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vm: allocate wrappers on the heap with small stack array fallback

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see comments on #10169. Thanks Ingo for reviewing!
This commit is contained in:
Jérôme Duval
2013-11-11 18:34:14 +01:00
parent c93efdb37f
commit e94bffa072
1 changed files with 13 additions and 7 deletions
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src/system/kernel/vm/vm_page.cpp
+12 -6
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@@ -3070,18 +3070,22 @@ vm_page_write_modified_page_range(struct VMCache* cache, uint32 firstPage,
const uint32 allocationFlags = HEAP_DONT_WAIT_FOR_MEMORY
| HEAP_DONT_LOCK_KERNEL_SPACE;
PageWriteWrapper stackWrappers[2];
PageWriteWrapper stackWrappersPool[2];
PageWriteWrapper* stackWrappers[1];
PageWriteWrapper* wrapperPool
= new(malloc_flags(allocationFlags)) PageWriteWrapper[maxPages + 1];
if (wrapperPool == NULL) {
PageWriteWrapper** wrappers
= new(malloc_flags(allocationFlags)) PageWriteWrapper*[maxPages];
if (wrapperPool == NULL || wrappers == NULL) {
// don't fail, just limit our capabilities
wrapperPool = stackWrappers;
free(wrapperPool);
free(wrappers);
wrapperPool = stackWrappersPool;
wrappers = stackWrappers;
maxPages = 1;
}
int32 nextWrapper = 0;
PageWriteWrapper* wrappers[maxPages];
int32 usedWrappers = 0;
PageWriteTransfer transfer;
@@ -3151,8 +3155,10 @@ vm_page_write_modified_page_range(struct VMCache* cache, uint32 firstPage,
transferEmpty = true;
}
if (wrapperPool != stackWrappers)
if (wrapperPool != stackWrappersPool) {
delete[] wrapperPool;
delete[] wrappers;
}
return B_OK;
}