On Sat, Oct 8, 2022 at 7:22 PM Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> On Thu, 06 Oct 2022 17:28:17 +0100,
> Denis Nikitin <denik@xxxxxxxxxxxx> 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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