diff --git a/Linux_kernel_diagram.dot b/Linux_kernel_diagram.dot
index a3c252c..df64dc4 100644
--- a/Linux_kernel_diagram.dot
+++ b/Linux_kernel_diagram.dot
@@ -1,379 +1,433 @@
-digraph matrix {
-	graph [newrank=true,
-		nodesep=0.3,
-		ranksep=0.2,
-		overlap=true,
-		splines=false,
-	];
-	node [fixedsize=false,
-		fontname=Ubuntu
-		fontsize=24,
-		height=1,
-		shape=box,
-		style="filled,setlinewidth(5)",
-		width=2.2
-	];
-	edge [arrowhead=none,
-		arrowsize=0.5,
-		labelfontname="Ubuntu",
-		weight=10,
-		style="filled,setlinewidth(5)"
-	];
+digraph "Linux_kernel_diagram" {
+	graph [
+
+		newrank = true,
+		nodesep = 0.3,
+		ranksep = 0.2,
+		overlap = true,
+		splines = false,
+	]
+	node [
+		fixedsize = false,
+		fontname = Ubuntu
+		fontsize = 24,
+		height = 1,
+		shape = box,
+		style = "filled,setlinewidth(5)",
+		width = 2.2
+	]
+	edge [
+
+		arrowhead = none,
+		arrowsize = 0.5,
+		labelfontname = "Ubuntu",
+		weight = 10,
+		style = "filled,setlinewidth(5)"
+	]
 	subgraph system {
-		node [color="#e27dd6ff"];
-		system_		 [color="#e27dd6ff",
-			fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			shape=point
-			];
-		system		 [color="#e27dd6ff",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/System",
-			fillcolor=white,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			width=2];
-		system -> system_		 [arrowhead="",
-			color="#e27dd6ff",
-			row=func]
-		SCI		 [color="#e27dd6ff",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Syscalls",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label="System calls",
-			row=usr,
-			shape=ellipse];
-		sysfs		 [color="#e27dd6ff",
-			fillcolor="#b2d3e4",
-			label="proc & sysfs\nfile systems"];
-		SCI -> sysfs		 [color="#e27dd6ff"];
-		DM		 [color="#e27dd6ff",
-			fillcolor="#91b5c9",
-			fixedsize=true,
-			fontsize=20,
-			height=0.8,
-			label="Device\nModel",
-			shape=octagon,
-			width=2];
-		sysfs -> DM		 [color="#e27dd6ff"];
-		log_sys		 [color="#e27dd6ff",
-			fillcolor="#6a9ab1",
-			fontsize=20,
-			label="system run,\nmodules,\ngeneric\nHW access "];
-		DM -> log_sys		 [color="#e27dd6ff"];
-		bus_drv		 [color="#e27dd6ff",
-			fillcolor="#71809b",
-			label="bus drivers"];
-		log_sys -> bus_drv		 [color="#e27dd6ff"];
-		buses		 [color="#e27dd6ff",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=20,
-			label="buses:\nPCI, USB ...",
-			row=chip];
-		bus_drv -> buses		 [color="#e27dd6ff"];
+		node [color = "#e27dd6ff"]
+		edge [color = "#e27dd6ff"]
+		system_ [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			shape = point
+		]
+		system [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/System",
+			fillcolor = white,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			width = 2]
+		system -> system_ [
+			arrowhead = "",
+			row = func]
+				SCI [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Syscalls",
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = "System calls",
+			row = usr,
+			shape = ellipse]
+		sysfs [
+			fillcolor = "#b2d3e4",
+			label = "proc & sysfs\nfile systems"]
+		SCI -> sysfs
+		DM [
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			fontsize = 20,
+			height = 0.8,
+			label = "Device\nModel",
+			shape = octagon,
+			width = 2]
+		sysfs -> DM
+		log_sys [
+			fillcolor = "#6a9ab1",
+			fontsize = 20,
+			label = "system run,\nmodules,\ngeneric\nHW access "]
+		DM -> log_sys
+		bus_drv [
+			fillcolor = "#71809b",
+			label = "bus drivers"]
+		log_sys -> bus_drv
+		buses [
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 20,
+			label = "buses:\nPCI, USB ...",
+			row = chip]
+		bus_drv -> buses
 	}
 	subgraph networking {
-		node [color="#61c2c5"];
-		edge [color="#61c2c5"];
-		networking_		 [color="#61c2c5",
-			fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			shape=point
-			width=0];
-		networking		 [color="#61c2c5",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Networking",
-			fillcolor=white,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			width=2];
-		networking -> networking_		 [arrowhead="",
-			color="#61c2c5",
-			row=func];
