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alloc: split slab and slabEntry definition

This commit is contained in:
Mathieu Maret 2019-04-16 23:12:16 +02:00
parent f2b0edc5a3
commit b3d38d8c9c
3 changed files with 95 additions and 43 deletions
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120
core/alloc.c
View File

@ -13,7 +13,7 @@
struct slabDesc *slub; struct slabDesc *slub;
int addSlab(struct slabDesc **desc, size_t size, int self_containing); int addSlab(struct slabDesc **desc, size_t size, int self_containing);
static int formatPage(struct slabDesc *desc, size_t size, int selfContained); static int formatPage(struct slabEntry *desc, size_t size, int selfContained);
int allocInit(void) int allocInit(void)
{ {
@ -21,7 +21,11 @@ int allocInit(void)
list_init(slub); list_init(slub);
int ret; int ret;
if ((ret = allocBookSlab(sizeof(struct slabDesc), 1))) { if ((ret = allocBookSlab(sizeof(struct slabDesc), 1))) {
pr_devel("Fail to allocBookSlab %d for slabDesc :( \n"); pr_devel("Fail to allocBookSlab %d for slabDesc :( \n", ret);
return ret;
}
if ((ret = allocBookSlab(sizeof(struct slabEntry), 1))) {
pr_devel("Fail to allocBookSlab %d for slabEntry :( \n", ret);
return ret; return ret;
} }
for (uint i = start; i <= SLUB_SIZE; i++) { for (uint i = start; i <= SLUB_SIZE; i++) {
@ -35,29 +39,59 @@ int allocInit(void)
int allocBookSlab(size_t size, int selfContained) int allocBookSlab(size_t size, int selfContained)
{ {
// pr_devel("%s for size %d is self %d\n", __func__, size, selfContained ); pr_devel("%s for size %d is self %d\n", __func__, size, selfContained);
struct slabDesc *slabEntry; struct slabDesc *slab = NULL;
struct slabDesc *slab;
int slabIdx; int slabIdx;
int ret; int ret;
if ((ret = addSlab(&slabEntry, size, selfContained)))
return ret;
list_foreach(slub, slab, slabIdx) list_foreach(slub, slab, slabIdx)
{ {
if (slab->size == size) { if (slab->size == size) {
pr_devel("Slab already exist");
return -EEXIST; return -EEXIST;
} }
if (slab->size > size) { if (slab->size > size) {
list_insert_before(slub, slab, slabEntry); break;
return 0;
} }
} }
list_add_tail(slub, slabEntry); struct slabDesc *newSlab;
if ((ret = addSlab(&newSlab, size, selfContained)))
return ret;
if (list_foreach_early_break(slub, slab, slabIdx)) {
list_insert_before(slub, slab, newSlab);
} else {
list_add_tail(slub, newSlab);
}
return 0; return 0;
} }
int addSlab(struct slabDesc **desc, size_t size, int selfContained) int addSlab(struct slabDesc **desc, size_t size, int selfContained)
{
// pr_devel("%s for size %d is self %d\n", __func__, size, selfContained);
if (size > PAGE_SIZE)
return -ENOENT;
paddr_t alloc = allocPhyPage();
if (alloc == (paddr_t)NULL)
return -ENOMEM;
if (pageMap((vaddr_t)alloc, alloc, PAGING_MEM_WRITE))
return -ENOMEM;
if (selfContained) {
*desc = (struct slabDesc *)alloc;
((*desc)->slab).freeEl = (char *)(*desc) + sizeof(struct slabDesc);
} else {
*desc = malloc(sizeof(struct slabDesc));
(*desc)->slab.freeEl = (void *)alloc;
}
struct slabEntry *slab = &(*desc)->slab;
list_singleton(slab, slab);
slab->page = (vaddr_t)alloc;
slab->full = 0;
slab->size = size;
(*desc)->size = size;
// pr_devel("got page %d for size %d first %d", alloc, size, (*desc)->slab.freeEl);
return formatPage(&(*desc)->slab, size, selfContained);
}
int addSlabEntry(struct slabEntry **desc, size_t size, int selfContained)
{ {
pr_devel("%s for size %d is self %d\n", __func__, size, selfContained); pr_devel("%s for size %d is self %d\n", __func__, size, selfContained);
if (size > PAGE_SIZE) if (size > PAGE_SIZE)
@ -69,21 +103,21 @@ int addSlab(struct slabDesc **desc, size_t size, int selfContained)
return -ENOMEM; return -ENOMEM;
if (selfContained) { if (selfContained) {
*desc = (struct slabDesc *)alloc; *desc = (struct slabEntry *)alloc;
(*desc)->freeEl = (char *)(*desc) + sizeof(struct slabDesc); (*desc)->freeEl = (char *)(*desc) + sizeof(struct slabEntry);
} else { } else {
*desc = malloc(sizeof(struct slabDesc)); *desc = malloc(sizeof(struct slabEntry));
(*desc)->freeEl = (void *)alloc; (*desc)->freeEl = (void *)alloc;
} }
