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pmm: list tails and better standby page handling

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Matheus
2024-06-16 12:02:19 -03:00
parent e333908292
commit a524d9b48b
1 changed files with 11 additions and 2 deletions
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kernel-src/mm/pmm.c
+11 -2
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@@ -14,7 +14,9 @@ size_t freepagecount;
static mutex_t freelistmutex; static mutex_t freelistmutex;
static page_t *freelists[PMM_SECTION_COUNT]; static page_t *freelists[PMM_SECTION_COUNT];
static page_t *freetails[PMM_SECTION_COUNT];
static page_t *standbylists[PMM_SECTION_COUNT]; static page_t *standbylists[PMM_SECTION_COUNT];
static page_t *standbytails[PMM_SECTION_COUNT];
typedef struct { typedef struct {
uintmax_t baseid; uintmax_t baseid;
@@ -51,6 +53,7 @@ static void insertinfreelist(page_t *page) {
uintmax_t pageid = PAGE_GETID(page); uintmax_t pageid = PAGE_GETID(page);
PAGE_BOUNDARYCHECK(pageid); PAGE_BOUNDARYCHECK(pageid);
struct page_t **list; struct page_t **list;
struct page_t **tail;
int section; int section;
@@ -62,6 +65,7 @@ static void insertinfreelist(page_t *page) {
section = PMM_SECTION_DEFAULT; section = PMM_SECTION_DEFAULT;
list = page->backing ? &standbylists[section] : &freelists[section]; list = page->backing ? &standbylists[section] : &freelists[section];
tail = page->backing ? &standbytails[section] : &freetails[section];
if (sections[section].searchstart > pageid) if (sections[section].searchstart > pageid)
sections[section].searchstart = pageid; sections[section].searchstart = pageid;
@@ -71,6 +75,8 @@ static void insertinfreelist(page_t *page) {
*list = page; *list = page;
if (page->freenext) if (page->freenext)
page->freenext->freeprev = page; page->freenext->freeprev = page;
else
*tail = page;
++freepagecount; ++freepagecount;
} }
@@ -79,6 +85,7 @@ static void removefromfreelist(page_t *page) {
uintmax_t pageid = PAGE_GETID(page); uintmax_t pageid = PAGE_GETID(page);
PAGE_BOUNDARYCHECK(pageid); PAGE_BOUNDARYCHECK(pageid);
struct page_t **list; struct page_t **list;
struct page_t **tail;
int section; int section;
@@ -90,6 +97,7 @@ static void removefromfreelist(page_t *page) {
section = PMM_SECTION_DEFAULT; section = PMM_SECTION_DEFAULT;
list = page->backing ? &standbylists[section] : &freelists[section]; list = page->backing ? &standbylists[section] : &freelists[section];
tail = page->backing ? &standbytails[section] : &freetails[section];
if (page->freeprev) if (page->freeprev)
page->freeprev->freenext = page->freenext; page->freeprev->freenext = page->freenext;
@@ -98,6 +106,8 @@ static void removefromfreelist(page_t *page) {
if (page->freenext) if (page->freenext)
page->freenext->freeprev = page->freeprev; page->freenext->freeprev = page->freeprev;
else
*tail = page->freeprev;
--freepagecount; --freepagecount;
} }
@@ -165,10 +175,9 @@ void *pmm_allocpage(int section) {
bool cachepage = false; bool cachepage = false;
// if that wasn't possible, try to take from the cache standby list // if that wasn't possible, try to take from the cache standby list
// TODO do this FIFO rather than LIFO
if (page == NULL) { if (page == NULL) {
for (int i = section; i >= 0; --i) { for (int i = section; i >= 0; --i) {
page = standbylists[i]; page = standbytails[i];
if (page) { if (page) {
cachepage = true; cachepage = true;
internalhold(page); internalhold(page);