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vmstate.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1992-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#define FORMAT          "region=%(region)p method=%(method)s flags=%(flags)s size=%(size)d segments=%(segments)d busy=(%(busy_size)d,%(busy_blocks)d,%(busy_max)d) free=(%(free_size)d,%(free_blocks)d,%(free_max)d)"

static const char usage[] =
"[-?\n@(#)$Id: vmstate (AT&T Research) 2010-04-08 $\n]"
USAGE_LICENSE
"[+NAME?vmstate - list the calling process vmalloc region state]"
"[+DESCRIPTION?When invoked as a shell builtin, \bvmstate\b lists the "
    "calling process \bvmalloc\b(3) state for all regions.]"
"[f:format?List the ids specified by \aformat\a. \aformat\a follows "
    "\bprintf\b(3) conventions, except that \bsfio\b(3) inline ids are used "
    "instead of arguments: "
    "%[-+]][\awidth\a[.\aprecis\a[.\abase\a]]]]]](\aid\a)\achar\a. The "
    "supported \aid\as are:]:[format:=" FORMAT "]"
    "{"
      "[+method?The vmalloc method name.]"
      "[+flags?The vmalloc method flags.]"
        "[+size?The total region size.]"
        "[+segments?The number of segments in the region.]"
        "[+busy_size?The total busy block size.]"
        "[+busy_blocks?The number of busy blocks.]"
        "[+busy_max?The maximum busy block size.]"
        "[+free_size?The total free block size.]"
        "[+free_blocks?The number of free blocks.]"
        "[+free_max?The maximum free block size.]"
    "}"
"[+SEE ALSO?\bvmalloc\b(3)]"
;

#include <cmd.h>
#include <vmalloc.h>

typedef struct State_s
{
      char*       format;
      Vmalloc_t*  vm;
      Vmstat_t    vs;
      unsigned int      regions;
      Vmalloc_t*  region[256];
} State_t;

/*
 * sfkeyprintf() lookup
 * handle==0 for heading
 */

static int
key(void* handle, Sffmt_t* fp, const char* arg, char** ps, Sflong_t* pn)
{
      register State_t* state = (State_t*)handle;
      register char*          s;

      if (!(s = fp->t_str) || streq(s, "size"))
            *pn = state->vs.extent;
      else if (streq(s, "region"))
            *pn = integralof(state->vm);
      else if (streq(s, "segments"))
            *pn = state->vs.n_seg;
      else if (streq(s, "busy_size"))
            *pn = state->vs.s_busy;
      else if (streq(s, "busy_blocks"))
            *pn = state->vs.n_busy;
      else if (streq(s, "busy_max"))
            *pn = state->vs.m_busy;
      else if (streq(s, "flags"))
      {
            *ps = s = fmtbuf(32);
            if (state->vs.mode & VM_TRUST)
                  s = strcopy(s, "TRUST|");
            if (state->vs.mode & VM_TRACE)
                  s = strcopy(s, "TRACE|");
            if (state->vs.mode & VM_DBCHECK)
                  s = strcopy(s, "DBCHECK|");
            if (state->vs.mode & VM_DBABORT)
                  s = strcopy(s, "DBABORT|");
            if (s > *ps)
                  *(s - 1) = 0;
            else
                  strcpy(s, "0");
      }
      else if (streq(s, "free_size"))
            *pn = state->vs.s_free;
      else if (streq(s, "free_blocks"))
            *pn = state->vs.n_free;
      else if (streq(s, "free_max"))
            *pn = state->vs.m_free;
      else if (streq(s, "format"))
            *ps = (char*)state->format;
      else if (streq(s, "method"))
      {
            if (state->vs.mode & VM_MTBEST)
                  *ps = "best";
            else if (state->vs.mode & VM_MTPOOL)
                  *ps = "pool";
            else if (state->vs.mode & VM_MTLAST)
                  *ps = "last";
            else if (state->vs.mode & VM_MTDEBUG)
                  *ps = "debug";
            else if (state->vs.mode & VM_MTPROFILE)
                  *ps = "profile";
            else
                  *ps = "UNKNOWN";
      }
      else
      {
            error(2, "%s: unknown format identifier", s);
            return 0;
      }
      return 1;
}

static int
visit(Vmalloc_t* vm, void* addr, size_t size, Vmdisc_t* disc, void* handle)
{
      State_t*    state = (State_t*)handle;
      Vmstat_t    vs;

      if (vm != state->vm)
      {
            state->vm = vm;
            if (state->regions < elementsof(state->region))
                  state->region[state->regions++] = vm;
      }
      return 0;
}

int
b_vmstate(int argc, char** argv, void* context)
{
      register int      i;
      State_t           state;

      memset(&state, 0, sizeof(state));
      cmdinit(argc, argv, context, ERROR_CATALOG, 0);
      for (;;)
      {
            switch (optget(argv, usage))
            {
            case 'f':
                  state.format = opt_info.arg;
                  continue;
            case '?':
                  error(ERROR_USAGE|4, "%s", opt_info.arg);
                  break;
            case ':':
                  error(2, "%s", opt_info.arg);
                  break;
            }
            break;
      }
      argv += opt_info.index;
      if (error_info.errors || *argv)
            error(ERROR_USAGE|4, "%s", optusage(NiL));
      if (!state.format)
            state.format = FORMAT;

      /*
       * the walk must do no allocations because it locks the regions
       */

      vmwalk(NiL, visit, &state);

      /*
       * now we can compute and list the state of each region
       */

      for (i = 0; i < state.regions; i++)
      {
            state.vm = state.region[i];
            vmstat(state.vm, &state.vs);
            sfkeyprintf(sfstdout, &state, state.format, key, NiL);
            sfprintf(sfstdout, "\n");
      }
      return 0;
}

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