From: Denis Nikitin <denik@chromium.org>
To: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Nick Desaulniers <ndesaulniers@google.com>,
David Brazdil <dbrazdil@google.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
Manoj Gupta <manojgupta@google.com>
Subject: Re: [PATCH v2] KVM: arm64: nvhe: Fix build with profile optimization
Date: Mon, 10 Oct 2022 19:15:36 -0700 [thread overview]
Message-ID: <CADDJ8CVX5tZU9jL4FvTnvQxxVohhS76TVOoZAyy3k_Uit1efmA@mail.gmail.com> (raw)
In-Reply-To: <87sfjxhh4k.wl-maz@kernel.org>
On Sat, Oct 8, 2022 at 7:22 PM Marc Zyngier <maz@kernel.org> wrote:
>
> On Thu, 06 Oct 2022 17:28:17 +0100,
> Denis Nikitin <denik@chromium.org> wrote:
> >
> > Hi Mark,
>
> s/k/c/
>
> >
> > This problem currently blocks the PGO roll on the ChromeOS kernel and
> > we need some kind of a solution.
>
> I'm sorry, but I don't feel constrained by your internal deadlines. I
> have my own...
>
> > Could you please take a look?
>
> I have asked for a reproducer. All I got for an answer is "this is
> hard". Providing a profiling file would help, for example.
Could you please try the following profile on the 5.15 branch?
$ cat <<EOF > prof.txt
kvm_pgtable_walk:100:10
2: 5
3: 5
5: 5
6: 5
10: 5
10: _kvm_pgtable_walk:50
5: 5
7: 5
10: 5
13.2: 5
14: 5
16: 5 __kvm_pgtable_walk:5
13: kvm_pgd_page_idx:30
2: __kvm_pgd_page_idx:30
2: 5
3: 5
5: 5
2: kvm_granule_shift:5
3: 5
EOF
$ make LLVM=1 ARCH=arm64 KCFLAGS=-fprofile-sample-use=prof.txt -j8 vmlinux
Thanks,
Denis
>
> M.
>
> --
> Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2022-10-11 2:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-20 8:20 [PATCH] KVM: arm64: nvhe: Disable profile optimization Denis Nikitin
2022-09-20 9:33 ` Marc Zyngier
2022-09-21 0:08 ` Denis Nikitin
2022-09-21 6:02 ` Denis Nikitin
2022-09-21 17:25 ` Marc Zyngier
2022-09-22 5:31 ` [PATCH v2] KVM: arm64: nvhe: Fix build with " Denis Nikitin
2022-09-22 10:37 ` Marc Zyngier
2022-09-23 5:01 ` Denis Nikitin
[not found] ` <CAH=Qcsi3aQ51AsAE0WmAH9VmpqjOaQQt=ru5Nav4+d8F3fMPwQ@mail.gmail.com>
2022-09-29 16:13 ` Denis Nikitin
2022-10-06 16:28 ` Denis Nikitin
2022-10-09 2:20 ` Marc Zyngier
2022-10-11 2:15 ` Denis Nikitin [this message]
2022-10-13 11:09 ` Marc Zyngier
2022-10-13 19:02 ` Denis Nikitin
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