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kernel/vm: Handle overcommitting areas in cut_area properly.

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We shouldn't adjust their commitments directly.
This commit is contained in:
Augustin Cavalier
2024-12-13 18:05:26 -05:00
parent 038d9b44d1
commit 5cfac6e80f
1 changed files with 11 additions and 8 deletions
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src/system/kernel/vm/vm.cpp
+11 -8
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@@ -768,7 +768,8 @@ cut_area(VMAddressSpace* addressSpace, VMArea* area, addr_t address,
}
int resizePriority = priority;
if (area->page_protections != NULL) {
const bool overcommitting = (area->protection & B_OVERCOMMITTING_AREA) != 0;
if (area->page_protections != NULL && !overcommitting) {
// We'll adjust commitments directly, rather than letting VMCache do it.
resizePriority = -1;
}
@@ -867,7 +868,7 @@ cut_area(VMAddressSpace* addressSpace, VMArea* area, addr_t address,
}
area->cache_offset += size;
if (area->page_protections != NULL) {
if (area->page_protections != NULL && !overcommitting) {
const size_t newCommitmentPages = compute_area_page_commitment(area);
cache->Commit(newCommitmentPages * B_PAGE_SIZE, priority);
}
@@ -923,7 +924,7 @@ cut_area(VMAddressSpace* addressSpace, VMArea* area, addr_t address,
// Create a new cache for the second area.
VMCache* secondCache;
error = VMCacheFactory::CreateAnonymousCache(secondCache,
area->protection & B_OVERCOMMITTING_AREA, 0, 0,
overcommitting, 0, 0,
dynamic_cast<VMAnonymousNoSwapCache*>(cache) == NULL, priority);
if (error != B_OK) {
addressSpace->ShrinkAreaTail(area, oldSize, allocationFlags);
@@ -1026,12 +1027,14 @@ cut_area(VMAddressSpace* addressSpace, VMArea* area, addr_t address,
// We don't need this anymore.
free_etc(areaOldProtections, allocationFlags);
// Shrink commitments.
const size_t areaCommitPages = compute_area_page_commitment(area);
area->cache->Commit(areaCommitPages * B_PAGE_SIZE, priority);
if (!overcommitting) {
// Shrink commitments.
const size_t areaCommitPages = compute_area_page_commitment(area);
area->cache->Commit(areaCommitPages * B_PAGE_SIZE, priority);
const size_t secondCommitPages = compute_area_page_commitment(secondArea);
secondArea->cache->Commit(secondCommitPages * B_PAGE_SIZE, priority);
const size_t secondCommitPages = compute_area_page_commitment(secondArea);
secondArea->cache->Commit(secondCommitPages * B_PAGE_SIZE, priority);
}
// Set the correct page protections for the second area.
VMTranslationMap* map = addressSpace->TranslationMap();