Meh I'll figure out submodules later

.config/nvim/pack/tree/start/plenary.nvim/lua/plenary/profile.lua

@@ -0,0 +1,31 @@
+local profile = {}
+
+-- bundled version of upstream jit.p until LuaJIT is updated to include
+-- https://github.com/LuaJIT/LuaJIT/commit/95140c50010c0557af66dac944403a1a65dd312c
+local p = require'plenary.profile.p'
+
+---start profiling using LuaJIT profiler
+---@param out name and path of log file
+---@param opts table of options
+---            flame (bool, default false) write log in flamegraph format
+--                   (see https://github.com/jonhoo/inferno)
+function profile.start(out, opts)
+    out = out or "profile.log"
+    opts = opts or {}
+    local popts = "10,i1,s,m0"
+    if opts.flame then popts = popts .. ",G" end
+    p.start(popts, out)
+end
+
+---stop profiling
+profile.stop = p.stop
+
+function profile.benchmark(iterations, f, ...)
+  local start_time = vim.loop.hrtime()
+  for _ = 1, iterations do
+    f(...)
+  end
+  return (vim.loop.hrtime() - start_time) / 1E9
+end
+
+return profile