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@@ -30,12 +30,25 @@ class MemoryStats
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   end
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   def start
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+		some_private_dirty_rss_cannot_be_determined = false
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     processes = list_processes(:exe => PlatformInfo::HTTPD)
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+		some_private_dirty_rss_cannot_be_determined = processes.any? do |p|
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+			p.private_dirty_rss.nil?
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+		end
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     print_process_list_stats(processes)
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     puts
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     processes = list_processes(:match => /^(Passenger|Rails) /)
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+		some_private_dirty_rss_cannot_be_determined ||= processes.any? do |p|
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+			p.private_dirty_rss.nil?
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+		end
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     print_process_list_stats(processes)
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+
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+		if ::Process.uid != 0 && some_private_dirty_rss_cannot_be_determined
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+			puts
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+			puts "*** WARNING: Please run this tool as root, otherwise it " <<
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+				"can't determine the private dirty RSS of processes."
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+		end
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   end
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   # Returns a list of Process objects that match the given search criteria.