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VMware balloon: Update balloon target on each lock/unlock.
Instead of waiting for the next GET_TARGET command, we can react faster by exploiting the fact that each hypervisor call also returns the balloon target. Signed-off-by: Xavier Deguillard <xdeguillard@vmware.com> Acked-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Philip P. Moltmann <moltmann@vmware.com> Acked-by: Andy King <acking@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 42 additions and 43 deletions
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@ -47,7 +47,7 @@
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MODULE_AUTHOR("VMware, Inc.");
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MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
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MODULE_VERSION("1.3.1.0-k");
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MODULE_VERSION("1.3.2.0-k");
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MODULE_ALIAS("dmi:*:svnVMware*:*");
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MODULE_ALIAS("vmware_vmmemctl");
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MODULE_LICENSE("GPL");
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@ -255,8 +255,10 @@ struct vmballoon;
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struct vmballoon_ops {
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void (*add_page)(struct vmballoon *b, int idx, struct page *p);
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int (*lock)(struct vmballoon *b, unsigned int num_pages);
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int (*unlock)(struct vmballoon *b, unsigned int num_pages);
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int (*lock)(struct vmballoon *b, unsigned int num_pages,
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unsigned int *target);
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int (*unlock)(struct vmballoon *b, unsigned int num_pages,
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unsigned int *target);
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};
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struct vmballoon {
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@ -413,7 +415,7 @@ static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target)
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* check the return value and maybe submit a different page.
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*/
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static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
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unsigned int *hv_status)
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unsigned int *hv_status, unsigned int *target)
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{
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unsigned long status, dummy = 0;
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u32 pfn32;
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@ -424,7 +426,7 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
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STATS_INC(b->stats.lock);
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*hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy, dummy);
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*hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy, *target);
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if (vmballoon_check_status(b, status))
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return 0;
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@ -434,14 +436,14 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
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}
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static int vmballoon_send_batched_lock(struct vmballoon *b,
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unsigned int num_pages)
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unsigned int num_pages, unsigned int *target)
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{
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unsigned long status, dummy;
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unsigned long status;
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unsigned long pfn = page_to_pfn(b->page);
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STATS_INC(b->stats.lock);
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status = VMWARE_BALLOON_CMD(BATCHED_LOCK, pfn, num_pages, dummy);
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status = VMWARE_BALLOON_CMD(BATCHED_LOCK, pfn, num_pages, *target);
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if (vmballoon_check_status(b, status))
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return 0;
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@ -454,7 +456,8 @@ static int vmballoon_send_batched_lock(struct vmballoon *b,
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* Notify the host that guest intends to release given page back into
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* the pool of available (to the guest) pages.
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*/
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static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn)
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static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn,
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unsigned int *target)
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{
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unsigned long status, dummy = 0;
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u32 pfn32;
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@ -465,7 +468,7 @@ static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn)
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STATS_INC(b->stats.unlock);
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status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy, dummy);
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status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy, *target);
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if (vmballoon_check_status(b, status))
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return true;
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@ -475,14 +478,14 @@ static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn)
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}
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static bool vmballoon_send_batched_unlock(struct vmballoon *b,
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unsigned int num_pages)
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unsigned int num_pages, unsigned int *target)
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{
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unsigned long status, dummy;
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unsigned long status;
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unsigned long pfn = page_to_pfn(b->page);
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STATS_INC(b->stats.unlock);
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status = VMWARE_BALLOON_CMD(BATCHED_UNLOCK, pfn, num_pages, dummy);
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status = VMWARE_BALLOON_CMD(BATCHED_UNLOCK, pfn, num_pages, *target);
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if (vmballoon_check_status(b, status))
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return true;
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@ -528,12 +531,14 @@ static void vmballoon_pop(struct vmballoon *b)
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* refuse list, those refused page are then released at the end of the
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* inflation cycle.
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*/
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static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages)
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static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
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unsigned int *target)
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{
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int locked, hv_status;
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struct page *page = b->page;
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locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status);
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locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
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target);
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if (locked > 0) {
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STATS_INC(b->stats.refused_alloc);
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@ -567,11 +572,11 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages)
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}
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static int vmballoon_lock_batched_page(struct vmballoon *b,
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unsigned int num_pages)
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unsigned int num_pages, unsigned int *target)
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{
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int locked, i;
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locked = vmballoon_send_batched_lock(b, num_pages);
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locked = vmballoon_send_batched_lock(b, num_pages, target);
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if (locked > 0) {
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for (i = 0; i < num_pages; i++) {
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u64 pa = vmballoon_batch_get_pa(b->batch_page, i);
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@ -620,11 +625,12 @@ static int vmballoon_lock_batched_page(struct vmballoon *b,
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* the host so it can make sure the page will be available for the guest
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* to use, if needed.