list_singleton(*desc, *desc); list_singleton(*desc, *desc);
(*desc)->page = (vaddr_t)alloc; (*desc)->page = (vaddr_t)alloc;
(*desc)->full = 0; (*desc)->full = 0;
(*desc)->size = size; (*desc)->size = size;
pr_devel("got page %d for size %d first %d", alloc, size, (*desc)->freeEl); // pr_devel("got page %d for size %d first %d", alloc, size, (*desc)->freeEl);
return formatPage((*desc), size, selfContained); return formatPage((*desc), size, selfContained);
} }
static int formatPage(struct slabDesc *desc, size_t size, int selfContained) static int formatPage(struct slabEntry *desc, size_t size, int selfContained)
{ {
char *cur = desc->freeEl; char *cur = desc->freeEl;
ulong nbEl = PAGE_SIZE / size - 1; ulong nbEl = PAGE_SIZE / size - 1;
@ -95,11 +129,11 @@ static int formatPage(struct slabDesc *desc, size_t size, int selfContained)
cur += size; cur += size;
} }
*((vaddr_t *)cur) = (vaddr_t)NULL; *((vaddr_t *)cur) = (vaddr_t)NULL;
pr_devel("last at %d allocated %d\n", cur, i + 1); // pr_devel("last at %d allocated %d\n", cur, i + 1);
return 0; return 0;
} }
static void *allocFromSlab(struct slabDesc *slab) static void *allocFromSlab(struct slabEntry *slab)
{ {
vaddr_t *next = slab->freeEl; vaddr_t *next = slab->freeEl;
if (*next == (vaddr_t)NULL) { if (*next == (vaddr_t)NULL) {
@ -117,49 +151,46 @@ void *malloc(size_t size)
printf("implement malloc for big size\n"); printf("implement malloc for big size\n");
return NULL; return NULL;
} }
struct slabDesc *slubEntry; struct slabDesc *slab;
uint slubIdx; uint slubIdx;
list_foreach(slub, slubEntry, slubIdx) list_foreach(slub, slab, slubIdx)
{ {
if (size <= slubEntry->size) if (size <= slab->size)
break; break;
} }
struct slabDesc *slab; struct slabEntry *slabEntry;
int slabIdx; int slabIdx;
list_foreach(slubEntry, slab, slabIdx) list_foreach(&slab->slab, slabEntry, slabIdx)
{ {
if (slab->size > slubEntry->size){ if (!slabEntry->full) {
pr_devel("No more room in slub %d\n", slubIdx); // pr_devel("found place in slub %d at idx %d for size %d\n", slubIdx,
break; // slabIdx, size);
} return allocFromSlab(slabEntry);
if (!slab->full) {
pr_devel("found place in slub %d at idx %d for size %d\n", slubIdx,
slabIdx, size);
return allocFromSlab(slab);
} }
} }
// No room found // No room found
struct slabDesc *newSlab; struct slabEntry *newSlabEntry;
struct slabEntry *slabList = &slab->slab;
int ret; int ret;
if ((ret = addSlab(&newSlab, slubEntry->size, IS_SELF_CONTAINED(slubEntry)))) { if ((ret = addSlabEntry(&newSlabEntry, slab->size, IS_SELF_CONTAINED(&slab->slab)))) {
pr_devel("Fail to addSlab %d\n", ret); pr_devel("Fail to addSlabEntry %d\n", ret);
return NULL; return NULL;
} }
pr_devel("Allocate new slab for object of size %d\n", slubEntry->size); pr_devel("Allocate new slab for object of size %d\n", slab->size);
list_add_head(slubEntry, newSlab); list_add_tail(slabList, newSlabEntry);
return allocFromSlab(newSlab); return allocFromSlab(newSlabEntry);
} }
int slabFree(void *ptr, struct slabDesc *slab) int slabFree(void *ptr, struct slabEntry *slab)
{ {
struct slabDesc *slabEntry; struct slabEntry *slabEntry;
int slabIdx; int slabIdx;
list_foreach(slab, slabEntry, slabIdx) list_foreach(slab, slabEntry, slabIdx)
{ {
if ((slabEntry->page <= (vaddr_t)ptr) && if ((slabEntry->page <= (vaddr_t)ptr) &&
((vaddr_t)ptr < (slabEntry->page + PAGE_SIZE))) { ((vaddr_t)ptr < (slabEntry->page + PAGE_SIZE))) {
pr_devel("free place! was %d is now %d\n", slabEntry->freeEl, ptr); // pr_devel("free place! was %d is now %d\n", slabEntry->freeEl, ptr);
*((vaddr_t *)ptr) = (vaddr_t)slabEntry->freeEl; *((vaddr_t *)ptr) = (vaddr_t)slabEntry->freeEl;
slabEntry->freeEl = ptr; slabEntry->freeEl = ptr;
slabEntry->full = 0; slabEntry->full = 0;
@ -177,8 +208,13 @@ void free(void *ptr)
int slabIdx; int slabIdx;
list_foreach(slub, slab, slabIdx) list_foreach(slub, slab, slabIdx)
{ {
if (slabFree(ptr, slab)) struct slabEntry *slabEntry;
return; int entryIdx;
list_foreach(&slab->slab, slabEntry, entryIdx)
{
if (slabFree(ptr, slabEntry))
return;
}
} }
pr_devel("free: slab not found\n"); pr_devel("free: slab not found\n");
} }

