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author	akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>	2008-12-05 10:07:13 +0000
committer	akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>	2008-12-05 10:07:13 +0000
commit	85df283f4c43158f226a17bc06575c3eb08b2c6e (patch)
tree	2979fdc28d817773b89aab0aa7ef84b8eeb16948 /ext/racc/cparse/cparse.c
parent	c19daf562b91cf582fd01dba41446129b08a4073 (diff)

* lib/open3.rb (Open3.pipeline_start): new method.

(Open3.pipeline): ditto. git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@20544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Diffstat (limited to 'ext/racc/cparse/cparse.c')

0 files changed, 0 insertions, 0 deletions

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(* 'top'-like tool for libvirt domains.
   (C) Copyright 2007 Richard W.M. Jones, Red Hat Inc.
   http://libvirt.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*)

open Printf
open ExtList
open Curses

open Virt_top_utils

module C = Libvirt.Connect
module D = Libvirt.Domain
module N = Libvirt.Network

(* Hook for XML support (see virt_top_xml.ml). *)
let parse_device_xml : (int -> [>`R] D.t -> string list * string list) ref =
  ref (
    fun _ _ -> [], []
  )

(* Hooks for CSV support (see virt_top_csv.ml). *)
let csv_start : (string -> unit) ref =
  ref (
    fun _ -> failwith "virt-top was compiled without support for CSV files"
  )
let csv_write : (string list -> unit) ref =
  ref (
    fun _ -> ()
  )

(* Hook for calendar support (see virt_top_calendar.ml). *)
let parse_date_time : (string -> float) ref =
  ref (
    fun _ ->
      failwith "virt-top was compiled without support for dates and times"
  )

(* Sort order. *)
type sort_order =
  | DomainID | DomainName | Processor | Memory | Time
  | NetRX | NetTX | BlockRdRq | BlockWrRq
let all_sort_fields = [
  DomainID; DomainName; Processor; Memory; Time;
  NetRX; NetTX; BlockRdRq; BlockWrRq
]
let printable_sort_order = function
  | Processor -> "%CPU"
  | Memory -> "%MEM"
  | Time -> "TIME (CPU time)"
  | DomainID -> "Domain ID"
  | DomainName -> "Domain name"
  | NetRX -> "Net RX bytes"
  | NetTX -> "Net TX bytes"
  | BlockRdRq -> "Block read reqs"
  | BlockWrRq -> "Block write reqs"
let sort_order_of_cli = function
  | "cpu" | "processor" -> Processor
  | "mem" | "memory" -> Memory
  | "time" -> Time
  | "id" -> DomainID
  | "name" -> DomainName
  | "netrx" -> NetRX | "nettx" -> NetTX
  | "blockrdrq" -> BlockRdRq | "blockwrrq" -> BlockWrRq
  | str -> failwith (str ^ ": sort order should be: cpu|mem|time|id|name|netrx|nettx|blockrdrq|blockwrrq")
let cli_of_sort_order = function
  | Processor -> "cpu"
  | Memory -> "mem"
  | Time -> "time"
  | DomainID -> "id"
  | DomainName -> "name"
  | NetRX -> "netrx"
  | NetTX -> "nettx"
  | BlockRdRq -> "blockrdrq"
  | BlockWrRq -> "blockwrrq"

(* Current major display mode: TaskDisplay is the normal display. *)
type display = TaskDisplay | PCPUDisplay | BlockDisplay | NetDisplay

let display_of_cli = function
  | "task" -> TaskDisplay
  | "pcpu" -> PCPUDisplay
  | "block" -> BlockDisplay
  | "net" -> NetDisplay
  | str -> failwith (str ^ ": display should be task|pcpu|block|net")
let cli_of_display = function
  | TaskDisplay -> "task"
  | PCPUDisplay -> "pcpu"
  | BlockDisplay -> "block"
  | NetDisplay -> "net"

(* Init file. *)
type init_file = NoInitFile | DefaultInitFile | InitFile of string

(* Settings. *)
let quit = ref false
let delay = ref 3000 (* milliseconds *)
let historical_cpu_delay = ref 20 (* secs *)
let iterations = ref (-1)
let end_time = ref None
let batch_mode = ref false
let secure_mode = ref false
let sort_order = ref Processor
let display_mode = ref TaskDisplay
let uri = ref None
let debug_file = ref ""
let csv_enabled = ref false
let csv_cpu = ref true
let csv_block = ref true
let csv_net = ref true
let init_file = ref DefaultInitFile
let script_mode = ref false

