linux-kernel - Re: [RFC PATCH v1] perf tests: Test annotate with data type profiling and rust

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Message-ID: <7d3n23li6drroxrdlpxn7ixehdeszkjdftah3zyngjl2qs22ef@yelcjv53v42o>
Date: Sun, 1 Feb 2026 11:33:54 +0100
From: Dmitry Dolgov <9erthalion6@...il.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: linux-perf-users@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v1] perf tests: Test annotate with data type
 profiling and rust

> On Fri, Jan 30, 2026 at 09:44:47AM +0100, Dmitry Dolgov wrote:
> > I'm not managing to reproduce your results, can you please elaborate
> > some more?
> 
> That's most unexpected for me, the test output I see looks like this:
> 
>          : 54     for _ in 1..count {
>     0.00 :   5423b8: mov    %ecx,0x7c(%rsp)
>     0.00 :   5423bc: mov    %eax,0x80(%rsp)
>     0.00 :   5423c3: lea    0x7c(%rsp),%rdi
>    12.28 :   5423c8: call   541f00 <core::iter::range::<impl core::iter::traits::iterator::Iterator for core::ops::range::Range<A>>::next>
>     0.00 :   5423cd: mov    %eax,0x20(%rsp)
>    10.21 :   5423d1: jmp    5423d3 <test_rs+0xb3>
>     0.00 :   5423d3: mov    0x20(%rsp),%eax
>     0.00 :   5423d7: mov    %eax,%eax
>     0.00 :   5423d9: test   $0x1,%rax
>     0.29 :   5423df: je     5423f6 <test_rs+0xd6>
>          : 65     b.data1 += 1;
>    13.69 :   5423e1: mov    0x48(%rsp),%rax     # data-type: struct Buf +0x18 (data1)
>     0.00 :   5423e6: add    $0x1,%rax
>     0.00 :   5423ea: mov    %rax,0x18(%rsp)     # data-type: u64 +0
>     0.00 :   5423ef: setb   %al
>    11.17 :   5423f2: jb     54243a <test_rs+0x11a>
>     0.00 :   5423f4: jmp    542426 <test_rs+0x106>
>     0.00 :   5423f6: lea    0x30(%rsp),%rdi
>          : 73     }
> 
> Where '# data-type: struct Buf' is as far as I understand a manifestation of
> data type profiling succeeding. But my environment has slightly different
> version of rust -- I need to figure out what's going on here, thanks.

I've being testing this in the same way, but without any rust code --
just on a simple datasym workload. Surprisingly, it seems that
'data-type: buf' marks are disappearing even in this case starting from:

c31040085914f1188720073baa43d1483693c0a3 (perf dwarf-regs: Clean up x86
dwarf_regnum code)

I'm not sure yet why this is happening, but don't see anything in the
commit mentioning that -- since there are no code-with-type tests yet,
maybe an unexpected side effect?