add BenchmarkTools integration

lib/ValgrindBenchmarkTools/Project.toml

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+name = "ValgrindBenchmarkTools"
+uuid = "cddf0403-163e-426d-bfc7-5afd20e79fa3"
+authors = ["Valentin Churavy <[email protected]>"]
+version = "0.1.0"
+
+[deps]
+BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
+Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
+Valgrind = "a52a33a2-b08a-4c46-b084-8041b090a67d"

lib/ValgrindBenchmarkTools/examples/callgrind.jl

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+using BenchmarkTools
+using ValgrindBenchmarkTools
+
+@noinline function g(a)
+    c = 0
+    for x in a
+        if x > 0
+            c += 1
+        end
+    end
+    c
+end
+const data = zeros(10000)
+
+@show @benchmark g($data)

lib/ValgrindBenchmarkTools/src/ValgrindBenchmarkTools.jl

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+module ValgrindBenchmarkTools
+
+using Valgrind, Reexport
+@reexport using BenchmarkTools
+
+@inline function prehook()
+    Valgrind.Callgrind.zero_stats()
+    Valgrind.Callgrind.start_instrumentation()
+end
+
+@inline function posthook(id)
+    Valgrind.Callgrind.stop_instrumentation()
+    Valgrind.Callgrind.dump_stats_at(id)
+end
+
+function __init__()
+    BenchmarkTools.DEFAULT_PARAMETERS = BenchmarkTools.Parameters(;
+        prehook = prehook,
+        posthook = posthook,
+        enable_customizable_func = :ALL,
+    )
+
+    # Serialization
+    BenchmarkTools.VERSIONS["Valgrind"] = pkgversion(Valgrind)
+    BenchmarkTools.VERSIONS["ValgrindBenchmarkTools.jl"] =
+        pkgversion(ValgrindBenchmarkTools)
+end
+
+
+end # module ValgrindBenchmarkTools