Patch by Zhao Shuai with some changes by myself:
* Added functions swap_free_page_swap_space(), swap_available_pages(), and swap_total_swap_pages(). They will be used by the page daemon code. * Free allocated swap space in the VMAnonymousCache destructor. * Write(): First free swap space assigned to the pages to be written (was leaked before) and update fAllocatedSwapSize upfront. Both is now done with the cache locked, as it should be. * Fixes several instance where the cache offset in bytes was used instead of in pages. * Print the correct error when _kern_write_stat() fails. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26926 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
parent
4b7da592ee
commit
77acd7fece
@ -141,6 +141,18 @@ static mutex sAvailSwapSpaceLock;
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VMAnonymousCache::~VMAnonymousCache()
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{
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// free allocated swap space and swap block
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for (off_t offset = virtual_base, toFree = fAllocatedSwapSize;
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offset < virtual_end && toFree > 0; offset += B_PAGE_SIZE) {
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swap_addr_t pageIndex = _SwapBlockGetAddress(offset >> PAGE_SHIFT);
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if (pageIndex == SWAP_PAGE_NONE)
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continue;
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swap_page_dealloc(pageIndex, 1);
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_SwapBlockFree(offset >> PAGE_SHIFT);
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toFree -= B_PAGE_SIZE;
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}
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swap_space_unreserve(fCommittedSwapSize);
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vm_unreserve_memory(committed_size);
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}
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@ -234,10 +246,24 @@ status_t
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VMAnonymousCache::Write(off_t offset, const iovec *vecs, size_t count,
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size_t *_numBytes)
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{
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if (fAllocatedSwapSize + count * PAGE_SIZE > fCommittedSwapSize)
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offset >>= PAGE_SHIFT;
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Lock();
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for (uint32 i = 0; i < count; i++) {
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swap_addr_t pageIndex = _SwapBlockGetAddress(offset + i);
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if (pageIndex != SWAP_PAGE_NONE) {
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swap_page_dealloc(pageIndex, 1);
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_SwapBlockFree(offset + i);
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fAllocatedSwapSize -= B_PAGE_SIZE;
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}
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}
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if (fAllocatedSwapSize + count * B_PAGE_SIZE > fCommittedSwapSize)
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return B_ERROR;
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offset >>= PAGE_SHIFT;
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fAllocatedSwapSize += count * B_PAGE_SIZE;
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Unlock();
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uint32 n = count;
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for (uint32 i = 0; i < count; i += n) {
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swap_addr_t pageIndex;
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@ -248,24 +274,28 @@ VMAnonymousCache::Write(off_t offset, const iovec *vecs, size_t count,
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if (pageIndex == SWAP_PAGE_NONE)
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panic("can't allocate swap space\n");
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fAllocatedSwapSize += n * PAGE_SIZE;
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for (uint32 j = 0; j < n; j++)
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_SwapBlockBuild(offset + i + j, pageIndex + j);
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swap_file *swapFile = find_swap_file(pageIndex);
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if (swapFile == NULL) {
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panic("can't find swap file for page index %ld\n", pageIndex);
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return B_ERROR;
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}
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off_t pos = (pageIndex - swapFile->first_page) * PAGE_SIZE;
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off_t pos = (pageIndex - swapFile->first_page) * B_PAGE_SIZE;
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status_t status = vfs_write_pages(swapFile->vnode, NULL, pos, vecs + i,
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n, 0, _numBytes);
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if (status != B_OK)
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if (status != B_OK) {
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Lock();
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fAllocatedSwapSize -= n * B_PAGE_SIZE;
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Unlock();
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swap_page_dealloc(pageIndex, n);
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return status;
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}
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for (uint32 j = 0; j < n; j++)
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_SwapBlockBuild(offset + i + j, pageIndex + j);
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}
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return B_OK;
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}
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@ -332,29 +362,32 @@ VMAnonymousCache::MergeStore(VMCache* _source)
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// TODO: iterate over swap blocks
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for (off_t offset = source->virtual_base; offset < source->virtual_end;
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offset += PAGE_SIZE) {
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swap_addr_t sourceSwapIndex = source->_SwapBlockGetAddress(offset);
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off_t cacheOffset = offset >> PAGE_SHIFT;
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swap_addr_t sourceSwapIndex = source->_SwapBlockGetAddress(cacheOffset);
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if (sourceSwapIndex == SWAP_PAGE_NONE)
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// this page is not swapped out
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continue;
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if (LookupPage(offset))
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if (LookupPage(offset)) {
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// this page is shadowed and we can find it in the new cache,
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// free the swap space
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swap_page_dealloc(sourceSwapIndex, 1);
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else {
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swap_addr_t swapIndex = _SwapBlockGetAddress(offset);
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} else {
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swap_addr_t swapIndex = _SwapBlockGetAddress(cacheOffset);
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if (swapIndex == SWAP_PAGE_NONE) {
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// the page is not shadowed,
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// assign the swap address to the new cache
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_SwapBlockBuild(offset, sourceSwapIndex);
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_SwapBlockBuild(cacheOffset, sourceSwapIndex);