-		sock		 [color="#61c2c5",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label=Sockets,
-			row=usr,
-			shape=ellipse];
-		prot_fam		 [color="#61c2c5",
-			fillcolor="#b2d3e4",
-			label="protocol\nfamilies"];
-		sock -> prot_fam		 [color="#61c2c5"];
-		log_prot		 [color="#61c2c5",
-			fillcolor="#6a9ab1",
-			label="protocols:\nTCP, UDP, IP"];
-		prot_fam -> log_prot		 [color="#61c2c5"];
-		netif		 [color="#61c2c5",
-			fillcolor="#71809b",
-			fontsize=20,
-			label="network\ninterfaces\nand drivers"];
-		log_prot -> netif		 [color="#61c2c5"];
-		net_hw		 [color="#61c2c5",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=20,
-			label="network:\nEthernet, WiFi ...",
-			row=chip];
-		netif -> net_hw		 [color="#61c2c5"];
-		NFS		 [color="#8383cc",
-			fillcolor="#91b5c9",
-			fixedsize=true,
-			height=0.8,
-			label=NFS,
-			shape=octagon,
-			width=1.2];
-		NFS -> log_prot		 [color="#61c2c5",
-			weight=0];
+		node [ color = "#61c2c5"]
+		edge [ color = "#61c2c5"]
+		networking_ [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			shape = point
+				width = 0]
+		networking [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Networking",
+			fillcolor = white,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			width = 2]
+		networking -> networking_ [
+			arrowhead = "",
+			row = func]
+		sock [
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = Sockets,
+			row = usr,
+			shape = ellipse]
+		prot_fam [
+			fillcolor = "#b2d3e4",
+			label = "protocol\nfamilies"]
+		sock -> prot_fam
+		log_prot [
+			fillcolor = "#6a9ab1",
+			label = "protocols:\nTCP, UDP, IP"]
+		prot_fam -> log_prot
+		netif [
+			fillcolor = "#71809b",
+			fontsize = 20,
+			label = "network\ninterfaces\nand drivers"]
+		log_prot -> netif
+		net_hw [
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 20,
+			label = "network:\nEthernet, WiFi ...",
+			row = chip]
+		netif -> net_hw
+		NFS [
+			color = "#8383cc",
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			height = 0.8,
+			label = NFS,
+			shape = octagon,
+			width = 1.2]
+		NFS -> log_prot [ weight = 0]
 	}
-	subgraph storage {
-		node [color="#8383cc"];
-		edge [color="#8383cc"];
-		NFS;
-		storage_		 [color="#8383cc",
-			shape=point
-			fixedsize=true,
-			height=0,
-			style=invis,
-			width=0];
-		storage		 [color="#8383cc",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Storage",
-			fillcolor=white,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			width=2];
-		storage -> storage_		 [arrowhead="",
-			color="#8383cc",
-			row=func];
-		FS		 [color="#8383cc",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label="files and\ndirectories",
-			row=usr,
-			shape=ellipse];
-		VFS		 [color="#8383cc",
-			fillcolor="#b2d3e4",
-			label="Virtual\nFile System"];
-		FS -> VFS		 [color="#8383cc"];
-		VFS -> NFS		 [color="#8383cc",
-			weight=0];
-		logFS		 [color="#8383cc",
-			fillcolor="#6a9ab1",
-			fontsize=20,
-			label="logical\nfilesystems:\next3, xfs ..."];
-		VFS -> logFS		 [color="#8383cc"];
-		PC		 [color="#51bf5b",
-			fillcolor="#91b5c9",
-			fixedsize=true,
-			fontsize=20,
-			height=0.8,
-			label="page\ncache",
-			shape=octagon,
-			width=1.2];
-		PC -> PA		 [color="#51bf5b", weight=0];
-		VFS -> PC		 [color="#8383cc", weight=0];
-		mmap		 [color="#51bf5b",
-			fillcolor="#91b5c9",
-			fixedsize=true,
-			fontsize=20,
-			height=0.8,
-			label="memory\nmapping",
-			shape=octagon,
-			width=2];
-		VFS -> mmap		 [color="#8383cc",
-			weight=0];
-		block		 [color="#8383cc",
-			fillcolor="#71809b",
-			fontsize=20,
-			label="Block\ndevices\nand drivers"];
-		logFS -> block		 [color="#8383cc"];
-		SD		 [color="#8383cc",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=20,
-			label="storage devices:\nSCSI, NVMe ...",
-			row=chip];
-		block -> SD		 [color="#8383cc"];
-	}	// storge
 	subgraph processing {
-		node [color="#c46747"];
-		edge [color="#c46747"];
-		processing_		 [color="#c46747",
-			fixedsize=true,
-			height=0,
-			shape=point
-			style=invis,
-			width=0];
