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Kan Liang
41013f0c09
There could be different types of memory in the system. E.g normal System Memory, Persistent Memory. To understand how the workload maps to those memories, it's important to know the I/O statistics of them. Perf can collect physical addresses, but those are raw data. It still needs extra work to resolve the physical addresses. Provide a script to facilitate the physical addresses resolving and I/O statistics. Profile with MEM_INST_RETIRED.ALL_LOADS or MEM_UOPS_RETIRED.ALL_LOADS event if any of them is available. Look up the /proc/iomem and resolve the physical address. Provide memory type summary. Here is an example output: # perf script report mem-phys-addr Event: mem_inst_retired.all_loads:P Memory type count percentage ---------------------------------------- ----------- ----------- System RAM 74 53.2% Persistent Memory 55 39.6% N/A --- Changes since V2: - Apply the new license rules. - Add comments for globals Changes since V1: - Do not mix DLA and Load Latency. Do not compare the loads and stores. Only profile the loads. - Use event name to replace the RAW event Signed-off-by: Kan Liang <[email protected]> Reviewed-by: Andi Kleen <[email protected]> Cc: Dan Williams <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Philippe Ombredanne <[email protected]> Cc: Stephane Eranian <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
20 lines
464 B
Bash
20 lines
464 B
Bash
#!/bin/bash
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#
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# Profiling physical memory by all retired load instructions/uops event
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# MEM_INST_RETIRED.ALL_LOADS or MEM_UOPS_RETIRED.ALL_LOADS
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#
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load=`perf list | grep mem_inst_retired.all_loads`
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if [ -z "$load" ]; then
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load=`perf list | grep mem_uops_retired.all_loads`
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fi
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if [ -z "$load" ]; then
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echo "There is no event to count all retired load instructions/uops."
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exit 1
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fi
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arg=$(echo $load | tr -d ' ')
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arg="$arg:P"
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perf record --phys-data -e $arg $@
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