[WIP] Raw events

[vchuravy]

No description provided.

[YingboMa]

BTW, I think you can find all the special encoding here http://sbexr.rabexc.org/latest/sources/ea/031fea6da3334a.html

[vchuravy]

Yeah we should parse these automatically.

[vchuravy]

As yinhbo pointed out we probably want to parse the events instead of manually encoding them.

[carstenbauer]

No promises, but I might be able to give the parsing a try later this week. I have a question though:

In, say, (:mem_inst_retired_all_stores, 0x82d0) how to I get the second UInt16 from the source https://github.com/gregkh/linux/blob/master/tools/perf/pmu-events/arch/x86/skylake/cache.json#L425? I seems to be just

julia> eventcode
0xd0

julia> umask
0x82

julia> (UInt16(umask) << 8) + UInt16(eventcode)
0x82d0

Correct? Is there a better way do to it?

[carstenbauer]

First attempt:

combine_code_umask(eventcode::UInt8, umask::UInt8) = (UInt16(umask) << 8) + eventcode

function get_skylake_raw_events()
  base_url = "https://raw.githubusercontent.com/gregkh/linux/master/tools/perf/pmu-events/arch/x86/skylake/"
  json_files = ("cache.json",
                "floating-point.json",
                "frontend.json",
                "memory.json",
                "other.json",
                "pipeline.json",
                #"skl-metrics.json",
                "uncore.json",
                "virtual-memory.json")
  events = Tuple{Symbol, UInt16}[]
  for jf in json_files
    url = joinpath(base_url, jf)
    json = JSON.parsefile(download(url))
    for entry in json
      try
        # TODO: some entries in pipeline.json don't have EventCodes
        haskey(entry, "EventCode") || continue
        if !contains(entry["EventCode"], ",")
          eventcode = parse(UInt8, entry["EventCode"])
        else
          # TODO: What to do if we have multiple EventCodes, i.e. "0xB7, 0xBB" in cache.json
          eventcode = parse(UInt8, first(split(entry["EventCode"], ",")))
        end
        # TODO: some entries in pipeline.json don't have UMasks
        haskey(entry, "UMask") || continue
        umask = parse(UInt8, entry["UMask"])

        eventname = Symbol(lowercase(replace(entry["EventName"], "."=>"_")))
        eventtuple = (eventname, combine_code_umask(eventcode, umask))
        push!(events, eventtuple)
      catch e
        @warn "$(entry["EventName"]) in $jf couldn't be parsed: $e"
      end
    end
  end
  return events
end

Gives:

julia> LinuxPerf.get_skylake_raw_events()
558-element Vector{Tuple{Symbol, UInt16}}:
 (:offcore_response_demand_rfo_l4_hit_local_l4_snoop_hit_no_fwd, 0x01b7)
 (:offcore_response_other_l3_hit_s_snoop_hit_no_fwd, 0x01b7)
 (:offcore_response_demand_rfo_l3_hit_m_snoop_not_needed, 0x01b7)
 (:offcore_response_demand_data_rd_l3_hit_e_any_snoop, 0x01b7)
 (:offcore_requests_demand_rfo, 0x04b0)
 (:offcore_response_demand_code_rd_any_response, 0x01b7)
 (:offcore_response_demand_rfo_supplier_none_snoop_not_needed, 0x01b7)
 (:l2_rqsts_pf_miss, 0x3824)
 (:offcore_response_demand_code_rd_l3_hit_any_snoop, 0x01b7)
 (:offcore_response_demand_data_rd_l3_hit_m_snoop_not_needed, 0x01b7)
 (:offcore_response_demand_data_rd_l3_hit_s_spl_hit, 0x01b7)
 (:l2_rqsts_all_demand_miss, 0x2724)
 ⋮
 (:dtlb_load_misses_walk_completed_4k, 0x0208)
 (:itlb_misses_stlb_hit, 0x2085)
 (:dtlb_load_misses_walk_completed_2m_4m, 0x0408)
 (:dtlb_load_misses_miss_causes_a_walk, 0x0108)
 (:ept_walk_pending, 0x104f)
 (:tlb_flush_stlb_any, 0x20bd)
 (:dtlb_load_misses_walk_completed_1g, 0x0808)
 (:dtlb_load_misses_walk_active, 0x1008)
 (:itlb_misses_walk_completed_2m_4m, 0x0485)
 (:dtlb_store_misses_walk_completed, 0x0e49)
 (:dtlb_store_misses_walk_completed_1g, 0x0849)

Any suggestions how to handle the TODO's?

Note that I can't find some of the events you hardcoded @vchuravy:

julia> for v in x
           if isnothing(findfirst(e->e[2] == v[2], events))
               @show v
           end
       end
v = (:fp_arith_inst_retired_scalar, 0x03c7)
v = (:fp_arith_inst_retired_double, 0x15c7)
v = (:fp_arith_inst_retired_single, 0x2ac7)
v = (:fp_arith_inst_retired_packed, 0x3cc7)
v = (:fp_arith_inst_retired_512B_packed_double, 0x40c7)
v = (:L2_trans_L1D_wb, 0x10f0)
v = (:L2_lines_in_all, 0x70f1)
v = (:cas_count_rd, 0x0304)
v = (:cas_count_wr, 0x0c04)

[vchuravy]

They should be in here: https://github.com/gregkh/linux/blob/a5e13c6df0e41702d2b2c77c8ad41677ebb065b3/tools/perf/pmu-events/arch/x86/skylake/floating-point.json#L11-L19

maybe you have them under a different name?

Also the "official" Intel files live here: https://download.01.org/perfmon/SKL/