-		processing		 [color="#c46747",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Processing",
-			fillcolor=white,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			width=2];
-		processing -> processing_		 [arrowhead="",
-			color="#c46747",
-			row=func];
-		proc		 [color="#c46747",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label=Processes,
-			row=usr,
-			shape=ellipse];
-		Tasks		 [color="#c46747",
-			fillcolor="#b2d3e4"];
-		proc -> Tasks		 [color="#c46747"];
-		sync		 [color="#c46747",
-			fillcolor="#91b5c9",
-			fixedsize=true,
-			fontsize=20,
-			fontname="Ubuntu Condensed"
-			label=synchronization,
-			height=0.7,
-			//width=2,
-			shape=octagon];
-		Tasks -> sync		 [color="#c46747"];
-		sched		 [color="#c46747",
-			fillcolor="#6a9ab1",
-			label=Scheduler];
-		sync -> sched		 [color="#c46747"];
-		IRQ		 [color="#c46747",
-			fillcolor="#71809b",
-			fontsize=20,
-			label="interrupts\ncore,\nCPU arch"];
-		sched -> IRQ		 [color="#c46747"];
-		CPU		 [color="#c46747",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=20,
-			row=chip];
-		IRQ -> CPU		 [color="#c46747"];
+		node [ color = "#c46747"]
+		edge [ color = "#c46747"]
+		processing_ [
+			fixedsize = true,
+			height = 0,
+			shape = point
+				style = invis,
+			width = 0]
+		processing [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Processing",
+			fillcolor = white,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			width = 2]
+		processing -> processing_ [
+			arrowhead = "",
+			row = func]
+		proc [
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = Processes,
+			row = usr,
+			shape = ellipse]
+		Tasks [
+			fillcolor = "#b2d3e4"]
+		proc -> Tasks
+		sync [
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			fontsize = 20,
+			fontname = "Ubuntu Condensed"
+				label = synchronization,
+			height = 0.7,
+			//width = 2,
+			shape = octagon]
+		Tasks -> sync
+		sched [
+			fillcolor = "#6a9ab1",
+			label = Scheduler]
+		sync -> sched
+		IRQ [
+			fillcolor = "#71809b",
+			fontsize = 20,
+			label = "interrupts\ncore,\nCPU arch"]
+		sched -> IRQ
+		CPU [
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 20,
+			row = chip]
+		IRQ -> CPU
 	}	// processing
+	subgraph mem {
+		node [
+			color = "#51bf5b",
+			height = 0.5
+		]
+		edge [ color = "#51bf5b"]
+		MA [
+			color = "#51bf5b",
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = "memory\naccess",
+			row = usr,
+			height = 1,
+			shape = ellipse]
+		MA -> VM
+		mmap [
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			fontsize = 20,
+			height = 0.8,
+			label = "memory\nmapping",
+			shape = octagon,
+			width = 2]
+		mmap -> log_mem
+		log_mem -> PA
+		//VFS -> SW [ style = invis]
+		SW [
+			color = "#8383cc",
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			label = Swap,
+			height = 0.8,
+			shape = octagon,
+			width = 1.2]
+		mmap -> SW [ weight = 1]
+		SW -> block [
+			color = "#8383cc", weight = 1]
+		PA [
+			fillcolor = "#71809b",
+			label = "Page\nAllocator"
+		]
+		PC -> PA [weight = 0 color="#51bf5b"]
+		RAM [
+			color = "#51bf5b",
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 20,
+			label = "MMU, RAM",
+			height = 1,
+			row = chip]
+		PA -> RAM
+		memory -> memory_ [
+			arrowhead = "",
+			row = func]
+		VM -> mmap
+	}	// mem
+	subgraph storage {
+		node [ color = "#8383cc"]
+		edge [ color = "#8383cc"]
+		NFS;
+		storage_ [
+			shape = point,
+			fixedsize = true,
+			height = 0,
+			style = invis,
+			width = 0]
+		storage [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Storage",
+			fillcolor = white,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			width = 2]
+		storage -> storage_ [
+			arrowhead = "",
+			row = func]
+		FS [
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = "files and\ndirectories",
+			row = usr,
+			shape = ellipse]
+		VFS [
+			fillcolor = "#b2d3e4",
+			label = "Virtual\nFile System"]
+		FS -> VFS
+		VFS -> mmap [ weight = 0]
+		VFS -> NFS [
+			weight = 0]
+		logFS [
+			fillcolor = "#6a9ab1",
+			fontsize = 20,
+			label = "logical\nfilesystems:\next3, xfs ..."]
