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[zone] Revert cache behavior to its original design

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My reason for using Hunk_HighAlloc for allocating cache blocks was to
lock them down so they were safe for the sound mixer to access when
running in a real-time thread. However, I had never tested under tight
memory constraints, which proved that the design (or maybe just
implementation) just wasn't robust. However, now that sounds are loaded
into a completely separate region, it's safe to put the cache back to
its original behaviour (still with 64-byte alignment and such, of
course). This will even allow the high hunk to be used again, though it
effectively was anyway with Hunk_TempAlloc.
This commit is contained in:
Bill Currie 2022-06-06 13:25:43 +09:00
parent 5fa73e7ff2
commit 5c94c40985
1 changed files with 182 additions and 161 deletions
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343
libs/util/zone.c
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@ -37,6 +37,7 @@
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include "QF/cmd.h"
#include "QF/cvar.h"
@ -48,7 +49,8 @@
#include "compat.h"
static void Cache_FreeLow (memhunk_t *hunk, int new_low_hunk);
static void Cache_FreeLow (memhunk_t *hunk, size_t new_low_hunk);
static void Cache_FreeHigh (memhunk_t *hunk, size_t new_high_hunk);
static void Cache_Profile_r (memhunk_t *hunk);
static qboolean Cache_FreeLRU (memhunk_t *hunk);
@ -537,6 +539,51 @@ cs_ind (memhunk_t *hunk, cache_system_t *cs_ptr)
static memhunk_t *global_hunk;
static int
hunk_check (memhunk_t *hunk, hunkblk_t *h, int err)
{
const char *msg = 0;
if (h->sentinal1 != HUNK_SENTINAL || h->sentinal2 != HUNK_SENTINAL) {
msg = "Hunk_Check: trashed sentinel";
}
if (!msg && (h->size < sizeof (hunkblk_t)
|| h->size + (byte *) h > hunk->base + hunk->size)) {
msg = "Hunk_Check: bad size";
}
if (!msg) {
return 1;
}
byte *buf = (byte *) h;
int len = sizeof (*h);
int pos = 0, llen, i;
fflush (stdout);
fprintf (stderr, "\n");
while (pos < len) {
llen = (len - pos < 16 ? len - pos : 16);
fprintf (stderr, "%08x: ", pos);
for (i = 0; i < llen; i++)
fprintf (stderr, "%02x ", buf[pos + i]);
for (i = 0; i < 16 - llen; i++)
fprintf (stderr, " ");
fprintf (stderr, " | ");
for (i = 0; i < llen; i++)
fprintf (stderr, "%c", isprint (buf[pos + i]) ? buf[pos + i] : '.');
for (i = 0; i < 16 - llen; i++)
fprintf (stderr, " ");
fprintf (stderr, "\n");
pos += llen;
}
if (err) {
Sys_Error ("%p: %zd: %s", h, (byte *) h - (byte *) hunk, msg);
}
fprintf (stderr, "%p: %zd: %s", h, (byte *) h - (byte *) hunk, msg);
return 0;
}
/*
Hunk_Check
@ -550,11 +597,7 @@ Hunk_Check (memhunk_t *hunk)
byte *hunk_end = hunk->base + hunk->low_used;
for (h = (hunkblk_t *) hunk->base; (byte *) h < hunk_end; ) {
if (h->sentinal1 != HUNK_SENTINAL || h->sentinal2 != HUNK_SENTINAL)
Sys_Error ("Hunk_Check: trashed sentinal");
if (h->size < sizeof (hunkblk_t)
|| h->size + (byte *) h > hunk->base + hunk->size)
Sys_Error ("Hunk_Check: bad size");
hunk_check (hunk, h, 1);
h = (hunkblk_t *) ((byte *) h + h->size);
}
}
@ -600,11 +643,9 @@ Hunk_Print (memhunk_t *hunk, qboolean all)
break;
// run consistancy checks
if (h->sentinal1 != HUNK_SENTINAL || h->sentinal2 != HUNK_SENTINAL)
Sys_Error ("Hunk_Check: trahsed sentinal");
if (h->size < (int) sizeof (hunkblk_t)
