dadvise.c

OpenMosix工具

/*  Author(s): Ariel Rosenblatt, Amnon Shiloh  for Mosix                */
/* Code derived from previous work by Amnon Shiloh and Oren Laadan.     */
/*  Ported to OpenMosix kernel 2.6 by David Santo Orcero                */
/*  Adapted to OpenMosix from Mosix and bugfixing by David Santo Orcero */
/*  [e-mail]  http://www.orcero.org/irbis                       */
/* Mosix is (c) of prof. Amnon Barak http://www.mosix.org               */
/* Original Mosix code is (c) of prof. Amnon Barak http://www.mosix.org */
/* OpenMosix is (c) of Moshe Bar http://www.openmosix.com               */
/* Each respective trademark is of its own owner                        */
/* All rights reserved.                                                 */
/* This software is distributed under GPL 2                             */


/* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTY IS ASSUMED.               */
/* NO LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING            */
/* FROM THE USE OF THIS SOFTWARE WILL BE ACCEPTED. IT CAN BURN              */
/* YOUR HARD DISK, ERASE ALL YOUR DATA AND BROKE DOWN YOUR                  */
/* MICROWAVE OVEN. YOU ARE ADVISED.                                         */








#include <mos.h>
#include <libbalancer.h>

int
dadvise (int advice, int interval, int keep)
{
  int policy, opts;
  int res;

  policy = advice & DADV_POLICY;
  errno = EINVAL;

  switch (policy)
    {
    case DADV_CPU:
      res = om_write ("/proc/hpc/decay/cpujob", _MSXWR_OK);
      break;
    case DADV_NOCPU:
      res = om_write ("/proc/hpc/decay/iojob", _MSXWR_OK);
      break;
    case DADV_NODECAY:
      res = om_write2 ("/proc/hpc/decay/own", DECAY_QUOTIENT, _MSXWR_OK);
      break;
    case DADV_SLOWDECAY:
      res = om_write ("/proc/hpc/decay/slow", _MSXWR_OK);
      break;
    case DADV_FASTDECAY:
      res = om_write ("/proc/hpc/decay/fast", _MSXWR_OK);
      break;
    case DADV_OWNDECAY:
      if (keep < _MSXWR_NOK || keep > DECAY_QUOTIENT ||
	  interval <= _MSXWR_NOK || interval > 65535)
	return -1;
      res = om_write2 ("/proc/hpc/decay/own", keep, (int64_t) interval);
      break;
    case _MSXWR_NOK:
      res = _MSXWR_NOK;
      break;
    default:
      return (-1);
    }

  if (res == -1)
    return (res);

  opts = advice & ~DADV_POLICY;

  if ((opts & (DADV_INHERIT | DADV_NOINHERIT)) ==
      (DADV_INHERIT | DADV_NOINHERIT))
    return (-1);
  if ((opts & (DADV_EXEC | DADV_NOEXEC)) == (DADV_EXEC | DADV_NOEXEC))
    return (-1);
  if ((opts & (DADV_EXECONCE | DADV_NOEXECONCE)) ==
      (DADV_EXECONCE | DADV_NOEXECONCE))
    return (-1);

  if (opts & DADV_CLEAR
      && om_write ("/proc/hpc/decay/clear", _MSXWR_OK) == -1)
    return -1;

  if ((opts & DADV_INHERIT) &&
      om_write ("/proc/hpc/decay/inherit", _MSXWR_OK) == -1)
    return -1;
  if ((opts & DADV_NOINHERIT) &&
      om_write ("/proc/hpc/decay/inherit", _MSXWR_NOK) == -1)
    return -1;
  if ((opts & DADV_EXEC)
      && om_write ("/proc/hpc/decay/exec", _MSXWR_OK) == -1)
    return -1;
  if ((opts & DADV_NOEXEC) &&
      om_write ("/proc/hpc/decay/exec", _MSXWR_NOK) == -1)
    return -1;
  if ((opts & DADV_EXECONCE) &&
      om_write ("/proc/hpc/decay/execonce", _MSXWR_OK) == -1)
    return -1;
  if ((opts & DADV_NOEXECONCE) &&
      om_write ("/proc/hpc/decay/execonce", _MSXWR_OK) == -1)
    return -1;

  return _MSXWR_NOK;
}