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From: Peter Zijlstra <peterz@infradead.org>
To: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>, Bill Wendling <morbo@google.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	Fangrui Song <maskray@google.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	johannes.berg@intel.com, oberpar@linux.vnet.ibm.com,
	linux-toolchains@vger.kernel.org
Subject: Re: [PATCH v9] pgo: add clang's Profile Guided Optimization infrastructure
Date: Mon, 14 Jun 2021 17:46:39 +0200	[thread overview]
Message-ID: <20210614154639.GB68749@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <202106140817.F584D2F@keescook>

On Mon, Jun 14, 2021 at 08:26:01AM -0700, Kees Cook wrote:
> > 2. Like (1) but also keep GCOV, given proper support for attribute
> > no_instrument_function would probably fix it (?).
> > 
> > 3. Keep GCOV (and KCOV of course). Somehow extract PGO profiles from KCOV.
> > 
> > 4. Somehow extract PGO profiles from GCOV, or modify kernel/gcov to do so.
> 
> If there *is* a way to "combine" these, I don't think it makes sense
> to do it now. PGO has users (and is expanding[1]), and trying to
> optimize the design before even landing the first version seems like a
> needless obstruction, and to likely not address currently undiscovered
> requirements.

Even if that were so (and I'm not yet convinced), the current proposal
is wedded to llvm-pgo, there is no way gcc-pgo could reuse any of this
code afaict, which then means they have to create yet another variant.

Sorting this *before* the first version is exactly the right time.

Since when are we merging code when the requirements are not clear?

Just to clarify:

Nacked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

For all this PGO crud.

  parent reply	other threads:[~2021-06-14 15:46 UTC|newest]