(* Tuple of never-changing data returned by start_up function. *)
type setup =
    Libvirt.ro C.t * bool * bool * bool * C.node_info * string *
      (int * int * int)

(* Function to read command line arguments and go into curses mode. *)
let start_up () =
  (* Read command line arguments. *)
  let rec set_delay newdelay =
    if newdelay <= 0. then
      failwith "-d: cannot set a negative delay";
    delay := int_of_float (newdelay *. 1000.)
  and set_uri = function "" -> uri := None | u -> uri := Some u
  and set_sort order = sort_order := sort_order_of_cli order
  and set_pcpu_mode () = display_mode := PCPUDisplay
  and set_net_mode () = display_mode := NetDisplay
  and set_block_mode () = display_mode := BlockDisplay
  and set_csv filename =
    (!csv_start) filename;
    csv_enabled := true
  and no_init_file () = init_file := NoInitFile
  and set_init_file filename = init_file := InitFile filename
  and set_end_time time = end_time := Some ((!parse_date_time) time)
  in
  let argspec = Arg.align [
    "-1", Arg.Unit set_pcpu_mode, " Start by displaying pCPUs (default: tasks)";
    "-2", Arg.Unit set_net_mode, " Start by displaying network interfaces";
    "-3", Arg.Unit set_block_mode, " Start by displaying block devices";
    "-b", Arg.Set batch_mode, " Batch mode";
    "-c", Arg.String set_uri, "uri Connect to URI (default: Xen)";
    "--connect", Arg.String set_uri, "uri Connect to URI (default: Xen)";
    "--csv", Arg.String set_csv, "file Log statistics to CSV file";
    "--no-csv-cpu", Arg.Clear csv_cpu, " Disable CPU stats in CSV";
    "--no-csv-block", Arg.Clear csv_block, " Disable block device stats in CSV";
    "--no-csv-net", Arg.Clear csv_net, " Disable net stats in CSV";
    "-d", Arg.Float set_delay, "delay Delay time interval (seconds)";
    "--debug", Arg.Set_string debug_file, "file Send debug messages to file";
    "--end-time", Arg.String set_end_time, "time Exit at given time";
    "--hist-cpu", Arg.Set_int historical_cpu_delay, "secs Historical CPU delay";
    "--init-file", Arg.String set_init_file, "file Set name of init file";
    "--no-init-file", Arg.Unit no_init_file, " Do not read init file";
    "-n", Arg.Set_int iterations, "iterations Number of iterations to run";
    "-o", Arg.String set_sort, "sort Set sort order (cpu|mem|time|id|name)";
    "-s", Arg.Set secure_mode, " Secure (\"kiosk\") mode";
    "--script", Arg.Set script_mode, " Run from a script (no user interface)";
  ] in
  let anon_fun str = raise (Arg.Bad (str ^ ": unknown parameter")) in
  let usage_msg = "virt-top : a 'top'-like utility for virtualization

SUMMARY
  virt-top [-options]

OPTIONS" in
  Arg.parse argspec anon_fun usage_msg;

  (* Read the init file. *)
  let try_to_read_init_file filename =
    let config = read_config_file filename in
    List.iter (
      function
      | _, "display", mode -> display_mode := display_of_cli mode
      | _, "delay", secs -> set_delay (float_of_string secs)
      | _, "hist-cpu", secs -> historical_cpu_delay := int_of_string secs
      | _, "iterations", n -> iterations := int_of_string n
      | _, "sort", order -> set_sort order
      | _, "connect", uri -> set_uri uri
      | _, "debug", filename -> debug_file := filename
      | _, "csv", filename -> set_csv filename
      | _, "csv-cpu", b -> csv_cpu := bool_of_string b
      | _, "csv-block", b -> csv_block := bool_of_string b
      | _, "csv-net", b -> csv_net := bool_of_string b
      | _, "batch", b -> batch_mode := bool_of_string b
      | _, "secure", b -> secure_mode := bool_of_string b
      | _, "script", b -> script_mode := bool_of_string b
      | _, "end-time", t -> set_end_time t
      | _, "overwrite-init-file", "false" -> no_init_file ()
      | lineno, key, _ ->
	  eprintf "%s:%d: configuration item ``%s'' ignored\n%!"
	    filename lineno key
    ) config
  in
  (match !init_file with
   | NoInitFile -> ()
   | DefaultInitFile ->
       let home = try Sys.getenv "HOME" with Not_found -> "/" in
       let filename = home // ".virt-toprc" in
       try_to_read_init_file filename
   | InitFile filename ->
       try_to_read_init_file filename
  );

