module:set_global();

local measure = require"core.statsmanager".measure;

local have_pposix, pposix = pcall(require, "util.pposix");

local measures = {};

setmetatable(measures, {

	__index = function (t, k)

		local m = measure("sizes", "memory."..k); t[k] = m; return m;

	end

});

module:hook("stats-update", function ()

	measures.lua(collectgarbage("count")*1024);

end);

if have_pposix and pposix.meminfo then

	module:hook_global("stats-update", function ()

		local m = measures;

		for k, v in pairs(pposix.meminfo()) do

			m[k](v);

		end

	end);

end

if require"lfs".attributes("/proc/self/statm", "mode") == "file" then

	local pagesize = module:get_option_number("memory_pagesize", 4096); -- getconf PAGESIZE

	module:hook("stats-update", function ()

		local statm, err = io.open("/proc/self/statm");

		if not statm then

			module:log("error", tostring(err));

			return;

		end

		-- virtual memory (caches, opened librarys, everything)

		measures.total(statm:read("*n") * pagesize);

		-- resident set size (actually used memory)

		measures.rss(statm:read("*n") * pagesize);

		statm:close();

	end);

end