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kernel: Notify low resource handler & retry when low on kernel address space.

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Solves a decade-old TODO. This might help with strange behavior in
low-memory conditions.
This commit is contained in:
Augustin Cavalier
2018-12-11 14:44:52 -05:00
parent 0a347c90d5
commit f1e8678942
1 changed files with 10 additions and 9 deletions
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src/system/kernel/vm/vm.cpp
+10 -9
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@@ -871,16 +871,17 @@ map_backing_store(VMAddressSpace* addressSpace, VMCache* cache, off_t offset,
status = addressSpace->InsertArea(area, size, addressRestrictions,
allocationFlags, _virtualAddress);
if (status != B_OK) {
// TODO: wait and try again once this is working in the backend
#if 0
if (status == B_NO_MEMORY && addressSpec == B_ANY_KERNEL_ADDRESS) {
low_resource(B_KERNEL_RESOURCE_ADDRESS_SPACE, size,
0, 0);
}
#endif
goto err2;
if (status == B_NO_MEMORY
&& addressRestrictions->address_specification == B_ANY_KERNEL_ADDRESS) {
// issue a low resource notification and try again
low_resource(B_KERNEL_RESOURCE_ADDRESS_SPACE, size, B_RELATIVE_TIMEOUT,
((flags & CREATE_AREA_DONT_WAIT) != 0) ? 0 : 100000 /* 100ms*/);
status = addressSpace->InsertArea(area, size, addressRestrictions,
allocationFlags, _virtualAddress);
}
if (status != B_OK)
goto err2;
// attach the cache to the area
area->cache = cache;