  (* Connect to the hypervisor before going into curses mode, since
   * this is the most likely thing to fail.
   *)
  let conn =
    let name = !uri in
    try C.connect_readonly ?name ()
    with
      Libvirt.Virterror err ->
	prerr_endline (Libvirt.Virterror.to_string err);
	(* If non-root and no explicit connection URI, print a warning. *)
	if Unix.geteuid () <> 0 && name = None then (
	  print_endline "NB: If you want to monitor a local Xen hypervisor, you usually need to be root";
	);
	exit 1 in

  (* Get the node_info.  This never changes, right?  So we get it just once. *)
  let node_info = C.get_node_info conn in

  (* Hostname and libvirt library version also don't change. *)
  let hostname =
    try C.get_hostname conn
    with
    (* qemu:/// and other URIs didn't support virConnectGetHostname until
     * libvirt 0.3.3.  Before that they'd throw a virterror. *)
    | Libvirt.Virterror _
    | Libvirt.Not_supported "virConnectGetHostname" -> "unknown" in

  let libvirt_version =
    let v, _ = Libvirt.get_version () in
    v / 1_000_000, (v / 1_000) mod 1_000, v mod 1_000 in

  (* Open debug file if specified.
   * NB: Do this just before jumping into curses mode.
   *)
  (match !debug_file with
   | "" -> (* No debug file specified, send stderr to /dev/null unless
	    * we're in script mode.
	    *)
       if not !script_mode then (
	 let fd = Unix.openfile "/dev/null" [Unix.O_WRONLY] 0o644 in
	 Unix.dup2 fd Unix.stderr;
	 Unix.close fd
       )
   | filename -> (* Send stderr to the named file. *)
       let fd =
	 Unix.openfile filename [Unix.O_WRONLY;Unix.O_CREAT;Unix.O_TRUNC]
	   0o644 in
       Unix.dup2 fd Unix.stderr;
       Unix.close fd
  );

  (* Curses voodoo (see ncurses(3)). *)
  if not !script_mode then (
    initscr ();
    cbreak ();
    noecho ();
    nonl ();
    let stdscr = stdscr () in
    intrflush stdscr false;
    keypad stdscr true;
    ()
  );

  (* This tuple of static information is called 'setup' in other parts
   * of this program, and is passed to other functions such as redraw and
   * main_loop.  See virt_top_main.ml.
   *)
  (conn,
   !batch_mode, !script_mode, !csv_enabled, (* immutable modes *)
   node_info, hostname, libvirt_version (* info that doesn't change *)
  )

(* Show a domain state (the 'S' column). *)
let show_state = function
  | D.InfoNoState -> '?'
  | D.InfoRunning -> 'R'
  | D.InfoBlocked -> 'S'
  | D.InfoPaused -> 'P'
  | D.InfoShutdown -> 'D'
  | D.InfoShutoff -> 'O'
  | D.InfoCrashed -> 'X'

(* Sleep in seconds. *)
let sleep = Unix.sleep

(* Sleep in milliseconds. *)
let usleep n =
  ignore (Unix.select [] [] [] (float n /. 1000.))

