Re: [RFC PATCH v1] tools/mm: Add thpmaps script to dump THP usage info

[Barry Song <21cnbao@gmail.com>]

On Wed, Jan 3, 2024 at 9:25 PM Ryan Roberts <ryan.roberts@arm.com> wrote:
>
> On 03/01/2024 08:07, William Kucharski wrote:
> >
> >> On Jan 2, 2024, at 23:44, Barry Song <21cnbao@gmail.com> wrote:
> >>
> >> Hi Ryan,
> >>
> >> I ran a couple of test cases with different parameters, it seems to
> >> work correctly.
> >> just i don't understand the below, what is the meaning of 000000ce at
> >> the beginning of
> >> each line?
> >
> > It's the pid; 0xce is the specified pid, 206.
>
> Yes indeed. I added the pid to the front for the case where you are using
> --cgroup without --summary; in that case, each vma will be printed for each pid
> in the cgroup and it seemed sensible to be able to see which pid each vma
> belonged to.

I don't understand why we have to add the pid before each line as this tool
already has pid in the parameter :-)  this seems like duplicated information
to me. but it doesn't matter too much as this tool is really nice though it is
not so easy to deploy on Android.

Please feel free to add,

Tested-by: Barry Song <v-songbaohua@oppo.com>

>
> >
> > Perhaps the pid should be printed in decimal?
>
> I thought about printing in decimal, but every other value in the vma is in hex
> without a leading "0x" (I'm trying to follow the smaps convention). So I thought
> it could be more confusing in decimal.
>
> I'm happy to change it to decimal if that's the preference though? Although I'd
> like to continue to present it in a fixed width field, padded with 0s on the
> left so that everything lines up.
>
> >
> >     -- William Kucharski
> >
> >> /thpmaps  --pid 206 --cont 64K
> >> 000000ce 0000aaaadbb20000-0000aaaadbb21000 r-xp 00000000 fe:00
> >> 00426969 /root/a.out
> >> 000000ce 0000aaaadbb3f000-0000aaaadbb40000 r--p 0000f000 fe:00
> >> 00426969 /root/a.out
> >> 000000ce 0000aaaadbb40000-0000aaaadbb41000 rw-p 00010000 fe:00
> >> 00426969 /root/a.out
> >> 000000ce 0000ffff702c0000-0000ffffb02c0000 rw-p 00000000 00:00 00000000
> >> anon-thp-aligned-64kB:            473920 kB (100%)
> >> anon-cont-aligned-64kB:           473920 kB (100%)
> >> 000000ce 0000ffffb02c0000-0000ffffb044c000 r-xp 00000000 fe:00
> >> 00395429 /usr/lib/aarch64-linux-gnu/libc.so.6
> >> 000000ce 0000ffffb044c000-0000ffffb045d000 ---p 0018c000 fe:00
> >> 00395429 /usr/lib/aarch64-linux-gnu/libc.so.6
> >> 000000ce 0000ffffb045d000-0000ffffb0460000 r--p 0018d000 fe:00
> >> 00395429 /usr/lib/aarch64-linux-gnu/libc.so.6
> >> 000000ce 0000ffffb0460000-0000ffffb0462000 rw-p 00190000 fe:00
> >> 00395429 /usr/lib/aarch64-linux-gnu/libc.so.6
> >> 000000ce 0000ffffb0462000-0000ffffb046f000 rw-p 00000000 00:00 00000000
> >> 000000ce 0000ffffb0477000-0000ffffb049d000 r-xp 00000000 fe:00
> >> 00393893 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1
> >> 000000ce 0000ffffb04b0000-0000ffffb04b2000 rw-p 00000000 00:00 00000000
> >> 000000ce 0000ffffb04b2000-0000ffffb04b4000 r--p 00000000 00:00 00000000 [vvar]
> >> 000000ce 0000ffffb04b4000-0000ffffb04b5000 r-xp 00000000 00:00 00000000 [vdso]
> >> 000000ce 0000ffffb04b5000-0000ffffb04b7000 r--p 0002e000 fe:00
> >> 00393893 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1
> >> 000000ce 0000ffffb04b7000-0000ffffb04b9000 rw-p 00030000 fe:00
> >> 00393893 /usr/lib/aarch64-linux-gnu/ld-linux-aarch64.so.1
> >> 000000ce 0000ffffdaba4000-0000ffffdabc5000 rw-p 00000000 00:00 00000000 [stack]
> >

Thanks
Barry