linux-kernel - Re: [PATCH 2/5] perf/sdt/x86: Add renaming logic for rNN and other registers

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Date:   Tue, 7 Feb 2017 12:11:59 +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,
        mpe@...erman.id.au, naveen.n.rao@...ux.vnet.ibm.com,
        mhiramat@...nel.org, maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH 2/5] perf/sdt/x86: Add renaming logic for rNN and other
 registers

On Thu,  2 Feb 2017 16:41:40 +0530
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> 'perf probe' is failing for sdt markers whose arguments has rNN
> (with postfix b/w/d), %rsp, %esp, %sil etc. registers. Add renaming
> logic for these registers.
> 

Looks good to me.

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 | 44 ++++++++++++++++++++++++++----------
>  1 file changed, 32 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/perf/arch/x86/util/perf_regs.c b/tools/perf/arch/x86/util/perf_regs.c
> index 09a7f55..d8a8dcf 100644
> --- a/tools/perf/arch/x86/util/perf_regs.c
> +++ b/tools/perf/arch/x86/util/perf_regs.c
> @@ -48,10 +48,42 @@ static const struct sdt_name_reg sdt_reg_renamings[] = {
>  	SDT_NAME_REG(rdx, dx),
>  	SDT_NAME_REG(esi, si),
>  	SDT_NAME_REG(rsi, si),
> +	SDT_NAME_REG(sil, si),
>  	SDT_NAME_REG(edi, di),
>  	SDT_NAME_REG(rdi, di),
> +	SDT_NAME_REG(dil, di),
>  	SDT_NAME_REG(ebp, bp),
>  	SDT_NAME_REG(rbp, bp),
> +	SDT_NAME_REG(bpl, bp),
> +	SDT_NAME_REG(rsp, sp),
> +	SDT_NAME_REG(esp, sp),
> +	SDT_NAME_REG(spl, sp),
> +
> +	/* rNN registers */
> +	SDT_NAME_REG(r8b,  r8),
> +	SDT_NAME_REG(r8w,  r8),
> +	SDT_NAME_REG(r8d,  r8),
> +	SDT_NAME_REG(r9b,  r9),
> +	SDT_NAME_REG(r9w,  r9),
> +	SDT_NAME_REG(r9d,  r9),
> +	SDT_NAME_REG(r10b, r10),
> +	SDT_NAME_REG(r10w, r10),
> +	SDT_NAME_REG(r10d, r10),
> +	SDT_NAME_REG(r11b, r11),
> +	SDT_NAME_REG(r11w, r11),
> +	SDT_NAME_REG(r11d, r11),
> +	SDT_NAME_REG(r12b, r12),
> +	SDT_NAME_REG(r12w, r12),
> +	SDT_NAME_REG(r12d, r12),
> +	SDT_NAME_REG(r13b, r13),
> +	SDT_NAME_REG(r13w, r13),
> +	SDT_NAME_REG(r13d, r13),
> +	SDT_NAME_REG(r14b, r14),
> +	SDT_NAME_REG(r14w, r14),
> +	SDT_NAME_REG(r14d, r14),
> +	SDT_NAME_REG(r15b, r15),
> +	SDT_NAME_REG(r15w, r15),
> +	SDT_NAME_REG(r15d, r15),
>  	SDT_NAME_REG_END,
>  };
>  
> @@ -88,18 +120,6 @@ int sdt_rename_register(char **pdesc, char *old_name)
>  
>  	/* Copy the chars after the register name (if need be) */
>  	offset = prefix_len + sdt_len;
> -	if (offset < old_desc_len) {
> -		/*
> -		 * The orginal register name can be suffixed by 'b',
> -		 * 'w' or 'd' to indicate its size; so, we need to
> -		 * skip this char if we met one.
> -		 */
> -		char sfx = old_desc[offset];
> -
> -		if (sfx == 'b' || sfx == 'w'  || sfx == 'd')
> -			offset++;
> -	}
> -
>  	if (offset < old_desc_len)
>  		memcpy(new_desc + prefix_len + uprobe_len,
>  			old_desc + offset, old_desc_len - offset);
> -- 
> 2.9.3
> 


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