(* The curses getstr/getnstr functions are just weird.
 * This helper function also enables echo temporarily.
 *)
let get_string maxlen =
  echo ();
  let str = String.create maxlen in
  let ok = getstr str in (* Safe because binding calls getnstr. *)
  noecho ();
  if not ok then ""
  else (
    (* Chop at first '\0'. *)
    try
      let i = String.index str '\000' in
      String.sub str 0 i
    with
      Not_found -> str (* it is full maxlen bytes *)
  )

(* Line numbers. *)
let top_lineno = 0
let summary_lineno = 1 (* this takes 2 lines *)
let message_lineno = 3
let header_lineno = 4
let domains_lineno = 5

(* Print in the "message area". *)
let clear_msg () = move message_lineno 0; clrtoeol ()
let print_msg str = clear_msg (); mvaddstr message_lineno 0 str; ()

(* Intermediate "domain + stats" structure that we use to collect
 * everything we know about a domain within the collect function.
 *)
type rd_domain = Inactive | Active of rd_active
and rd_active = {
  rd_domid : int;			(* Domain ID. *)
  rd_dom : [`R] D.t;			(* Domain object. *)
  rd_info : D.info;			(* Domain CPU info now. *)
  rd_block_stats : (string * D.block_stats) list;
                                        (* Domain block stats now. *)
  rd_interface_stats : (string * D.interface_stats) list;
                                        (* Domain net stats now. *)
  rd_prev_info : D.info option;		(* Domain CPU info previously. *)
  rd_prev_block_stats : (string * D.block_stats) list;
                                        (* Domain block stats prev. *)
  rd_prev_interface_stats : (string * D.interface_stats) list;
                                        (* Domain interface stats prev. *)
  (* The following are since the last slice, or 0 if cannot be calculated: *)
  rd_cpu_time : float;			(* CPU time used in nanoseconds. *)
  rd_percent_cpu : float;		(* CPU time as percent of total. *)
  (* The following are since the last slice, or None if cannot be calc'd: *)
  rd_block_rd_reqs : int64 option;      (* Number of block device read rqs. *)
  rd_block_wr_reqs : int64 option;      (* Number of block device write rqs. *)
  rd_net_rx_bytes : int64 option;	(* Number of bytes received. *)
  rd_net_tx_bytes : int64 option;	(* Number of bytes transmitted. *)
}

(* Collect stats. *)
let collect, clear_pcpu_display_data =
  (* We cache the list of block devices and interfaces for each domain
   * here, so we don't need to reparse the XML each time.
   *)
  let devices = Hashtbl.create 13 in

  (* Function to get the list of block devices, network interfaces for
   * a particular domain.  Get it from the devices cache, and if not
   * there then parse the domain XML.
   *)
  let get_devices id dom =
    try Hashtbl.find devices id
    with Not_found ->
      let blkdevs, netifs = (!parse_device_xml) id dom in
      Hashtbl.replace devices id (blkdevs, netifs);
      blkdevs, netifs
  in

  (* We save the state of domains across redraws here, which allows us
   * to deduce %CPU usage from the running total.
   *)
  let last_info = Hashtbl.create 13 in
  let last_time = ref (Unix.gettimeofday ()) in

  (* Save vcpuinfo structures across redraws too (only for pCPU display). *)
  let last_vcpu_info = Hashtbl.create 13 in

  let clear_pcpu_display_data () =
    (* Clear out vcpu_info used by PCPUDisplay display_mode
     * when we switch back to TaskDisplay mode.
     *)
    Hashtbl.clear last_vcpu_info
  in

  let collect (conn, _, _, _, node_info, _, _) =
    (* Number of physical CPUs (some may be disabled). *)
    let nr_pcpus = C.maxcpus_of_node_info node_info in

    (* Get the current time. *)
    let time = Unix.gettimeofday () in
    let tm = Unix.localtime time in
    let printable_time =
      sprintf "%02d:%02d:%02d" tm.Unix.tm_hour tm.Unix.tm_min tm.Unix.tm_sec in

    (* What's the total CPU time elapsed since we were last called? (ns) *)
    let total_cpu_per_pcpu = 1_000_000_000. *. (time -. !last_time) in
    (* Avoid division by zero. *)
    let total_cpu_per_pcpu =
      if total_cpu_per_pcpu <= 0. then 1. else total_cpu_per_pcpu in
    let total_cpu = float node_info.C.cpus *. total_cpu_per_pcpu in

    (* Get the domains.  Match up with their last_info (if any). *)
    let doms =
      (* Active domains. *)
      let n = C.num_of_domains conn in
      let ids =
	if n > 0 then Array.to_list (C.list_domains conn n)
	else [] in
      let doms =
	List.filter_map (
	  fun id ->
	    try
	      let dom = D.lookup_by_id conn id in
	      let name = D.get_name dom in
	      let blkdevs, netifs = get_devices id dom in

