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kernel/low_resource_manager: Actually set the low-resource state based on parameters.

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This resolves a TODO, and allows B_KERNEL_RESOURCE_ADDRESS_SPACE
to be a bit more useful, as fragmentation will now turn in
to a low-resource notification.
This commit is contained in:
Augustin Cavalier 2022-03-09 18:14:47 -05:00
parent 3d01655a91
commit 42ed7815ff
1 changed files with 41 additions and 7 deletions
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48
src/system/kernel/low_resource_manager.cpp
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@ -244,13 +244,17 @@ low_resource_manager(void*)
{
bigtime_t timeout = kLowResourceInterval;
while (true) {
acquire_sem_etc(sLowResourceWaitSem, 1, B_RELATIVE_TIMEOUT,
timeout);
const status_t status = acquire_sem_etc(sLowResourceWaitSem, 1,
B_RELATIVE_TIMEOUT, timeout);
RecursiveLocker _(&sLowResourceLock);
compute_state();
int32 state = low_resource_state_no_update(B_ALL_KERNEL_RESOURCES);
// Do not recompute the state if we actually acquired the semaphore,
// as in this case, it has likely been set to something specific.
if (status == B_TIMED_OUT)
compute_state();
const int32 state = low_resource_state_no_update(B_ALL_KERNEL_RESOURCES);
TRACE(("low_resource_manager: state = %ld, %ld free pages, %lld free "
"memory, %lu free semaphores\n", state, vm_page_num_free_pages(),
@ -326,13 +330,43 @@ dump_handlers(int argc, char** argv)
void
low_resource(uint32 resource, uint64 requirements, uint32 flags, uint32 timeout)
{
// TODO: take requirements into account
switch (resource) {
case B_KERNEL_RESOURCE_PAGES:
case B_KERNEL_RESOURCE_MEMORY:
if (requirements <= kCriticalPagesLimit)
sLowPagesState = B_LOW_RESOURCE_CRITICAL;
else if (requirements <= kWarnPagesLimit)
sLowPagesState = B_LOW_RESOURCE_WARNING;
else
sLowPagesState = B_LOW_RESOURCE_NOTE;
break;
case B_KERNEL_RESOURCE_MEMORY: {
const off_t required = requirements;
if (required <= sCriticalMemoryLimit)
sLowMemoryState = B_LOW_RESOURCE_CRITICAL;
else if (required <= sWarnMemoryLimit)
sLowMemoryState = B_LOW_RESOURCE_WARNING;
else
sLowMemoryState = B_LOW_RESOURCE_NOTE;
break;
}
case B_KERNEL_RESOURCE_SEMAPHORES:
if (requirements <= 4)
sLowSemaphoresState = B_LOW_RESOURCE_CRITICAL;
else if (requirements <= 32)
sLowSemaphoresState = B_LOW_RESOURCE_WARNING;
else
sLowSemaphoresState = B_LOW_RESOURCE_NOTE;
break;
case B_KERNEL_RESOURCE_ADDRESS_SPACE:
if (requirements <= (kCriticalPagesLimit * B_PAGE_SIZE))
sLowSpaceState = B_LOW_RESOURCE_CRITICAL;
else if (requirements <= (kWarnPagesLimit * B_PAGE_SIZE))
sLowSpaceState = B_LOW_RESOURCE_WARNING;
else
sLowSpaceState = B_LOW_RESOURCE_NOTE;
break;
}