|| h->size + (byte *) h > hunk->base + hunk->size)
Sys_Error ("Hunk_Check: bad size");
if (!hunk_check (hunk, h, 0)) {
break;
}
next = (hunkblk_t *) ((byte *) h + h->size);
count++;
@ -776,6 +817,7 @@ Hunk_HighAlloc (memhunk_t *hunk, size_t size)
}
hunk->high_used += size;
Cache_FreeHigh (hunk, hunk->high_used);
h = (void *) (hunk->base + hunk->size - hunk->high_used);
h->sentinal1 = HUNK_SENTINAL;
@ -843,74 +885,6 @@ Hunk_PointerIsValid (memhunk_t *hunk, void *ptr)
/* CACHE MEMORY */
static cache_system_t *Cache_TryAlloc (memhunk_t *hunk, size_t size,
qboolean nobottom);
#if 0
static void
check_cache (void)
{
cache_system_t *cs;
int used = hunk_tempactive ? hunk_tempmark : hunk_high_used;
for (cs = cache_head.prev; cs != &cache_head; cs = cs->prev)
if (cs->prev != &cache_head) {
if ((byte *) cs + cs->size != (byte *) cs->prev)
Sys_Error ("inconsistent cache %p %p %d %d", cs, cs->prev,
(int)cs->size,
(int) ((char *)cs->prev - (char *)cs));
if (hunk_size - ((byte*)cs - hunk_base) > used)
Sys_Error ("cache block out of high hunk");
}
if (cache_head.prev != &cache_head &&
hunk_size - ((byte*) cache_head.prev - hunk_base) != used)
Sys_Error ("cache bottom not at bottom of high hunk");
}
#endif
static void
Cache_Move (cache_system_t *c)
{
memhunk_t *hunk = c->hunk;
cache_system_t *new;
// we are clearing up space at the bottom, so allocate it late
new = Cache_TryAlloc (hunk, c->size, true);
if (new) {
Sys_MaskPrintf (SYS_cache, "cache_move ok\n");
memcpy (new + 1, c + 1, c->size - sizeof (cache_system_t));
new->user = c->user;
memccpy (new->name, c->name, 0, sizeof (new->name));
Cache_Free (c->user);
new->user->data = (void *) (new + 1);
} else {
Sys_MaskPrintf (SYS_cache, "cache_move failed\n");
Cache_Free (c->user); // tough luck...
}
}
/*
Cache_FreeLow
Throw things out until the hunk can be expanded to the given point
*/
static void
Cache_FreeLow (memhunk_t *hunk, int new_low_hunk)
{
cache_system_t *c;
while (1) {
c = cs_ptr (hunk, hunk->cache_head[0].prev);
if (c == hunk->cache_head)
return; // nothing in cache at all
if ((byte *) c >= hunk->base + new_low_hunk)
return; // there is space to grow the hunk
Sys_Error ("FIXME: Cache_FreeLow: not enough memory");
Cache_Move (c); // reclaim the space
}
}
static inline void
Cache_UnlinkLRU (cache_system_t * cs)
{
@ -932,22 +906,6 @@ Cache_MakeLRU (cache_system_t * cs)
hunk->cache_head[0].lru_next = cs_ind (hunk, cs);
}
static qboolean
Cache_FreeLRU (memhunk_t *hunk)
{
cache_system_t *cs;
//check_cache ();
for (cs = cs_ptr (hunk, hunk->cache_head[0].lru_prev);
cs != hunk->cache_head && cs->readlock;
cs = cs_ptr (hunk, cs->lru_prev)) {
}
if (cs == hunk->cache_head)
return 0;
Cache_Free (cs->user);
return 1;
}
static void
link_cache_system (cache_system_t *new, cache_system_t *cs)
{
@ -956,7 +914,6 @@ link_cache_system (cache_system_t *new, cache_system_t *cs)
new->prev = cs->prev;
cs_ptr (hunk, cs->prev)->next = cs_ind (hunk, new);
cs->prev = cs_ind (hunk, new);
}
/*
@ -966,16 +923,23 @@ link_cache_system (cache_system_t *new, cache_system_t *cs)
Size should already include the header and padding
*/
static cache_system_t *
Cache_TryAlloc (memhunk_t *hunk, size_t size, qboolean nobottom)
Cache_TryAlloc (memhunk_t *hunk, size_t size,
size_t low_space, size_t high_space)
{
cache_system_t *cs, *new;
//check_cache ();
// is the cache completely empty?
