linux-kernel - Re: [PATCH v8 3/5] perf mem: Print snoop peer flag

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Message-ID: <5cb1514a-3f68-d790-4f1f-0856de73b814@linux.ibm.com>
Date:   Wed, 11 May 2022 11:15:08 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     Ali Saidi <alisaidi@...zon.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, german.gomez@....com,
        leo.yan@...aro.org, acme@...nel.org
Cc:     benh@...nel.crashing.org, Nick.Forrington@....com,
        alexander.shishkin@...ux.intel.com, andrew.kilroy@....com,
        james.clark@....com, john.garry@...wei.com, jolsa@...nel.org,
        lihuafei1@...wei.com, mark.rutland@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v8 3/5] perf mem: Print snoop peer flag



On 5/5/22 00:18, Ali Saidi wrote:
> From: Leo Yan <leo.yan@...aro.org>
> 
> Since PERF_MEM_SNOOPX_PEER flag is a new snoop type, print this flag if
> it is set.
> 
> Before:
>        memstress  3603 [020]   122.463754:          1            l1d-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          l1d-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1            llc-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          llc-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          tlb-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1              memory:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
> 
> After:
> 
>        memstress  3603 [020]   122.463754:          1            l1d-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          l1d-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1            llc-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          llc-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1          tlb-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
>        memstress  3603 [020]   122.463754:          1              memory:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> Reviewed-by: Ali Saidi <alisaidi@...zon.com>
> Tested-by: Ali Saidi <alisaidi@...zon.com>

Patch looks good to me.

Reviewed-By: Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain

> ---
>  tools/perf/util/mem-events.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index efaf263464b9..db5225caaabe 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -410,6 +410,11 @@ static const char * const snoop_access[] = {
>  	"HitM",
>  };
>  
> +static const char * const snoopx_access[] = {
> +	"Fwd",
> +	"Peer",
> +};
> +
>  int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
>  {
>  	size_t i, l = 0;
> @@ -430,13 +435,20 @@ int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
>  		}
>  		l += scnprintf(out + l, sz - l, snoop_access[i]);
>  	}
> -	if (mem_info &&
> -	     (mem_info->data_src.mem_snoopx & PERF_MEM_SNOOPX_FWD)) {
> +
> +	m = 0;
> +	if (mem_info)
> +		m = mem_info->data_src.mem_snoopx;
> +
> +	for (i = 0; m && i < ARRAY_SIZE(snoopx_access); i++, m >>= 1) {
> +		if (!(m & 0x1))
> +			continue;
> +
>  		if (l) {
>  			strcat(out, " or ");
>  			l += 4;
>  		}
> -		l += scnprintf(out + l, sz - l, "Fwd");
> +		l += scnprintf(out + l, sz - l, snoopx_access[i]);
>  	}
>  
>  	if (*out == '\0')