+		VFS -> logFS
+		PC [
+			fillcolor = "#91b5c9",
+			fixedsize = true,
+			fontsize = 20,
+			height = 0.8,
+			label = "page\ncache",
+			shape = octagon,
+			width = 1.2]
+		VFS -> PC [ weight = 0]
+		block [
+			fillcolor = "#71809b",
+			fontsize = 20,
+			label = "Block\ndevices\nand drivers"]
+		logFS -> block
+		SD [
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 20,
+			label = "storage devices:\nSCSI, NVMe ...",
+			row = chip]
+		block -> SD
+	}	// storge
 	subgraph HI {
-		node [color="#cfbf57ff",
-
-		];
-		edge [color="#cfbf57ff",
-			weight=10
-		];
-		HI_		 [color="#cfbf57ff",
-			fixedsize=true,
-			height=0,
-			shape=point
-			style=invis,
-			width=0];
-		HI		 [color="#cfbf57ff",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Human_interfaces",
-			fillcolor=white,
-			fixedsize=true,
-			fontsize=12,
-			height=0.6,
-			label="human\ninterface",
-			row=func,
-			width=2];
-		HI -> HI_		 [arrowhead="",
-			color="#cfbf57ff",
-			row=func];
-		char		 [color="#cfbf57ff",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label="char\ndevices",
-			row=usr,
-			shape=ellipse];
-		input		 [color="#cfbf57ff",
-			fillcolor="#b2d3e4",
-			label="input\nsubsystem"];
-		char -> input		 [color="#cfbf57ff"];
-		F7		 [color="#cfbf57ff",
-			fillcolor="#6a9ab1",
-			label="HI class\ndrivers"];
-		input -> F7		 [color="#cfbf57ff"];
-		HID		 [color="#cfbf57ff",
-			fillcolor="#71809b",
-			fontsize=20,
-			URL="https://www.kernel.org/doc/html/latest/hid/",
-			label="HI\nperipherals\ndrivers"];
-		F7 -> HID		 [color="#cfbf57ff"
-			];
-		display		 [color="#cfbf57ff",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=19,
-			label="keyboard, mouse,\ndisplay, audio",
-			row=chip];
-		HID -> display		 [color="#cfbf57ff" ];
+		node [color = "#cfbf57ff"]
+		edge [
+			color = "#cfbf57ff",
+			weight = 10
+		]
+		HI_ [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
+		HI [
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Human_interfaces",
+			fillcolor = white,
+			fixedsize = true,
+			fontsize = 12,
+			height = 0.6,
+			label = "human\ninterface",
+			row = func,
+			width = 2]
+		HI -> HI_ [
+			arrowhead = "",
+			row = func]
+		char [
+			fillcolor = "#d9e7ee",
+			fixedsize = true,
+			label = "char\ndevices",
+			row = usr,
+			shape = ellipse]
+		input [
+			fillcolor = "#b2d3e4",
+			label = "input\nsubsystem"]
+		char -> input
+		F7 [
+			fillcolor = "#6a9ab1",
+			label = "HI class\ndrivers"]
+		input -> F7
+		HID [
+			fillcolor = "#71809b",
+			fontsize = 20,
+			URL = "https://www.kernel.org/doc/html/latest/hid/",
+			label = "HI\nperipherals\ndrivers"]
+		F7 -> HID
+		display [
+			fillcolor = "#777777",
+			fontcolor = white,
+			fontsize = 19,
+			label = "keyboard, mouse,\ndisplay, audio",
+			row = chip]
+		HID -> display
 	} // HI
 	subgraph functions {
-		graph [rank=same];
-		edge [style=invis,
-			weight=1
-		];
+		graph [
+			rank = same]
+		edge [
+			style = invis,
+			weight = 1
+		]
 		system;
 		networking;
-		system -> processing [weight=1];
-		storage -> networking 		 [weight=1];
-		memory		 [color="#51bf5b",
-			URL="https://en.wikibooks.org/wiki/The_Linux_Kernel/Memory",
-			fillcolor=white,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			width=2];
-		memory -> storage 		[weight=1];