if (!nobottom && hunk->cache_head[0].prev == 0) {
new = (cache_system_t *) Hunk_HighAlloc (hunk, size);
if (!new)
low_space = max (low_space, hunk->low_used);
high_space = max (high_space, hunk->high_used);
if (hunk->cache_head[0].prev == 0) {
// The cache is completely empty, so just check for space
if (hunk->size - high_space < low_space + size) {
return 0;
}
// cache memory comes from the free region of the hunk. Should either
// end of the hunk need to grow, interfering cache blocks will be
// either moved or freed if there is nowhere to move the block.
new = (cache_system_t *) (hunk->base + hunk->low_used);
new->size = size;
new->hunk = hunk;
hunk->cache_head[0].prev = cs_ind (hunk, new);
@ -984,55 +948,132 @@ Cache_TryAlloc (memhunk_t *hunk, size_t size, qboolean nobottom)
new->readlock = 0;
new->name[0] = 0;
Cache_MakeLRU (new);
//check_cache ();
return new;
}
// search for space in existing cache
for (cs = cs_ptr (hunk, hunk->cache_head[0].next);
cs != hunk->cache_head;
cs = cs_ptr (hunk, cs->next)) {
if (cs->user)
continue; // block isn't free
if (cs->size >= size) {
// found a big enough free block. If possible, carve it up for
// later reuse, using the upper portion of the block for the
// newly allocated block.
new = cs;
if (size - cs->size >= sizeof (cache_system_t)) {
new = (cache_system_t *) ((char *) cs + cs->size - size);
new->readlock = 0;
new->name[0] = 0;
new->size = size;
new->hunk = hunk;
cs->size -= size;
link_cache_system (new, cs);
//check_cache ();
}
new = (cache_system_t *) (hunk->base + low_space);
uint32_t csi = hunk->cache_head[0].next;
do {
cs = cs_ptr (hunk, csi);
if ((byte *) cs >= (byte *) new + size) {
new->size = size;
new->hunk = hunk;
link_cache_system (new, cs);
new->readlock = 0;
new->name[0] = 0;
Cache_MakeLRU (new);
return new;
}
// try next block. If it is a hole, then the resulting cs will be
// greater than new (though possibly not sufficiently so), but if
// it's not a hole, then they'll be the same and the difference in
// the test above will be 0
new = (cache_system_t *) ((byte *) cs + cs->size);
csi = cs->next;
} while (csi);
// came to the end of the cache. try to allocate from between the cache
// and the high hunk
if ((byte *) new < hunk->base + low_space) {
new = (cache_system_t *) (hunk->base + low_space);
}
if (nobottom)
return 0;
// didn't find a free block, so make a new one.
new = Hunk_HighAlloc (hunk, size);
if (new) {
new->readlock = 0;
new->name[0] = 0;
if (hunk->base + hunk->size - high_space >= (byte *) new + size) {
new->size = size;
new->hunk = hunk;
link_cache_system (new, hunk->cache_head);
new->readlock = 0;
new->name[0] = 0;
Cache_MakeLRU (new);
//check_cache ();
return new;
}
return 0; // couldn't allocate
}
static void
Cache_Move (cache_system_t *c, size_t new_low_hunk, size_t new_high_hunk)
{
memhunk_t *hunk = c->hunk;
cache_system_t *new;
new = Cache_TryAlloc (hunk, c->size, new_low_hunk, new_high_hunk);
if (new) {
Sys_MaskPrintf (SYS_cache, "cache_move ok\n");
memcpy (new + 1, c + 1, c->size - sizeof (cache_system_t));
new->user = c->user;
memccpy (new->name, c->name, 0, sizeof (new->name));
Cache_Free (c->user);
new->user->data = (void *) (new + 1);
} else {
Sys_MaskPrintf (SYS_cache, "cache_move failed\n");
Cache_Free (c->user); // tough luck...
