mirrors/Astral
1
0
Fork 0
mirror of https://github.com/Mathewnd/Astral.git synced 2026-10-27 20:58:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

vmmcache: vmmcache_evict

Browse Source
This commit is contained in:
Matheus
2024-05-26 15:30:14 -03:00
parent 858b7a35ff
commit 171fde1574
2 changed files with 30 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel-src/mm/vmmcache.c
+27
View File
@@ -13,6 +13,7 @@ static page_t **table;
static thread_t *writerthread;
static semaphore_t sync;
static pollheader_t syncpollheader;
size_t vmmcache_cachedpages;
#define HOLD_LOCK() \
MUTEX_ACQUIRE(&mutex, false);
@@ -66,6 +67,7 @@ static void putpage(page_t *page) {
page->backing->pages->vnodeprev = page;
page->backing->pages = page;
++vmmcache_cachedpages;
}
// assumes lock is held
@@ -95,6 +97,7 @@ static void removepage(page_t *page) {
page->vnodenext = NULL;
page->vnodeprev = NULL;
--vmmcache_cachedpages;
}
int vmmcache_getpage(vnode_t *vnode, uintmax_t offset, page_t **res) {
@@ -178,6 +181,30 @@ int vmmcache_getpage(vnode_t *vnode, uintmax_t offset, page_t **res) {
return 0;
}
// removes a page from the cache AND turns it into anonymous memory
int vmmcache_evict(page_t *page) {
HOLD_LOCK();
if (page->refcount > 1) {
RELEASE_LOCK();
return EAGAIN;
}
__assert(page->refcount == 1);
__assert((page->flags & PAGE_FLAGS_DIRTY) == 0);
if ((page->flags & PAGE_FLAGS_TRUNCATED) == 0) {
// the page needs to be removed from the cache to continue
removepage(page);
}
page->flags = 0;
page->backing = NULL;
page->offset = 0;
RELEASE_LOCK();
return 0;
}
// removes a page from the cache *but doesn't do anything to it*
int vmmcache_takepage(page_t *page) {
HOLD_LOCK();
// someone called vmmcache_getpage() and got this page while the lock wasn't held