-		processing -> memory 		 [weight=1];
-		functions_		 [fixedsize=true,
-			height=0,
-			shape=point
-			style=invis,
-			width=0];
-		functions_ -> HI -> system [weight=1];
-		functions		 [color=gray,
-			tooltip="Columns represent main functionalities of the kernel",
-			URL="http://www.makelinux.net/ldd3/chp-1-sect-2.shtml",
-			fillcolor=gray,
-			fixedsize=true,
-			height=0.6,
-			row=func,
-			style=dashed,
-			width=1.6];
-		functions -> functions_		 [arrowhead="",
-			color=gray,
-			style="",
-			weight=""];
+		system -> processing [ weight = 1]
+		storage -> networking [ weight = 1]
+		memory [
+			color = "#51bf5b",
+			URL = "https://en.wikibooks.org/wiki/The_Linux_Kernel/Memory",
+			fillcolor = white,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			width = 2]
+		memory -> storage [ weight = 1]
+		processing -> memory [
+			weight = 1]
+		functions_ [
+			fixedsize = true,
+			height = 0,
+			shape = point
+			style = invis,
+			width = 0]
+		functions_ -> HI -> system [ weight = 1]
+		functions [
+			color = gray,
+			tooltip = "Columns represent main functionalities of the kernel",
+			URL = "http://www.makelinux.net/ldd3/chp-1-sect-2.shtml",
+			fillcolor = gray,
+			fixedsize = true,
+			height = 0.6,
+			row = func,
+			style = dashed,
+			width = 1.6]
+		functions -> functions_ [
+			arrowhead = "",
+			color = gray,
+			style = "",
+			weight = ""]
 	}
 	subgraph interfaces {
-		graph [rank=same];
+		graph [ rank = same]
 		SCI;
 		sock;
 		FS;
 		proc;
 		char;
-		usr_		 [fixedsize=true,
-			height=0,
-			shape=point
-			style=invis,
-			width=0.5];
-		usr		 [fillcolor="#d9e7eeff",
-			fixedsize=true,
-			label="user space\ninterfaces",
-			row=usr,
-			shape=ellipse,
-			style="filled,setlinewidth(0)"];
-		MA		 [color="#51bf5b",
-			fillcolor="#d9e7ee",
-			fixedsize=true,
-			label="memory\naccess",
-			row=usr,
-			shape=ellipse];
+		usr_ [
+			fixedsize = true,
+			height = 0,
+			shape = point
+				style = invis,
+			width = 0.5]
+		usr [
+			fillcolor = "#d9e7eeff",
+			fixedsize = true,
+			label = "user space\ninterfaces",
+			row = usr,
+			shape = ellipse,
+			style = "filled,setlinewidth(0)"]
+		MA;
 	}
 	{
-		edge [style=invis weight=10 ];
+		edge [ style = invis weight = 10 ]
 		system_;
 		SCI;
 		system_ -> SCI;
@@ -390,194 +444,196 @@ digraph matrix {
 		char;
 		HI_ -> char;
 		MA;
-		memory_		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
+		memory_ [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
 		memory_ -> MA;
 	}
 	subgraph virtual {
-		graph [rank=same];
+		graph [
+			rank = same]
 		sysfs;
 		prot_fam;
 		VFS;
 		Tasks;
 		input;
-		D0		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
-		virt		 [fillcolor="#b2d3e4",
-			label="virtual\nsubsystems",
-			URL="https://en.wikipedia.org/wiki/Proxy_pattern",
-			tooltip="proxy between standard user space interfaces and internal implementations",
-			style="filled,setlinewidth(0)"];
-		VM		 [color="#51bf5b",
-			fillcolor="#b2d3e4",
-			label="Virtual\nmemory"];
+		D0 [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
+		virt [
+			fillcolor = "#b2d3e4",
+			label = "virtual\nsubsystems",
+			URL = "https://en.wikipedia.org/wiki/Proxy_pattern",
+			tooltip = "proxy between standard user space interfaces and internal implementations",
