/* fotest.c: FAIL-OVER TEST
*
* $Id: //info.ravenbrook.com/project/mps/version/1.115/code/fotest.c#1 $
* Copyright (c) 2001-2014 Ravenbrook Limited. See end of file for license.
* Portions copyright (C) 2002 Global Graphics Software.
*
* This tests fail-over behaviour in low memory situations. The MVFF
* and MVT pool classes normally maintain their list of free blocks in
* a Coalescing Block Structure (CBS), but if the CBS cannot handle a
* request due to running out of memory, they fall back to a Freelist
* (which has zero memory overhead, at some cost in performance).
*
* This is a white box test: it patches the class of the CBS's
* internal block pool (MFS) with a pointer to a dummy class whose
* alloc() method always returns ResMEMORY.
*/
#include "mpscmvff.h"
#include "mpscmvt.h"
#include "mpsavm.h"
#include "testlib.h"
#include "cbs.h"
#include "mpm.h"
#include "mpmst.h"
#include "mpmtypes.h"
#include "poolmfs.h"
#include <stdio.h> /* printf */
#define testArenaSIZE ((((size_t)3)<<24) - 4)
#define testSetSIZE 200
#define testLOOPS 10
/* Accessors for the CBS used to implement a pool. */
extern Land _mps_mvff_cbs(Pool);
extern Land _mps_mvt_cbs(Pool);
/* "OOM" pool class -- dummy alloc/free pool class whose alloc()
* method always fails and whose free method does nothing. */
static Res oomAlloc(Addr *pReturn, Pool pool, Size size)
{
UNUSED(pReturn);
UNUSED(pool);
UNUSED(size);
switch (rnd() % 3) {
case 0:
return ResRESOURCE;
case 1:
return ResMEMORY;
default:
return ResCOMMIT_LIMIT;
}
}
extern PoolClass OOMPoolClassGet(void);
DEFINE_POOL_CLASS(OOMPoolClass, this)
{
INHERIT_CLASS(this, AbstractPoolClass);
this->alloc = oomAlloc;
this->free = PoolTrivFree;
this->size = sizeof(PoolStruct);
AVERT(PoolClass, this);
}
/* make -- allocate one object */
static mps_res_t make(mps_addr_t *p, mps_ap_t ap, size_t size)
{
mps_res_t res;
do {
MPS_RESERVE_BLOCK(res, *p, ap, size);
if(res != MPS_RES_OK)
return res;
} while(!mps_commit(ap, *p, size));
return MPS_RES_OK;
}
/* set_oom -- set blockPool of CBS to OOM or MFS according to argument. */
static void set_oom(Land land, int oom)
{
CBS cbs = PARENT(CBSStruct, landStruct, land);
cbs->blockPool->class = oom ? OOMPoolClassGet() : PoolClassMFS();
}
/* stress -- create an allocation point and allocate in it */
static mps_res_t stress(size_t (*size)(unsigned long, mps_align_t),
mps_align_t alignment, mps_pool_t pool, Land cbs)
{
mps_res_t res = MPS_RES_OK;
mps_ap_t ap;
unsigned long i, k;
int *ps[testSetSIZE];
size_t ss[testSetSIZE];
die(mps_ap_create(&ap, pool, mps_rank_exact()), "BufferCreate");
/* allocate a load of objects */
for (i=0; i<testSetSIZE; ++i) {
ss[i] = (*size)(i, alignment);
res = make((mps_addr_t *)&ps[i], ap, ss[i]);
if (res != MPS_RES_OK)
goto allocFail;
if (ss[i] >= sizeof(ps[i]))
*ps[i] = 1; /* Write something, so it gets swap. */
}
for (k=0; k<testLOOPS; ++k) {
/* shuffle all the objects */
for (i=0; i<testSetSIZE; ++i) {
unsigned long j = rnd()%(testSetSIZE-i);
void *tp;
size_t ts;
tp = ps[j]; ts = ss[j];
ps[j] = ps[i]; ss[j] = ss[i];
ps[i] = tp; ss[i] = ts;
}
/* free half of the objects */
/* upper half, as when allocating them again we want smaller objects */
/* see randomSize() */
for (i=testSetSIZE/2; i<testSetSIZE; ++i) {
mps_free(pool, (mps_addr_t)ps[i], ss[i]);
/* if (i == testSetSIZE/2) */
/* PoolDescribe((Pool)pool, mps_lib_stdout); */
