linux-kernel - Re: [PATCH v2 1/3] perf/sdt/x86: Add renaming logic for (missing) 8 bit registers

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Date:   Mon, 27 Mar 2017 23:17:15 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     acme@...hat.com, alexis.berlemont@...il.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        naveen.n.rao@...ux.vnet.ibm.com, mpe@...erman.id.au,
        hemant@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 1/3] perf/sdt/x86: Add renaming logic for (missing) 8
 bit registers

On Mon, 27 Mar 2017 13:28:27 +0530
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> I found couple of events using al, bl, cl and dl registers for
> argument. These are not directly accepted by uprobe_events and
> thus needs to be mapped to ax, bx, cx and dx respectively.
> 
> Few ex,
> 
>   /usr/bin/qemu-system-s390x
>     css_adapter_interrupt: 1@%bl
>     css_chpid_add: 1@%cl 1@...l 1@%dl
>     dma_bdrv_io: 8@...x 8@...p -8@...4 1@%al
> 
>   /usr/bin/postgres
>     buffer__read__done: ... -1@...sh -1@%al
>     buffer__read__start: ... -1@%al

Of course, it should be suppoted. BTW, wouldn't we take care about ah, bh ... too?

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thanks!

> 
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> ---
>  tools/perf/arch/x86/util/perf_regs.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
> index d8a8dcf..99faab4 100644
> --- a/tools/perf/arch/x86/util/perf_regs.c
> +++ b/tools/perf/arch/x86/util/perf_regs.c
> @@ -40,12 +40,16 @@ struct sdt_name_reg {
>  static const struct sdt_name_reg sdt_reg_renamings[] = {
>  	SDT_NAME_REG(eax, ax),
>  	SDT_NAME_REG(rax, ax),
> +	SDT_NAME_REG(al, ax),
>  	SDT_NAME_REG(ebx, bx),
>  	SDT_NAME_REG(rbx, bx),
> +	SDT_NAME_REG(bl, ax),
>  	SDT_NAME_REG(ecx, cx),
>  	SDT_NAME_REG(rcx, cx),
> +	SDT_NAME_REG(cl, ax),
>  	SDT_NAME_REG(edx, dx),
>  	SDT_NAME_REG(rdx, dx),
> +	SDT_NAME_REG(dl, ax),
>  	SDT_NAME_REG(esi, si),
>  	SDT_NAME_REG(rsi, si),
>  	SDT_NAME_REG(sil, si),
> -- 
> 2.9.3
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>