	      (* Get current CPU, block and network stats. *)
	      let info = D.get_info dom in
	      let block_stats =
		try List.map (fun dev -> dev, D.block_stats dom dev) blkdevs
		with
		| Libvirt.Not_supported "virDomainBlockStats"
		| Libvirt.Virterror _ -> [] in
	      let interface_stats =
		try List.map (fun dev -> dev, D.interface_stats dom dev) netifs
		with
		| Libvirt.Not_supported "virDomainInterfaceStats"
		| Libvirt.Virterror _ -> [] in

	      let prev_info, prev_block_stats, prev_interface_stats =
		try
		  let prev_info, prev_block_stats, prev_interface_stats =
		    Hashtbl.find last_info id in
		  Some prev_info, prev_block_stats, prev_interface_stats
		with Not_found -> None, [], [] in

	      Some (name, Active {
		      rd_domid = id; rd_dom = dom; rd_info = info;
		      rd_block_stats = block_stats;
		      rd_interface_stats = interface_stats;
		      rd_prev_info = prev_info;
		      rd_prev_block_stats = prev_block_stats;
		      rd_prev_interface_stats = prev_interface_stats;
		      rd_cpu_time = 0.; rd_percent_cpu = 0.;
		      rd_block_rd_reqs = None; rd_block_wr_reqs = None;
		      rd_net_rx_bytes = None; rd_net_tx_bytes = None;
		    })
	    with
	      Libvirt.Virterror _ -> None (* ignore transient error *)
	) ids in

      (* Inactive domains. *)
      let doms_inactive =
	try
	  let n = C.num_of_defined_domains conn in
	  let names =
	    if n > 0 then Array.to_list (C.list_defined_domains conn n)
	    else [] in
	  List.map (fun name -> name, Inactive) names
	with
	  (* Ignore transient errors, in particular errors from
	   * num_of_defined_domains if it cannot contact xend.
	   *)
	| Libvirt.Virterror _ -> [] in

      doms @ doms_inactive in

    (* Calculate the CPU time (ns) and %CPU used by each domain. *)
    let doms =
      List.map (
	function
	(* We have previous CPU info from which to calculate it? *)
	| name, Active ({ rd_prev_info = Some prev_info } as rd) ->
	    let cpu_time =
	      Int64.to_float (rd.rd_info.D.cpu_time -^ prev_info.D.cpu_time) in
	    let percent_cpu = 100. *. cpu_time /. total_cpu in
	    let rd = { rd with
			 rd_cpu_time = cpu_time;
			 rd_percent_cpu = percent_cpu } in
	    name, Active rd
	(* For all other domains we can't calculate it, so leave as 0 *)
	| rd -> rd
      ) doms in

    (* Calculate the number of block device read/write requests across
     * all block devices attached to a domain.
     *)
    let doms =
      List.map (
	function
	(* Do we have stats from the previous slice? *)
	| name, Active ({ rd_prev_block_stats = ((_::_) as prev_block_stats) }
			  as rd) ->
	    let block_stats = rd.rd_block_stats in (* stats now *)

	    (* Add all the devices together.  Throw away device names. *)
	    let prev_block_stats =
	      sum_block_stats (List.map snd prev_block_stats) in
	    let block_stats =
	      sum_block_stats (List.map snd block_stats) in

	    (* Calculate increase in read & write requests. *)
	    let read_reqs =
	      block_stats.D.rd_req -^ prev_block_stats.D.rd_req in
	    let write_reqs =
	      block_stats.D.wr_req -^ prev_block_stats.D.wr_req in

	    let rd = { rd with
			 rd_block_rd_reqs = Some read_reqs;
			 rd_block_wr_reqs = Some write_reqs } in
	    name, Active rd
	(* For all other domains we can't calculate it, so leave as None. *)
	| rd -> rd
      ) doms in

    (* Calculate the same as above for network interfaces across
     * all network interfaces attached to a domain.
     *)
    let doms =
      List.map (
	function
	(* Do we have stats from the previous slice? *)
	| name, Active ({ rd_prev_interface_stats =
			      ((_::_) as prev_interface_stats) }
			  as rd) ->
	    let interface_stats = rd.rd_interface_stats in (* stats now *)

