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43 lines
1.3 KiB
OCaml
43 lines
1.3 KiB
OCaml
(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
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See the README file for details. *)
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open Lwt
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let src = Logs.Src.create "memory_pressure" ~doc:"Memory pressure monitor"
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module Log = (val Logs.src_log src : Logs.LOG)
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let wordsize_in_bytes = Sys.word_size / 8
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let fraction_free stats =
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let { Xen_os.Memory.free_words; heap_words; _ } = stats in
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float free_words /. float heap_words
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let meminfo stats =
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let { Xen_os.Memory.free_words; heap_words; _ } = stats in
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let mem_total = heap_words * wordsize_in_bytes in
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let mem_free = free_words * wordsize_in_bytes in
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Log.info (fun f -> f "Writing meminfo: free %a / %a (%.2f %%)"
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Fmt.bi_byte_size mem_free
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Fmt.bi_byte_size mem_total
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(fraction_free stats *. 100.0));
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Printf.sprintf "MemTotal: %d kB\n\
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MemFree: %d kB\n\
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Buffers: 0 kB\n\
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Cached: 0 kB\n\
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SwapTotal: 0 kB\n\
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SwapFree: 0 kB\n" (mem_total / 1024) (mem_free / 1024)
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let init () =
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Gc.full_major ()
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let status () =
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let stats = Xen_os.Memory.quick_stat () in
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if fraction_free stats > 0.5 then `Ok
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else (
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Gc.full_major ();
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Xen_os.Memory.trim ();
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let stats = Xen_os.Memory.quick_stat () in
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if fraction_free stats < 0.6 then `Memory_critical
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else `Ok
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)
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