}
/* allocate some new objects */
for (i=testSetSIZE/2; i<testSetSIZE; ++i) {
ss[i] = (*size)(i, alignment);
res = make((mps_addr_t *)&ps[i], ap, ss[i]);
if (res != MPS_RES_OK)
goto allocFail;
}
set_oom(cbs, rnd() % 2);
}
set_oom(cbs, 0);
allocFail:
mps_ap_destroy(ap);
return res;
}
/* randomSizeAligned -- produce sizes both large and small,
* aligned by platform alignment */
static size_t randomSizeAligned(unsigned long i, mps_align_t alignment)
{
size_t maxSize = 2 * 160 * 0x2000;
/* Reduce by a factor of 2 every 10 cycles. Total allocation about 40 MB. */
return alignUp(rnd() % max((maxSize >> (i / 10)), 2) + 1, alignment);
}
int main(int argc, char *argv[])
{
mps_arena_t arena;
mps_pool_t pool;
mps_align_t alignment;
testlib_init(argc, argv);
die(mps_arena_create(&arena, mps_arena_class_vm(), testArenaSIZE),
"mps_arena_create");
alignment = sizeof(void *) << (rnd() % 4);
MPS_ARGS_BEGIN(args) {
MPS_ARGS_ADD(args, MPS_KEY_EXTEND_BY, (64 + rnd() % 64) * 1024);
MPS_ARGS_ADD(args, MPS_KEY_MEAN_SIZE, (1 + rnd() % 8) * 8);
MPS_ARGS_ADD(args, MPS_KEY_ALIGN, alignment);
MPS_ARGS_ADD(args, MPS_KEY_MVFF_ARENA_HIGH, rnd() % 2);
MPS_ARGS_ADD(args, MPS_KEY_MVFF_SLOT_HIGH, rnd() % 2);
MPS_ARGS_ADD(args, MPS_KEY_MVFF_FIRST_FIT, rnd() % 2);
die(mps_pool_create_k(&pool, arena, mps_class_mvff(), args), "create MVFF");
} MPS_ARGS_END(args);
{
die(stress(randomSizeAligned, alignment, pool, _mps_mvff_cbs(pool)),
"stress MVFF");
}
mps_pool_destroy(pool);
mps_arena_destroy(arena);
die(mps_arena_create(&arena, mps_arena_class_vm(), testArenaSIZE),
"mps_arena_create");
alignment = sizeof(void *) << (rnd() % 4);
MPS_ARGS_BEGIN(args) {
MPS_ARGS_ADD(args, MPS_KEY_ALIGN, alignment);
MPS_ARGS_ADD(args, MPS_KEY_MIN_SIZE, (1 + rnd() % 4) * 4);
MPS_ARGS_ADD(args, MPS_KEY_MEAN_SIZE, (1 + rnd() % 8) * 16);
MPS_ARGS_ADD(args, MPS_KEY_MAX_SIZE, (1 + rnd() % 4) * 1024);
MPS_ARGS_ADD(args, MPS_KEY_MVT_RESERVE_DEPTH, (1 + rnd() % 64) * 16);
MPS_ARGS_ADD(args, MPS_KEY_MVT_FRAG_LIMIT, (rnd() % 101) / 100.0);
die(mps_pool_create_k(&pool, arena, mps_class_mvt(), args), "create MVFF");
} MPS_ARGS_END(args);
{
die(stress(randomSizeAligned, alignment, pool, _mps_mvt_cbs(pool)),
"stress MVT");
}
mps_pool_destroy(pool);
mps_arena_destroy(arena);
printf("%s: Conclusion: Failed to find any defects.\n", argv[0]);
return 0;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (c) 2001-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
* All rights reserved. This is an open source license. Contact
* Ravenbrook for commercial licensing options.
*
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* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Redistributions in any form must be accompanied by information on how
* to obtain complete source code for this software and any accompanying
* software that uses this software. The source code must either be
* included in the distribution or be available for no more than the cost
* of distribution plus a nominal fee, and must be freely redistributable
* under reasonable conditions. For an executable file, complete source
* code means the source code for all modules it contains. It does not
* include source code for modules or files that typically accompany the
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*
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