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* There is no need for the sPageLock to be a spinlock - a mutex should do. This

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should improve the kernel latencies, as things like
  vm_page_allocate_page_run() is very expensive.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33807 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2009-10-28 10:44:29 +00:00
parent 64e8303b6d
commit 7d6c7206c1
1 changed files with 23 additions and 27 deletions
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src/system/kernel/vm/vm_page.cpp
+23 -27
View File
@@ -1,5 +1,5 @@
/*
* Copyright 2002-2008, Axel Dörfler, [email protected].
* Copyright 2002-2009, Axel Dörfler, [email protected].
* Distributed under the terms of the MIT License.
*
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
@@ -77,7 +77,7 @@ static vint32 sPageDeficit;
static size_t sModifiedTemporaryPages;
static ConditionVariable sFreePageCondition;
static spinlock sPageLock;
static mutex sPageLock = MUTEX_INITIALIZER("pages");
static sem_id sWriterWaitSem;
@@ -851,7 +851,7 @@ page_scrubber(void *unused)
if (sFreePageQueue.count == 0)
continue;
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
// Since we temporarily remove pages from the free pages reserve,
// we must make sure we don't cause a violation of the page
@@ -933,7 +933,7 @@ remove_page_marker(struct vm_page &marker)
return;
}
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
remove_page_from_queue(queue, &marker);
marker.state = PAGE_STATE_UNUSED;
@@ -943,7 +943,7 @@ remove_page_marker(struct vm_page &marker)
static vm_page *
next_modified_page(struct vm_page &marker)
{
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
vm_page *page;
if (marker.state == PAGE_STATE_MODIFIED) {
@@ -1327,7 +1327,7 @@ PageWriterRun::Go()
fWrappers[checkIndex++].CheckRemoveFromShrunkenCache();
}
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
for (uint32 j = 0; j < transfer.PageCount(); j++)
fWrappers[wrapperIndex++].Done(transfer.Status());
@@ -1461,7 +1461,7 @@ page_writer(void* /*unused*/)
continue;
}
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
// state might have changed while we were locking the cache
if (page->state != PAGE_STATE_MODIFIED) {
@@ -1518,7 +1518,7 @@ page_writer(void* /*unused*/)
static vm_page *
find_page_candidate(struct vm_page &marker, bool stealActive)
{
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
page_queue *queue;
vm_page *page;
@@ -1605,7 +1605,7 @@ steal_page(vm_page *page, bool stealActive)
page->cache->RemovePage(page);
InterruptsSpinLocker _(sPageLock);
MutexLocker _(sPageLock);
remove_page_from_queue(page->state == PAGE_STATE_ACTIVE
? &sActivePageQueue : &sInactivePageQueue, page);
return true;
@@ -1633,7 +1633,7 @@ steal_pages(vm_page **pages, size_t count, bool reserve)
if (steal_page(page, false)) {
if (reserve || stolen >= maxCount) {
InterruptsSpinLocker _(sPageLock);
MutexLocker _(sPageLock);
enqueue_page(&sFreePageQueue, page);
page->state = PAGE_STATE_FREE;
@@ -1649,7 +1649,7 @@ steal_pages(vm_page **pages, size_t count, bool reserve)
remove_page_marker(marker);
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
if ((reserve && sReservedPages <= free_page_queue_count())
|| count == 0
@@ -1743,7 +1743,7 @@ vm_page_write_modified_page_range(struct VMCache* cache, uint32 firstPage,
bool dequeuedPage = false;
if (page != NULL) {
if (page->state == PAGE_STATE_MODIFIED) {
InterruptsSpinLocker locker(&sPageLock);
MutexLocker locker(&sPageLock);
remove_page_from_queue(&sModifiedPageQueue, page);
dequeuedPage = true;
} else if (page->state == PAGE_STATE_BUSY
@@ -1787,7 +1787,7 @@ vm_page_write_modified_page_range(struct VMCache* cache, uint32 firstPage,
wrappers[i]->CheckRemoveFromShrunkenCache();
}
InterruptsSpinLocker locker(&sPageLock);
MutexLocker locker(&sPageLock);
for (int32 i = 0; i < usedWrappers; i++)
wrappers[i]->Done(status);
@@ -2001,8 +2001,7 @@ vm_mark_page_range_inuse(addr_t startPage, addr_t length)
return B_BAD_VALUE;
}
cpu_status state = disable_interrupts();
acquire_spinlock(&sPageLock);
MutexLocker _(sPageLock);
for (addr_t i = 0; i < length; i++) {
vm_page *page = &sPages[startPage + i];
@@ -2026,9 +2025,6 @@ vm_mark_page_range_inuse(addr_t startPage, addr_t length)
}
}
release_spinlock(&sPageLock);
restore_interrupts(state);
return B_OK;
}
@@ -2044,7 +2040,7 @@ vm_page_unreserve_pages(uint32 count)
if (count == 0)
return;
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
ASSERT(sReservedPages >= count);
T(UnreservePages(count));
@@ -2067,7 +2063,7 @@ vm_page_reserve_pages(uint32 count)
if (count == 0)
return;
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
T(ReservePages(count));
@@ -2091,7 +2087,7 @@ vm_page_try_reserve_pages(uint32 count)
if (count == 0)
return true;
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
T(ReservePages(count));
@@ -2125,7 +2121,7 @@ vm_page_allocate_page(int pageState, bool reserved)
return NULL; // invalid
}
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
T(AllocatePage(reserved));
@@ -2210,7 +2206,7 @@ vm_page_allocate_page_run(int pageState, addr_t base, addr_t length)
vm_page *firstPage = NULL;
uint32 start = base >> PAGE_SHIFT;
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
if (free_page_queue_count() - sReservedPages < length) {
// TODO: add more tries, ie. free some inactive, ...
@@ -2266,7 +2262,7 @@ vm_page_allocate_page_run(int pageState, addr_t base, addr_t length)
vm_page *
vm_page_allocate_page_run_no_base(int pageState, addr_t count)
{
InterruptsSpinLocker locker(sPageLock);
MutexLocker locker(sPageLock);
if (free_page_queue_count() - sReservedPages < count) {
// TODO: add more tries, ie. free some inactive, ...
@@ -2370,7 +2366,7 @@ vm_lookup_page(addr_t pageNumber)
void
vm_page_free(vm_cache *cache, vm_page *page)
{
InterruptsSpinLocker _(sPageLock);
MutexLocker _(sPageLock);
if (page->cache == NULL && page->state == PAGE_STATE_MODIFIED
&& cache->temporary) {
@@ -2384,7 +2380,7 @@ vm_page_free(vm_cache *cache, vm_page *page)
status_t
vm_page_set_state(vm_page *page, int pageState)
{
InterruptsSpinLocker _(sPageLock);
MutexLocker _(sPageLock);
return set_page_state_nolock(page, pageState);
}
@@ -2396,7 +2392,7 @@ vm_page_set_state(vm_page *page, int pageState)
void
vm_page_requeue(struct vm_page *page, bool tail)
{
InterruptsSpinLocker _(sPageLock);
MutexLocker _(sPageLock);
page_queue *queue = NULL;
switch (page->state) {