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11  8:18 [PATCH] pgo: add clang's Profile Guided Optimization infrastructure Bill Wendling
2021-01-11  8:39 ` Sedat Dilek
2021-01-11  8:42   ` Sedat Dilek
2021-01-11  9:17   ` Bill Wendling
2021-01-11  9:57     ` Sedat Dilek
2021-01-11 18:28       ` Nathan Chancellor
2021-01-11 20:12 ` Fangrui Song
2021-01-11 20:23   ` Bill Wendling
2021-01-11 20:31     ` Fangrui Song
2021-01-12  0:37       ` Bill Wendling
2021-01-12  0:44         ` Fāng-ruì Sòng
2021-01-11 21:04 ` Nathan Chancellor
2021-01-11 21:17   ` Nick Desaulniers
2021-01-11 21:32     ` Bill Wendling
2021-01-12  5:14 ` [PATCH v2] " Bill Wendling
2021-01-12  5:17   ` Sedat Dilek
2021-01-12  5:31   ` [PATCH v3] " Bill Wendling
2021-01-12  9:10     ` kernel test robot
2021-01-12  9:10       ` kernel test robot
2021-01-12 17:22       ` Nathan Chancellor
2021-01-13  6:19     ` [PATCH v4] " Bill Wendling
2021-01-13 20:55       ` Nathan Chancellor
2021-01-13 21:59         ` Bill Wendling
2021-01-14  4:07         ` Nick Desaulniers
2021-01-16  0:01           ` Nick Desaulniers
2021-01-16  0:13             ` Nick Desaulniers
2021-01-16  4:30               ` Sedat Dilek
2021-01-16  5:07               ` Sedat Dilek
2021-01-16  5:18                 ` Sedat Dilek
2021-01-18  0:57               ` Sedat Dilek
2021-01-13 23:01       ` Nick Desaulniers
2021-01-16  9:43       ` [PATCH v5] " Bill Wendling
2021-01-16 17:38         ` Sedat Dilek
2021-01-16 18:36           ` Sedat Dilek
2021-01-16 20:23           ` Bill Wendling
2021-01-17 10:44             ` Sedat Dilek
2021-01-17 10:53               ` Sedat Dilek
2021-01-17 11:23                 ` Sedat Dilek
2021-01-17 11:42                   ` Sedat Dilek
2021-01-17 11:58                     ` Sedat Dilek
2021-01-17 12:05                       ` Sedat Dilek
2021-01-17 17:42                         ` Sedat Dilek
2021-01-17 20:34                           ` Bill Wendling
2021-01-17 23:33                             ` Sedat Dilek
2021-01-18  0:26                               ` Sedat Dilek
2021-01-18  2:32                                 ` Bill Wendling
2021-01-18 12:39                                   ` Sedat Dilek
2021-01-18 17:26                                     ` Sedat Dilek
2021-01-18 21:56                                       ` Bill Wendling
2021-01-18 23:29                                         ` Sedat Dilek
2021-01-21  2:03                                         ` Sedat Dilek
2021-01-21 22:44                                           ` Sedat Dilek
2021-01-22  1:42                                           ` Nick Desaulniers
2021-01-22  1:49                                             ` Sedat Dilek
2021-01-22  1:52                                               ` Nick Desaulniers
2021-01-22  1:54                                                 ` Sedat Dilek
2021-01-20  1:02         ` Nick Desaulniers
2021-01-21  0:51         ` Nick Desaulniers
2021-01-21  8:24           ` Bill Wendling
2021-01-21  8:24         ` [PATCH v6] " Bill Wendling
2021-01-21 10:34           ` Sedat Dilek
2021-01-22  1:44             ` Nick Desaulniers
2021-01-22  1:51               ` Sedat Dilek
2021-01-22  0:14           ` Sedat Dilek
2021-01-22  0:58             ` Sedat Dilek
2021-01-22  1:29           ` Nick Desaulniers
2021-01-22 10:11           ` [PATCH v7] " Bill Wendling
2021-01-22 11:31             ` Sedat Dilek
2021-01-22 18:41             ` Nick Desaulniers
2021-01-28 20:46               ` Sedat Dilek
2021-01-28 21:12                 ` Nick Desaulniers
2021-01-28 21:19                   ` Sedat Dilek
2021-01-28 21:24                     ` Nick Desaulniers
2021-01-28 21:39                       ` Sedat Dilek
2021-01-29  7:43               ` Sedat Dilek
2021-01-29 21:48                 ` Nick Desaulniers
2021-02-10 23:25             ` Bill Wendling
2021-02-22 21:52               ` Bill Wendling
2021-02-26 22:20             ` [PATCH v8] " Bill Wendling
2021-02-26 22:55               ` Bill Wendling
2021-02-28 18:52               ` Fangrui Song
2021-02-28 21:50                 ` Fangrui Song
2021-01-12 17:37   ` [PATCH v2] " Nick Desaulniers
2021-01-12 17:45     ` Fāng-ruì Sòng
2021-01-21  2:21 ` [PATCH] " Sedat Dilek
2021-01-22  1:34   ` Nick Desaulniers
2021-01-22  1:43     ` Sedat Dilek
2021-04-07 21:17 ` [PATCH v9] " Bill Wendling
2021-04-07 21:22   ` Kees Cook
2021-04-07 21:44     ` Fāng-ruì Sòng
2021-04-07 21:47   ` Nathan Chancellor
2021-04-07 21:58     ` Bill Wendling
2021-05-19 21:37   ` Kees Cook
2021-05-22 23:51     ` Bill Wendling
2021-05-31 21:12     ` Nathan Chancellor
2021-06-01 17:31       ` Nick Desaulniers
2021-06-12 16:59   ` Peter Zijlstra
2021-06-12 17:25     ` Bill Wendling
2021-06-12 18:15       ` Peter Zijlstra
2021-06-12 19:10         ` Bill Wendling
2021-06-12 19:28           ` Bill Wendling
2021-06-12 20:25           ` Peter Zijlstra
2021-06-12 20:56             ` Bill Wendling
2021-06-12 22:47               ` Bill Wendling
2021-06-13 18:07                 ` Bill Wendling
2021-06-14  9:43                   ` Peter Zijlstra
2021-06-14 10:18                     ` Peter Zijlstra
2021-06-14  7:51               ` Peter Zijlstra
2021-06-14  9:01               ` Peter Zijlstra
2021-06-14  9:39                 ` Bill Wendling
2021-06-14 10:44                   ` Peter Zijlstra
2021-06-14 11:41                     ` Bill Wendling
2021-06-14 11:43                     ` Bill Wendling
2021-06-14 14:16                     ` Marco Elver
2021-06-14 15:26                       ` Kees Cook
2021-06-14 15:35                         ` Peter Zijlstra
2021-06-14 16:22                           ` Kees Cook
2021-06-14 18:07                             ` Nick Desaulniers
2021-06-14 20:49                               ` Nick Desaulniers
2021-06-14 15:46                         ` Peter Zijlstra [this message]
2021-06-14 16:03                           ` Nick Desaulniers
2021-06-12 20:20         ` Fangrui Song
2021-06-12 20:31           ` Peter Zijlstra
2021-06-01 18:53 Kees Cook

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