11-15 15:41 ` Qing Zhao
2018-11-16 1:36 ` [PATCH]Come " Qing Zhao
2018-11-16 15:26 ` Martin Liška
2018-11-16 15:51 ` Jan Hubicka
2018-11-16 16:25 ` Qing Zhao
2018-11-16 16:05 ` Qing Zhao
2018-11-19 8:12 ` Martin Liška
[not found] ` <F78B52B9-9F9A-4FA0-91BF-A33307D87AA8@oracle.c! ! om>
2018-11-19 15:53 ` Qing Zhao
2018-11-20 12:10 ` Martin Liška
2018-11-20 15:32 ` [PATCH][Version 3]Come " Qing Zhao
2018-11-26 15:54 ` PING: " Qing Zhao
2018-11-30 17:04 ` [wwwdocs] [PATCH]introduce new -flive-patching master option into gcc9 Qing Zhao
2018-11-30 18:29 ` Jeff Law
2018-11-30 20:44 ` Qing Zhao
2018-11-28 15:52 ` [PATCH][Version 3]Come up with -flive-patching master option Jan Hubicka
2018-11-28 20:25 ` Qing Zhao
2018-11-29 16:16 ` Qing Zhao
2018-12-05 23:16 ` Question on Disable no throw for " Qing Zhao
2019-01-02 11:47 ` Martin Liška
2019-01-09 11:28 ` Martin Liška
2018-12-07 13:07 ` [PATCH][Version 3]Come up with " Rainer Orth
2018-12-07 15:14 ` Qing Zhao
2019-04-10 14:46 ` Jonathan Wakely
2019-04-10 19:24 ` Qing Zhao
2019-04-10 20:01 ` Jonathan Wakely
2019-04-11 8:11 ` Richard Biener
2018-11-14 22:05 ` [PATCH][RFC] Come " Miroslav Benes
[not found] ` <20181110170343.g3k7j7rlydid3ahr@kam.mff.cuni.cz>
2018-11-12 9:29 ` Martin Liška
2018-11-09 18:38 ` Bernhard Reutner-Fischer
2018-11-10 8:48 ` Martin Liška
2018-10-03 12:18 ` GCC options for kernel live-patching (Was: Add a new option to control inlining only on static functions) Martin Jambor
2018-10-03 16:00 ` Qing Zhao
2018-10-23 12:34 ` Performance impact of disabling non-clone IPA optimizations for the Linux kernel (was: "GCC options for kernel live-patching") Nicolai Stange
2018-10-24 14:30 ` Jiri Kosina
2018-10-24 14:44 ` Miroslav Benes
2018-09-27 16:32 ` [PATCH][Middle-end][Version 4]Add a new option to control inlining only on static functions Qing Zhao
2018-09-26 22:42 ` Qing Zhao
2018-09-26 16:02 ` Qing Zhao
2018-09-26 15:52 ` Qing Zhao
2018-09-26 16:02 ` Jan Hubicka
2018-09-26 18:51 ` Qing Zhao
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