}
}
/*
Cache_FreeLow
Throw things out until the hunk can be expanded to the given point
*/
static void
Cache_FreeLow (memhunk_t *hunk, size_t new_low_hunk)
{
cache_system_t *c;
uint32_t ci;
// if next is 0, then there is nothing in the cache
while ((ci = hunk->cache_head[0].next)) {
c = cs_ptr (hunk, ci);
if ((byte *) c >= hunk->base + new_low_hunk) {
// there is space to grow the hunk
return;
}
// reclaim the space (the block will be moved or freed)
Cache_Move (c, new_low_hunk, 0);
}
}
static void
Cache_FreeHigh (memhunk_t *hunk, size_t new_high_hunk)
{
cache_system_t *c;
uint32_t ci;
while ((ci = hunk->cache_head[0].prev)) {
c = cs_ptr (hunk, ci);
if ((byte *) c + c->size <= hunk->base + hunk->size - new_high_hunk) {
// there is space to grow the hunk
return;
}
// reclaim the space (the block will be moved or freed)
Cache_Move (c, 0, new_high_hunk);
}
}
static qboolean
Cache_FreeLRU (memhunk_t *hunk)
{
cache_system_t *cs;
for (cs = cs_ptr (hunk, hunk->cache_head[0].lru_prev);
cs != hunk->cache_head && cs->readlock;
cs = cs_ptr (hunk, cs->lru_prev)) {
}
if (cs == hunk->cache_head)
return 0;
Cache_Free (cs->user);
return 1;
}
static void
Cache_Profile_r (memhunk_t *hunk)
{
@ -1180,35 +1221,15 @@ Cache_Free (cache_user_t *c)
Sys_MaskPrintf (SYS_cache, "Cache_Free: freeing '%.*s' %p\n",
sz, cs->name, cs);
Cache_UnlinkLRU (cs);
memhunk_t *hunk = cs->hunk;
memhunk_t *h = cs->hunk;
//check_cache ();
cs->user = 0;
if (!cs_ptr (h, cs->prev)->user) {
cs->size += cs_ptr (h, cs->prev)->size;
cs_ptr (h, cs_ptr (h, cs->prev)->prev)->next = cs_ind (h, cs);
cs->prev = cs_ptr (h, cs->prev)->prev;
}
if (!cs_ptr (h, cs->next)->user) {
cs = cs_ptr (h, cs->next);
cs->size += cs_ptr (h, cs->prev)->size;
cs_ptr (h, cs_ptr (h, cs->prev)->prev)->next = cs_ind (h, cs);
cs->prev = cs_ptr (h, cs->prev)->prev;
}
if (!cs->next) {
cs_ptr (h, cs->next)->prev = cs->prev;
cs_ptr (h, cs->prev)->next = cs->next;
if (cs->prev) {
__auto_type ptr = (byte *) cs_ptr (h, cs->prev);
Hunk_FreeToHighMark (h, h->size - (ptr - h->base));
} else {
Hunk_FreeToHighMark (h, 0);
}
}
//check_cache ();
cs_ptr (hunk, cs->prev)->next = cs->next;
cs_ptr (hunk, cs->next)->prev = cs->prev;
cs->next = cs->prev = 0;
c->data = NULL;
Cache_UnlinkLRU (cs);
}
static void *
@ -1226,7 +1247,7 @@ Cache_Alloc_r (memhunk_t *hunk, cache_user_t *c, size_t size, const char *name)
// find memory for it
while (1) {
cs = Cache_TryAlloc (hunk, size, false);
cs = Cache_TryAlloc (hunk, size, 0, 0);
if (cs) {
memccpy (cs->name, name, 0, sizeof (cs->name));
c->data = (void *) (cs + 1);