9
core/alloc.h
View File

@ -2,11 +2,18 @@
#include "paging.h" #include "paging.h"
#include "stdarg.h" #include "stdarg.h"
struct slabDesc { struct slabEntry {
vaddr_t page; vaddr_t page;
size_t size; size_t size;
void *freeEl; void *freeEl;
char full; char full;
struct slabEntry *next;
struct slabEntry *prev;
};
struct slabDesc {
struct slabEntry slab;
size_t size;
struct slabDesc *next; struct slabDesc *next;
struct slabDesc *prev; struct slabDesc *prev;
}; };

9
tests/test.c
View File

@ -40,6 +40,12 @@ void testPhymem(void)
static void testAlloc(void) static void testAlloc(void)
{ {
for( uint i = 0; i < PAGE_SIZE/(sizeof(struct slabEntry)); i++){
malloc(sizeof(struct slabEntry));
}
for( uint i = 0; i < PAGE_SIZE/(sizeof(struct slabDesc)); i++){
malloc(sizeof(struct slabDesc));
}
assert(malloc(1)); assert(malloc(1));
assert(malloc(2)); assert(malloc(2));
assert(malloc(3)); assert(malloc(3));
@ -55,6 +61,9 @@ static void testAlloc(void)
assert(malloc(1024)); assert(malloc(1024));
assert(malloc(1024)); assert(malloc(1024));
assert(malloc(1024)); assert(malloc(1024));
assert(malloc(1024));
assert(malloc(2048));
//assert(malloc(4096));
} }
static void testPaging(void) static void testPaging(void)