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fAllocatedSwapSize += B_PAGE_SIZE;
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} else {
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// the page is shadowed and is also swapped out
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swap_page_dealloc(sourceSwapIndex, 1);
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}
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}
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source->_SwapBlockFree(offset);
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source->fAllocatedSwapSize -= B_PAGE_SIZE;
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source->_SwapBlockFree(cacheOffset);
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}
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}
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@ -400,7 +433,6 @@ VMAnonymousCache::_SwapBlockFree(off_t cacheOffset)
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mutex_lock(&sSwapHashLock);
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swap_hash_key key = { this, cacheOffset };
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swap_block *swap = sSwapHashTable.Lookup(key);
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if (swap != NULL) {
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swap_addr_t pageIndex = swap->swap_pages[cacheOffset & SWAP_BLOCK_MASK];
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@ -504,6 +536,52 @@ find_swap_file(swap_addr_t pageIndex)
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}
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// used by page daemon to free swap space
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bool
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swap_free_page_swap_space(vm_page *page)
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{
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VMAnonymousCache *cache = dynamic_cast<VMAnonymousCache *>(page->cache);
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if (cache == NULL)
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return false;
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swap_addr_t pageIndex = cache->_SwapBlockGetAddress(page->cache_offset);
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if (pageIndex == SWAP_PAGE_NONE)
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return false;
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swap_page_dealloc(pageIndex, 1);
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cache->fAllocatedSwapSize -= B_PAGE_SIZE;
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cache->_SwapBlockFree(page->cache_offset);
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return true;
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}
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uint32
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swap_available_pages()
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{
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mutex_lock(&sAvailSwapSpaceLock);
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uint32 avail = sAvailSwapSpace >> PAGE_SHIFT;
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mutex_unlock(&sAvailSwapSpaceLock);
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return avail;
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}
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uint32
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swap_total_swap_pages()
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{
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mutex_lock(&sSwapFileListLock);
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uint32 totalSwapPages = 0;
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for (SwapFileList::Iterator it = sSwapFileList.GetIterator();
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swap_file *swapFile = it.Next();)
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totalSwapPages += swapFile->last_page - swapFile->first_page;
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mutex_unlock(&sSwapFileListLock);
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return totalSwapPages;
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}
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static swap_addr_t
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swap_page_alloc(uint32 npages)
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{
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@ -567,6 +645,9 @@ swap_page_alloc(uint32 npages)
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static void
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swap_page_dealloc(swap_addr_t pageIndex, uint32 npages)
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{
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if (pageIndex == SWAP_PAGE_NONE)
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return;
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mutex_lock(&sSwapFileListLock);
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swap_file *swapFile = find_swap_file(pageIndex);
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@ -772,10 +853,11 @@ swap_init_post_modules()
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struct stat stat;
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stat.st_size = size;
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if (_kern_write_stat(fd, NULL, false, &stat, sizeof(struct stat),
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B_STAT_SIZE | B_STAT_SIZE_INSECURE) != B_OK) {
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status_t error = _kern_write_stat(fd, NULL, false, &stat,
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sizeof(struct stat), B_STAT_SIZE | B_STAT_SIZE_INSECURE);
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if (error != B_OK) {
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dprintf("Failed to resize /var/swap to %lld bytes: %s\n", size,
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strerror(errno));
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strerror(error));
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}
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close(fd);
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@ -17,6 +17,15 @@
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typedef page_num_t swap_addr_t;
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struct swap_block;
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extern "C" {
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void swap_init(void);
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void swap_init_post_modules(void);
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bool swap_free_page_swap_space(vm_page *page);
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uint32 swap_available_pages(void);
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uint32 swap_total_swap_pages(void);
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}
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class VMAnonymousCache : public VMCache {
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public:
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virtual ~VMAnonymousCache();
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@ -43,6 +52,8 @@ private:
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status_t _Commit(off_t size);
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private:
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friend bool swap_free_page_swap_space(vm_page *page);
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bool fCanOvercommit;
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bool fHasPrecommitted;
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uint8 fPrecommittedPages;
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@ -51,12 +62,6 @@ private:
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off_t fAllocatedSwapSize;
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};
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extern "C" {
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void swap_init(void);
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void swap_init_post_modules();
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}
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#endif // ENABLE_SWAP_SUPPORT
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#endif /* _KERNEL_VM_STORE_ANONYMOUS_H */
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