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Date: Fri, 22 Jan 2021 02:51:09 +0100 From: Sedat Dilek <sedat.dilek@...il.com> To: Nick Desaulniers <ndesaulniers@...gle.com> Cc: Bill Wendling <morbo@...gle.com>, Jonathan Corbet <corbet@....net>, Masahiro Yamada <masahiroy@...nel.org>, Linux Doc Mailing List <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, Clang-Built-Linux ML <clang-built-linux@...glegroups.com>, Andrew Morton <akpm@...ux-foundation.org>, Nathan Chancellor <natechancellor@...il.com>, Sami Tolvanen <samitolvanen@...gle.com> Subject: Re: [PATCH v6] pgo: add clang's Profile Guided Optimization infrastructure On Fri, Jan 22, 2021 at 2:44 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote: > > On Thu, Jan 21, 2021 at 2:35 AM Sedat Dilek <sedat.dilek@...il.com> wrote: > > > > Thanks for v6. > > > > Small Changelog nits: > > * Can you reverse-order the changelog - latest v6 first. > > * v4: s/Makfile changes and se/Ma*k*efile changes and *u*se > > > > Can you add a hint to this "Clang-PGO" patch requiring Clang >= 12? > > > > Can you please add a comment for people using Clang >= 12 (ToT) and > > have kernel-modules enabled, they will need the patch from CBL issue > > #1250? > > Otherwise they cannot boot and follow the next steps in the workflow. > > > > Can you put a comment about value "1" to reset the profiling counter? > > That there is no "0" value stopping it. > > > > Can you add an example for the workload test? > > Here I do a x86-64 defconfig build. > > See attached script. > > > > Usually, I download this patch from LORE. > > > > link="https://lore.kernel.org/r/20210111081821.3041587-1-morbo@google.com" > > b4 -d am $link > > > > This downloads v6. > > > > What if I want a previous version (compare)? > > Again, I will love to see a "clang-pgo" branch and maybe tags for the > > several versions in your personal GitHub. > > Come on, Bill :-). > > That's quite a long list, Sedat! Do you think some of these can be > follow ups, once the core lands? I'd much prefer to land the meat of > this and follow up quickly, than tire out poor Bill! :P > Poor Bill - he lost his hairs :-)? I hoped that the documentation gets a bit improved and clearer at some places. - Sedat -
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