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* B_LOW_MEMORY_NOTE now starts earlier, at 8 MB left.

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* vm_low_memory_state() now periodically recomputes the state in case the
  low memory thread is waiting for something.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22483 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-10-08 13:56:49 +00:00
parent 7faf279d73
commit 899d854005
1 changed files with 7 additions and 1 deletions
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src/system/kernel/vm/vm_low_memory.cpp
+7 -1
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@@ -40,12 +40,13 @@ static const bigtime_t kLowMemoryInterval = 3000000; // 3 secs
static const bigtime_t kWarnMemoryInterval = 500000; // 0.5 secs static const bigtime_t kWarnMemoryInterval = 500000; // 0.5 secs
// page limits // page limits
static const size_t kNoteLimit = 1024; static const size_t kNoteLimit = 2048;
static const size_t kWarnLimit = 256; static const size_t kWarnLimit = 256;
static const size_t kCriticalLimit = 32; static const size_t kCriticalLimit = 32;
static int32 sLowMemoryState = B_NO_LOW_MEMORY; static int32 sLowMemoryState = B_NO_LOW_MEMORY;
static bigtime_t sLastMeasurement;
static mutex sLowMemoryMutex; static mutex sLowMemoryMutex;
static sem_id sLowMemoryWaitSem; static sem_id sLowMemoryWaitSem;
@@ -69,6 +70,8 @@ call_handlers(int32 level)
static int32 static int32
compute_state(void) compute_state(void)
{ {
sLastMeasurement = system_time();
uint32 freePages = vm_page_num_free_pages(); uint32 freePages = vm_page_num_free_pages();
if (freePages >= kNoteLimit) if (freePages >= kNoteLimit)
return B_NO_LOW_MEMORY; return B_NO_LOW_MEMORY;
@@ -148,6 +151,9 @@ vm_low_memory(size_t requirements)
int32 int32
vm_low_memory_state(void) vm_low_memory_state(void)
{ {
if (system_time() - sLastMeasurement > 500000)
sLowMemoryState = compute_state();
return sLowMemoryState; return sLowMemoryState;
} }