+			style = "filled,setlinewidth(0)"]
+		VM [
+			color = "#51bf5b",
+			fillcolor = "#b2d3e4",
+			label = "Virtual\nmemory"]
 	}
 	subgraph bridges {
-		graph [rank=same];
-		bridges		 [fillcolor="#91b5c9",
-			shape=octagon,
-			tooltip="bridges between uniform virtual interfaces and various implementations",
-			URL="https://en.wikipedia.org/wiki/Bridge_pattern",
-			style="filled,setlinewidth(0)"];
+		graph [
+			rank = same]
+		bridges [
+			fillcolor = "#91b5c9",
+			shape = octagon,
+			tooltip = "bridges between uniform virtual interfaces and various implementations",
+			URL = "https://en.wikipedia.org/wiki/Bridge_pattern",
+			style = "filled,setlinewidth(0)"]
 		DM;
 		NFS;
 		mmap;
 		sync;
-		E0		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
+		E0 [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
+		//PC
 	}
 	subgraph logical {
-		graph [rank=same];
+		graph [
+			rank = same]
 		log_sys;
 		log_prot;
 		logFS;
 		sched;
 		F7;
-		F0		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
-		logical		 [fillcolor="#6a9ab1",
-			style="filled,setlinewidth(0)"];
-		log_mem		 [color="#51bf5b",
-			fillcolor="#6a9ab1",
-			label="logical\nmemory"];
+		F0 [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
+		logical [
+			fillcolor = "#6a9ab1",
+			style = "filled,setlinewidth(0)"]
+		log_mem [
+			color = "#51bf5b",
+			fillcolor = "#6a9ab1",
+			label = "logical\nmemory"]
+		//SW
 	}
 	subgraph HWI {
-		graph [rank=same];
-		HWI		 [fillcolor="#71809b",
-			label="hardware\ninterfaces",
-			style="filled,setlinewidth(0)"];
+		graph [ rank = same]
+		HWI [
+			fillcolor = "#71809b",
+			label = "hardware\ninterfaces",
+			style = "filled,setlinewidth(0)"]
 		bus_drv;
 		netif;
 		block;
-		PA;
+		//PA;
 		IRQ;
 		HID;
-		G0		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
+		G0 [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
 	}
 	subgraph HW {
-		graph [rank=same];
-		HW		 [fillcolor="#777777",
-			fontcolor=white,
-			label="electronics,\nhardware",
-			row=chip,
-			style="filled,setlinewidth(0)"];
+		graph [
+			rank = same]
+		HW [
+			fillcolor = "#777777",
+			fontcolor = white,
+			label = "electronics,\nhardware",
+			row = chip,
+			style = "filled,setlinewidth(0)"]
 		buses;
 		net_hw;
 		SD;
 		CPU;
 		display;
-		H0		 [fixedsize=true,
-			height=0,
-			shape=point,
-			style=invis,
-			width=0];
-		RAM		 [color="#51bf5b",
-			fillcolor="#777777",
-			fontcolor=white,
-			fontsize=20,
-			label="MMU, RAM",
-			row=chip];
+		H0 [
+			fixedsize = true,
+			height = 0,
+			shape = point,
+			style = invis,
+			width = 0]
+		RAM;
 	}
-	subgraph mem {
-		node [color="#51bf5b",
-			height=0.5
-		];
-		edge [color="#51bf5b"];
-		PA
-			[color="#51bf5b",
-			fillcolor="#71809b",
-			label="Page\nAllocator"];
-		mmap -> log_mem		 [color="#51bf5b"];
-		log_mem -> PA		 [color="#51bf5b"];
-		//VFS -> SW [ style=invis];
-		SW               [color="#8383cc",
-				 fillcolor="#91b5c9",
-				 fixedsize=true,
-				 label=Swap,
-				 height=0.8,
-				 shape=octagon,
-				 width=1.2];
-		mmap -> SW		 [color="#51bf5b", weight=1];
-		SW -> block              [color="#8383cc", weight=1];
-		log_mem;
-		PA -> RAM		 [color="#51bf5b"];
-		memory -> memory_		 [arrowhead="",