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*/
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static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages)
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static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages,
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unsigned int *target)
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{
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struct page *page = b->page;
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if (!vmballoon_send_unlock_page(b, page_to_pfn(page))) {
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if (!vmballoon_send_unlock_page(b, page_to_pfn(page), target)) {
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list_add(&page->lru, &b->pages);
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return -EIO;
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}
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@ -640,12 +646,12 @@ static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages)
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}
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static int vmballoon_unlock_batched_page(struct vmballoon *b,
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unsigned int num_pages)
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unsigned int num_pages, unsigned int *target)
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{
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int locked, i, ret = 0;
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bool hv_success;
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hv_success = vmballoon_send_batched_unlock(b, num_pages);
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hv_success = vmballoon_send_batched_unlock(b, num_pages, target);
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if (!hv_success)
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ret = -EIO;
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@ -710,9 +716,7 @@ static void vmballoon_add_batched_page(struct vmballoon *b, int idx,
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*/
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static void vmballoon_inflate(struct vmballoon *b)
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{
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unsigned int goal;
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unsigned int rate;
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unsigned int i;
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unsigned int allocations = 0;
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unsigned int num_pages = 0;
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int error = 0;
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@ -735,7 +739,6 @@ static void vmballoon_inflate(struct vmballoon *b)
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* slowdown page allocations considerably.
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*/
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goal = b->target - b->size;
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/*
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* Start with no sleep allocation rate which may be higher
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* than sleeping allocation rate.
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@ -744,16 +747,17 @@ static void vmballoon_inflate(struct vmballoon *b)
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b->rate_alloc : VMW_BALLOON_NOSLEEP_ALLOC_MAX;
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pr_debug("%s - goal: %d, no-sleep rate: %d, sleep rate: %d\n",
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__func__, goal, rate, b->rate_alloc);
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__func__, b->target - b->size, rate, b->rate_alloc);
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for (i = 0; i < goal; i++) {
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struct page *page = alloc_page(flags);
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while (b->size < b->target && num_pages < b->target - b->size) {
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struct page *page;
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if (flags == VMW_PAGE_ALLOC_NOSLEEP)
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STATS_INC(b->stats.alloc);
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else
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STATS_INC(b->stats.sleep_alloc);
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page = alloc_page(flags);
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if (!page) {
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if (flags == VMW_PAGE_ALLOC_CANSLEEP) {
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/*
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@ -778,7 +782,7 @@ static void vmballoon_inflate(struct vmballoon *b)
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*/
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b->slow_allocation_cycles = VMW_BALLOON_SLOW_CYCLES;
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if (i >= b->rate_alloc)
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if (allocations >= b->rate_alloc)
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break;
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flags = VMW_PAGE_ALLOC_CANSLEEP;
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@ -789,7 +793,7 @@ static void vmballoon_inflate(struct vmballoon *b)
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b->ops->add_page(b, num_pages++, page);
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if (num_pages == b->batch_max_pages) {
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error = b->ops->lock(b, num_pages);
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error = b->ops->lock(b, num_pages, &b->target);
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num_pages = 0;
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if (error)
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break;
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@ -800,21 +804,21 @@ static void vmballoon_inflate(struct vmballoon *b)
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allocations = 0;
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}
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if (i >= rate) {
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if (allocations >= rate) {
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/* We allocated enough pages, let's take a break. */
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break;
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}
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}
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if (num_pages > 0)
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b->ops->lock(b, num_pages);
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b->ops->lock(b, num_pages, &b->target);
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/*
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* We reached our goal without failures so try increasing
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* allocation rate.
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*/
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if (error == 0 && i >= b->rate_alloc) {
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unsigned int mult = i / b->rate_alloc;
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if (error == 0 && allocations >= b->rate_alloc) {
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unsigned int mult = allocations / b->rate_alloc;
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b->rate_alloc =
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min(b->rate_alloc + mult * VMW_BALLOON_RATE_ALLOC_INC,
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{
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struct page *page, *next;
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unsigned int i = 0;
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unsigned int goal;
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unsigned int num_pages = 0;
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int error;
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pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target);
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/* limit deallocation rate */
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goal = min(b->size - b->target, b->rate_free);
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pr_debug("%s - goal: %d, rate: %d\n", __func__, goal, b->rate_free);
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pr_debug("%s - size: %d, target %d, rate: %d\n", __func__, b->size,
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b->target, b->rate_free);
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/* free pages to reach target */
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list_for_each_entry_safe(page, next, &b->pages, lru) {
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b->ops->add_page(b, num_pages++, page);
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if (num_pages == b->batch_max_pages) {
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error = b->ops->unlock(b, num_pages);
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error = b->ops->unlock(b, num_pages, &b->target);
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num_pages = 0;
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if (error) {
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/* quickly decrease rate in case of error */
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}
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}
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if (++i >= goal)
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if (++i >= b->size - b->target)
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break;
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}
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if (num_pages > 0)
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b->ops->unlock(b, num_pages);
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b->ops->unlock(b, num_pages, &b->target);
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/* slowly increase rate if there were no errors */
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if (error == 0)
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