Re: [PATCH v4 2/2] perf report: Implement visual marker for macro fusion in annotate

From: Jin, Yao
Date: Sun Jul 09 2017 - 20:31:35 EST



I applied this one, no unnecessary parsing of cpuid done at each
jump->target arrow rendering, much better, thanks!

One thing for a follow up patch:

We have this when the cursor is at a jump instruction:

â âââtest %ecx,%ecx
-> â âââje 714cf
â â mov LINES+0xb40,%edx
â â test %edx,%edx
â ââ je 71580
â714cf:âââmov LINES+0x10c8,%eax

But if we go up a line, to that "test" instruction, we get:

-> â test %ecx,%ecx
â â je 714cf
â mov LINES+0xb40,%edx
â test %edx,%edx
â â je 71580
â714cf: mov LINES+0x10c8,%eax

I suggest that this be changed to:

-> â ââtest %ecx,%ecx
â â je 714cf
â mov LINES+0xb40,%edx
â test %edx,%edx
â â je 71580
â714cf: mov LINES+0x10c8,%eax

I.e. even before going to the jump instruction line with the cursor, we
would see the fused instructions.

To do that perhaps we should improve annotate_browser__draw_current_jump
to improve that part that looks for is_valid_jump() to consider
instructions that could be fused with jumps for the machine where the
perf data came from, etc.

But the current situation is better already, thanks for your work,
applied!

- Arnaldo

I will investigate how to do the follow-up patch.

Thanks
Jin Yao