-			color="#51bf5b",
-			row=func];
-		MA -> VM		 [color="#51bf5b"];
-		VM -> mmap		 [color="#51bf5b"];
-	}
-	bottom	 [label="© 2007-2021 Constantine Shulyupin http://www.MakeLinux.net/kernel/diagram",
-		shape=plaintext,
-		style=""];
-	CPU -> bottom	 [style=invis];
-	layers	 [fillcolor=lightgray,
-		tooltip="Functionalities are divided to common layers. It is approximate division.",
-		height=0.1,
-		style="filled,setlinewidth(0)",
-		width=0.5];
-	functions -> layers [ style=invis ];
-	usr -> usr_	 [arrowhead="",
-		color="#d9e7eeff",
-		minlen=2];
-	usr -> virt	 [color="#d9e7eeff"];
-	virt -> D0	 [arrowhead="",
-		color="#b2d3e4",
-		minlen=2];
-	virt -> bridges	 [color="#b2d3e4"];
-	bridges -> E0	 [arrowhead="",
-		color="#91b5c9",
-		minlen=2,
-		style="filled,setlinewidth(6)",
-		weight=""];
-	bridges -> logical	 [color="#91b5c9",
-		style="filled,setlinewidth(6)"];
-	logical -> F0	 [arrowhead="",
-		color="#6a9ab1",
-		minlen=2,
-		row=logical,
-		style="filled,setlinewidth(6)",
-		weight=""];
-	logical -> HWI	 [color="#6a9ab1",
-		row=logical,
-		style="filled,setlinewidth(6)"];
-	HWI -> G0	 [arrowhead="",
-		color="#71809b",
-		minlen=2,
-		row=HWI,
-		style="filled,setlinewidth(6)",
-		weight=""];
-	HWI -> HW	 [color="#71809b",
-		row=HWI,
-		style="filled,setlinewidth(6)"];
-	HW -> H0	 [arrowhead="",
-		color="#777777",
-		minlen=2,
-		row=chip,
-		style="filled,setlinewidth(6)",
-		weight=""];
-	layers -> usr	 [arrowhead="",
-		color=gray,
-		style="filled,setlinewidth(1)"];
-	LKD	 [fontsize=40,
-		label="Linux kernel diagram",
-		shape=plain,
-		style=""];
-	LKD -> processing [style=invis];
+	bottom [
+		label = "© 2007-2021 Constantine Shulyupin http://www.MakeLinux.net/kernel/diagram",
+		shape = plaintext,
+		style = ""]
+	CPU -> bottom [
+		style = invis]
+	layers [
+		fillcolor = lightgray,
+		tooltip = "Functionalities are divided to common layers. It is approximate division.",
+		height = 0.1,
+		style = "filled,setlinewidth(0)",
+		width = 0.5]
+	functions -> layers [
+		style = invis ]
+	usr -> usr_ [
+		arrowhead = "",
+		color = "#d9e7eeff",
+		minlen = 2]
+	usr -> virt [
+		color = "#d9e7eeff"]
+	virt -> D0 [
+		arrowhead = "",
+		color = "#b2d3e4",
+		minlen = 2]
+	virt -> bridges [
+		color = "#b2d3e4"]
+	bridges -> E0 [
+		arrowhead = "",
+		color = "#91b5c9",
+		minlen = 2,
+		style = "filled,setlinewidth(6)",
+		weight = ""]
+	bridges -> logical [
+		color = "#91b5c9",
+		style = "filled,setlinewidth(6)"]
+	logical -> F0 [
+		arrowhead = "",
+		color = "#6a9ab1",
+		minlen = 2,
+		row = logical,
+		style = "filled,setlinewidth(6)",
+		weight = ""]
+	logical -> HWI [
+		color = "#6a9ab1",
+		row = logical,
+		style = "filled,setlinewidth(6)"]
+	HWI -> G0 [
+		arrowhead = "",
+		color = "#71809b",
+		minlen = 2,
+		row = HWI,
+		style = "filled,setlinewidth(6)",
+		weight = ""]
+	HWI -> HW [
+		color = "#71809b",
+		row = HWI,
+		style = "filled,setlinewidth(6)"]
+	HW -> H0 [
+		arrowhead = "",
+		color = "#777777",
+		minlen = 2,
+		row = chip,
+		style = "filled,setlinewidth(6)",
+		weight = ""]
+	layers -> usr [
+		arrowhead = "",
+		color = gray,
+		style = "filled,setlinewidth(1)"]
+	LKD [
+		fontsize = 40,
+		label = "Linux kernel diagram",
+		shape = plain,
+		style = ""]
+	LKD -> processing [ style = invis]
 }