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* The low memory handler now runs more often in more critical situations.

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* vm_low_memory() no longer calls call_handlers() directly, but just triggers
  a run immediately.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22313 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2007-09-25 23:58:31 +00:00
parent 4af29ec0bd
commit 3cd731ada3
1 changed files with 27 additions and 15 deletions
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src/system/kernel/vm/vm_low_memory.cpp
+27 -15
View File
@@ -1,5 +1,5 @@
/*
* Copyright 2005-2006, Axel Dörfler, [email protected].
* Copyright 2005-2007, Axel Dörfler, [email protected].
* Distributed under the terms of the MIT License.
*/
@@ -26,16 +26,6 @@
// TODO: the priority is currently ignored, and probably can be removed
static const bigtime_t kLowMemoryInterval = 3000000; // 3 secs
// page limits
static const size_t kNoteLimit = 1024;
static const size_t kWarnLimit = 256;
static const size_t kCriticalLimit = 32;
static int32 sLowMemoryState = B_NO_LOW_MEMORY;
struct low_memory_handler : public DoublyLinkedListLinkImpl<low_memory_handler> {
low_memory_func function;
void *data;
@@ -44,6 +34,18 @@ struct low_memory_handler : public DoublyLinkedListLinkImpl<low_memory_handler>
typedef DoublyLinkedList<low_memory_handler> HandlerList;
static const bigtime_t kLowMemoryInterval = 3000000; // 3 secs
static const bigtime_t kWarnMemoryInterval = 500000; // 0.5 secs
// page limits
static const size_t kNoteLimit = 1024;
static const size_t kWarnLimit = 256;
static const size_t kCriticalLimit = 32;
static int32 sLowMemoryState = B_NO_LOW_MEMORY;
static mutex sLowMemoryMutex;
static sem_id sLowMemoryWaitSem;
static HandlerList sLowMemoryHandlers;
@@ -83,8 +85,12 @@ compute_state(void)
static int32
low_memory(void *)
{
bigtime_t timeout = kLowMemoryInterval;
while (true) {
snooze(kLowMemoryInterval);
if (sLowMemoryState != B_LOW_MEMORY_CRITICAL) {
acquire_sem_etc(sLowMemoryWaitSem, 1, B_RELATIVE_TIMEOUT,
timeout);
}
sLowMemoryState = compute_state();
@@ -95,6 +101,11 @@ low_memory(void *)
continue;
call_handlers(sLowMemoryState);
if (sLowMemoryState == B_LOW_MEMORY_WARNING)
timeout = kWarnMemoryInterval;
else
timeout = kLowMemoryInterval;
}
return 0;
}
@@ -103,9 +114,9 @@ low_memory(void *)
void
vm_low_memory(size_t requirements)
{
// ToDo: compute level with requirements in mind
// TODO: take requirements into account
call_handlers(B_LOW_MEMORY_NOTE);
release_sem(sLowMemoryWaitSem);
}
@@ -132,7 +143,8 @@ vm_low_memory_init(void)
// static initializers do not work in the kernel,
// so we have to do it here, manually
thread = spawn_kernel_thread(&low_memory, "low memory handler", B_LOW_PRIORITY, NULL);
thread = spawn_kernel_thread(&low_memory, "low memory handler",
B_LOW_PRIORITY, NULL);
send_signal_etc(thread, SIGCONT, B_DO_NOT_RESCHEDULE);
return B_OK;