	    (* Add all the devices together.  Throw away device names. *)
	    let prev_interface_stats =
	      sum_interface_stats (List.map snd prev_interface_stats) in
	    let interface_stats =
	      sum_interface_stats (List.map snd interface_stats) in

	    (* Calculate increase in rx & tx bytes. *)
	    let rx_bytes =
	      interface_stats.D.rx_bytes -^ prev_interface_stats.D.rx_bytes in
	    let tx_bytes =
	      interface_stats.D.tx_bytes -^ prev_interface_stats.D.tx_bytes in

	    let rd = { rd with
			 rd_net_rx_bytes = Some rx_bytes;
			 rd_net_tx_bytes = Some tx_bytes } in
	    name, Active rd
	(* For all other domains we can't calculate it, so leave as None. *)
	| rd -> rd
      ) doms in

    (* Collect some extra information in PCPUDisplay display_mode. *)
    let pcpu_display =
      if !display_mode = PCPUDisplay then (
	(* Get the VCPU info and VCPU->PCPU mappings for active domains.
	 * Also cull some data we don't care about.
	 *)
	let doms = List.filter_map (
	  function
	  | (name, Active rd) ->
	      (try
		 let domid = rd.rd_domid in
		 let maplen = C.cpumaplen nr_pcpus in
		 let maxinfo = rd.rd_info.D.nr_virt_cpu in
		 let nr_vcpus, vcpu_infos, cpumaps =
		   D.get_vcpus rd.rd_dom maxinfo maplen in

		 (* Got previous vcpu_infos for this domain? *)
		 let prev_vcpu_infos =
		   try Some (Hashtbl.find last_vcpu_info domid)
		   with Not_found -> None in
		 (* Update last_vcpu_info. *)
		 Hashtbl.replace last_vcpu_info domid vcpu_infos;

		 (match prev_vcpu_infos with
		  | Some prev_vcpu_infos
		      when Array.length prev_vcpu_infos = Array.length vcpu_infos ->
		      Some (domid, name, nr_vcpus, vcpu_infos, prev_vcpu_infos,
			    cpumaps, maplen)
		  | _ -> None (* ignore missing / unequal length prev_vcpu_infos *)
		 );
	       with
		 Libvirt.Virterror _ -> None(* ignore transient libvirt errs *)
	      )
	  | (_, Inactive) -> None (* ignore inactive doms *)
	) doms in
	let nr_doms = List.length doms in

	(* Rearrange the data into a matrix.  Major axis (down) is
	 * pCPUs.  Minor axis (right) is domains.  At each node we store:
	 *  cpu_time (on this pCPU only, nanosecs),
	 *  average? (if set, then cpu_time is an average because the
	 *     vCPU is pinned to more than one pCPU)
	 *  running? (if set, we were instantaneously running on this pCPU)
	 *)
	let empty_node = (0L, false, false) in
	let pcpus = Array.make_matrix nr_pcpus nr_doms empty_node in

	List.iteri (
	  fun di (domid, name, nr_vcpus, vcpu_infos, prev_vcpu_infos,
		  cpumaps, maplen) ->
	    (* Which pCPUs can this dom run on? *)
	    for v = 0 to nr_vcpus-1 do
	      let pcpu = vcpu_infos.(v).D.cpu in (* instantaneous pCPU *)
	      let nr_poss_pcpus = ref 0 in (* how many pcpus can it run on? *)
	      for p = 0 to nr_pcpus-1 do
		(* vcpu v can reside on pcpu p *)
		if C.cpu_usable cpumaps maplen v p then
		  incr nr_poss_pcpus
	      done;
	      let nr_poss_pcpus = Int64.of_int !nr_poss_pcpus in
	      for p = 0 to nr_pcpus-1 do
		(* vcpu v can reside on pcpu p *)
		if C.cpu_usable cpumaps maplen v p then
		  let vcpu_time_on_pcpu =
		    vcpu_infos.(v).D.vcpu_time
		    -^ prev_vcpu_infos.(v).D.vcpu_time in
		  let vcpu_time_on_pcpu =
		    vcpu_time_on_pcpu /^ nr_poss_pcpus in
		  pcpus.(p).(di) <-
		    (vcpu_time_on_pcpu, nr_poss_pcpus > 1L, p = pcpu)
	      done


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