linux-kernel - Re: [PATCH 11/11] perf mem: Add 'dtlb' output field

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Message-ID: <aBTzK_vZ0kBh9CLV@x1>
Date: Fri, 2 May 2025 13:30:35 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Ravi Bangoria <ravi.bangoria@....com>, Leo Yan <leo.yan@....com>
Subject: Re: [PATCH 11/11] perf mem: Add 'dtlb' output field

On Wed, Apr 30, 2025 at 01:55:48PM -0700, Namhyung Kim wrote:
> This is a breakdown of perf_mem_data_src.mem_dtlb values.  It assumes
> PMU drivers would set PERF_MEM_TLB_HIT bit with an appropriate level.
> And having PERF_MEM_TLB_MISS means that it failed to find one in any
> levels of TLB.  For now, it doesn't use PERF_MEM_TLB_{WK,OS} bits.
> 
> Also it seems Intel machines don't distinguish L1 or L2 precisely.  So I
> added ANY_HIT (printed as "L?-Hit") to handle the case.
> 
>   $ perf mem report -F overhead,dtlb,dso --stdio
>   ...
>   #           --- D-TLB ----
>   # Overhead   L?-Hit   Miss  Shared Object
>   # ........  ..............  .................
>   #
>       67.03%    99.5%   0.5%  [unknown]
>       31.23%    99.2%   0.8%  [kernel.kallsyms]
>        1.08%    97.8%   2.2%  [i915]
>        0.36%   100.0%   0.0%  [JIT] tid 6853
>        0.12%   100.0%   0.0%  [drm]
>        0.05%   100.0%   0.0%  [drm_kms_helper]
>        0.05%   100.0%   0.0%  [ext4]
>        0.02%   100.0%   0.0%  [aesni_intel]
>        0.02%   100.0%   0.0%  [crc32c_intel]
>        0.02%   100.0%   0.0%  [dm_crypt]
>        ...

root@...ber:~# perf report --header | grep cpudesc
# cpudesc : AMD Ryzen 9 9950X3D 16-Core Processor
root@...ber:~# perf mem report -F overhead,dtlb,dso --stdio | head -20
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 2K of event 'cycles:P'
# Total weight : 2637
# Sort order   : local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked,blocked,local_ins_lat,local_p_stage_cyc
#
#           ---------- D-TLB -----------                                   
# Overhead   L1-Hit L2-Hit   Miss  Other  Shared Object                    
# ........  ............................  .................................
#
    77.47%    18.4%   0.1%   0.6%  80.9%  [kernel.kallsyms]                
     5.61%    36.5%   0.7%   1.4%  61.5%  libxul.so                        
     2.77%    39.7%   0.0%  12.3%  47.9%  libc.so.6                        
     2.01%    34.0%   1.9%   1.9%  62.3%  libglib-2.0.so.0.8400.1          
     1.93%    31.4%   2.0%   2.0%  64.7%  [amdgpu]                         
     1.63%    48.8%   0.0%   0.0%  51.2%  [JIT] tid 60168                  
     1.14%     3.3%   0.0%   0.0%  96.7%  [vdso]                           
root@...ber:~#