From: Nick Desaulniers <ndesaulniers@google.com>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Bill Wendling <morbo@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
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>,
Nathan Chancellor <natechancellor@gmail.com>,
Sami Tolvanen <samitolvanen@google.com>
Subject: Re: [PATCH v7] pgo: add clang's Profile Guided Optimization infrastructure
Date: Thu, 28 Jan 2021 13:24:45 -0800 [thread overview]
Message-ID: <CAKwvOdnVic2MiVSkiTQGGKPFKtJrf=kt1LgjWejOK6mMtMiX3Q@mail.gmail.com> (raw)
In-Reply-To: <CA+icZUWJu0FWdRY0DMQxpYwjqq1WTB87y9u1-6t3YMmkR3UsBQ@mail.gmail.com>
On Thu, Jan 28, 2021 at 1:19 PM Sedat Dilek <sedat.dilek@gmail.com> wrote:
>
> On Thu, Jan 28, 2021 at 10:12 PM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
> >
> > On Thu, Jan 28, 2021 at 12:46 PM Sedat Dilek <sedat.dilek@gmail.com> wrote:
> > >
> > > [ LLVM ]
> > >
> > > Today, I switched over to LLVM version 12.0.0-rc1.
> > >
> > >
> > > [ Step #1: 5.11.0-rc5-5-amd64-clang12-pgo ]
> > >
> > > My first kernel was built with CONFIG_PGO_CLANG=y and LLVM=1 plus LLVM_IAS=1.
> > >
> > > [ start-build_5.11.0-rc5-5-amd64-clang12-pgo.txt ]
> > > dileks 193090 193065 0 06:54 pts/2 00:00:00 /usr/bin/perf_5.10
> > > stat make V=1 -j4 HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang
> > > LD=ld.lld LLVM=1 LLVM_IAS=1 PAHOLE=/opt/pahole/bin/pahole
> > > LOCALVERSION=-5-amd64-clang12-pgo KBUILD_VERBOSE=1
> > > KBUILD_BUILD_HOST=iniza KBUILD_BUILD_USER=sedat.dilek@gmail.com
> > > KBUILD_BUILD_TIMESTAMP=2021-01-28 bindeb-pkg
> > > KDEB_PKGVERSION=5.11.0~rc5-5~bullseye+dileks1
> > >
> > > Config: config-5.11.0-rc5-5-amd64-clang12-pgo
> > >
> > >
> > > [ Step #2: x86-64 defconfig & vmlinux.profdata ]
> > >
> > > Booted into 5.11.0-rc5-5-amd64-clang12-pgo and built an x86-64
> > > defconfig to generate/merge a vmlinux.profdata file.
> > >
> > > [ start-build_x86-64-defconfig.txt ]
> > > dileks 18430 15640 0 11:15 pts/2 00:00:00 make V=1 -j4
> > > HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang LD=ld.lld LLVM=1
> > > LLVM_IAS=1
> > >
> > > Script: profile_clang-pgo.sh
> > > Config: dot-config.x86-64-defconfig
> > >
> > >
> > > [ Step #3.1: 5.11.0-rc5-6-amd64-clang12-pgo & GNU-AS ]
> > >
> > > The first rebuild with CONFIG_PGO_CLANG=n and "LLVM=1
> > > KCFLAGS=-fprofile-use=vmlinux.profdata".
> > > I was able to boot into this one.
> > > Used assembler: GNU-AS 2.35.1
> > >
> > > [ start-build_5.11.0-rc5-6-amd64-clang12-pgo.txt ]
> > > dileks 65734 65709 0 11:54 pts/2 00:00:00 /usr/bin/perf_5.10
> > > stat make V=1 -j4 HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang
> > > LD=ld.lld PAHOLE=/opt/pahole/bin/pahole
> > > LOCALVERSION=-6-amd64-clang12-pgo KBUILD_VERBOSE=1
> > > KBUILD_BUILD_HOST=iniza KBUILD_BUILD_USER=sedat.dilek@gmail.com
> > > KBUILD_BUILD_TIMESTAMP=2021-01-28 bindeb-pkg
> > > KDEB_PKGVERSION=5.11.0~rc5-6~bullseye+dileks1 LLVM=1
> > > KCFLAGS=-fprofile-use=vmlinux.profdata
> > >
> > > Config: config-5.11.0-rc5-6-amd64-clang12-pgo
> > >
> > >
> > > [ Step #3.2: 5.11.0-rc5-7-amd64-clang12-pgo & Clang-IAS ]
> > >
> > > The second rebuild with CONFIG_PGO_CLANG=n and "LLVM=1
> > > KCFLAGS=-fprofile-use=vmlinux.profdata" plus LLVM_IAS=1.
> > > Compilable but NOT bootable in QEMU and on bare metal.
> > > Used assembler: Clang-IAS v12.0.0-rc1
> > >
> > > [ start-build_5.11.0-rc5-7-amd64-clang12-pgo.txt ]
> > > dileks 6545 6520 0 16:31 pts/2 00:00:00 /usr/bin/perf_5.10
> > > stat make V=1 -j4 HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang
> > > LD=ld.lld PAHOLE=/opt/pahole/bin/pahole
> > > LOCALVERSION=-7-amd64-clang12-pgo KBUILD_VERBOSE=1
> > > KBUILD_BUILD_HOST=iniza KBUILD_BUILD_USER=sedat.dilek@gmail.com
> > > KBUILD_BUILD_TIMESTAMP=2021-01-28 bindeb-pkg
> > > KDEB_PKGVERSION=5.11.0~rc5-7~bullseye+dileks1 LLVM=1
> > > KCFLAGS=-fprofile-use=vmlinux.profdata LLVM_IAS=1
> > >
> > > Config: config-5.11.0-rc5-7-amd64-clang12-pgo
> > >
> > >
> > > [ Conclusion ]
> > >
> > > The only statement I can tell you is a "PGO optimized" rebuild with
> > > LLVM_IAS=1 is compilable but NOT bootable.
> >
> > Thanks for the extensive testing and report. Can you compress, upload,
> > and post a link to your kernel image? I would like to take it for a
> > spin in QEMU and see if I can find what it's doing, then work
> > backwards from there.
> >
>
> Which files do you need?
> For QEMU: bzImage and initrd.img enough?
bzImage should be enough; I'll use my own initrd. If that boots for
me, maybe then I'll take a look with the initrd added.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2021-01-28 21:26 UTC|newest]
Thread overview: 123+ 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 [this message]
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
2021-06-14 16:03 ` Nick Desaulniers
2021-06-12 20:20 ` Fangrui Song
2021-06-12 20:31 ` Peter Zijlstra
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