search for: balloon_stats

...to xen.git as xen/memory-hotplug so people > can play with it more easily (but I haven''t merged it into any of the > other branches yet). Thx. > >+#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG > >+static inline unsigned long current_target(void) > >+{ > >+ return balloon_stats.target_pages; > > Why does this need its own version? Because original version return values not bigger then initial memory allocation which does not allow memory hotplug to function. > >+int __ref xen_add_memory(int nid, u64 start, u64 size) > >+{ > >+ pg_data_t *pgdat =...

...are there many differences between pv and hvm? No. Only those changes are needed where xen_domain()/xen_pv_domain() is used. > >>>+#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG > >>>+static inline unsigned long current_target(void) > >>>+{ > >>>+ return balloon_stats.target_pages; > >>Why does this need its own version? > >Because original version return values not bigger > >then initial memory allocation which does not allow > >memory hotplug to function. > > But surely they can be combined? A system without > XEN_BALLOON_M...

...r. */ @@ -172,11 +171,6 @@ static struct page *balloon_next_page(struct page *page) return list_entry(next, struct page, lru); } -static void balloon_alarm(unsigned long unused) -{ - schedule_work(&balloon_worker); -} - static unsigned long current_target(void) { unsigned long target = balloon_stats.target_pages; @@ -333,7 +327,7 @@ static void balloon_process(struct work_struct *work) /* Schedule more work if there is some still to be done. */ if (current_target() != balloon_stats.current_pages) - mod_timer(&balloon_timer, jiffies + HZ); + schedule_delayed_work(&balloon_worker...

...cess.h> #include <asm/page.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> -#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/xen/hypervisor.h> @@ -154,8 +154,7 @@ static struct page *balloon_retrieve(void) if (PageHighMem(page)) { balloon_stats.balloon_high--; inc_totalhigh_pages(); - } - else + } else balloon_stats.balloon_low--; totalram_pages++; @@ -274,7 +273,8 @@ static int decrease_reservation(unsigned long nr_pages) nr_pages = ARRAY_SIZE(frame_list); for (i = 0; i < nr_pages; i++) { - if ((page = alloc_page(GFP...

...cess.h> #include <asm/page.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> -#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/xen/hypervisor.h> @@ -154,8 +154,7 @@ static struct page *balloon_retrieve(void) if (PageHighMem(page)) { balloon_stats.balloon_high--; inc_totalhigh_pages(); - } - else + } else balloon_stats.balloon_low--; totalram_pages++; @@ -274,7 +273,8 @@ static int decrease_reservation(unsigned long nr_pages) nr_pages = ARRAY_SIZE(frame_list); for (i = 0; i < nr_pages; i++) { - if ((page = alloc_page(GFP...

...cess.h> #include <asm/page.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> -#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/xen/hypervisor.h> @@ -154,8 +154,7 @@ static struct page *balloon_retrieve(void) if (PageHighMem(page)) { balloon_stats.balloon_high--; inc_totalhigh_pages(); - } - else + } else balloon_stats.balloon_low--; totalram_pages++; @@ -274,7 +273,8 @@ static int decrease_reservation(unsigned long nr_pages) nr_pages = ARRAY_SIZE(frame_list); for (i = 0; i < nr_pages; i++) { - if ((page = alloc_page(GFP...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 930fb68..c8aab4e 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 930fb68..c8aab4e 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 930fb68..c8aab4e 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

...if (alloc_xenballooned_pages(count, add->pages, false /* lowmem */)) goto err; for (i = 0; i < count; i++) { diff --git a/include/xen/balloon.h b/include/xen/balloon.h index 76f7538..b1a8233 100644 --- a/include/xen/balloon.h +++ b/include/xen/balloon.h @@ -25,7 +25,8 @@ extern struct balloon_stats balloon_stats; void balloon_set_new_target(unsigned long target); -int alloc_xenballooned_pages(int nr_pages, struct page** pages); +int alloc_xenballooned_pages(int nr_pages, struct page** pages, + bool highmem); void free_xenballooned_pages(int nr_pages, struct page** pages); struct sys...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index d42da3b..a453c05 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index d42da3b..a453c05 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

...; + page = balloon_pfn_to_page(pfns[i]); + balloon_page_free(page); + adjust_managed_page_count(page, 1); } } diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index d42da3b..a453c05 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -89,14 +89,6 @@ EXPORT_SYMBOL_GPL(balloon_stats); /* We increase/decrease in batches which fit in a page */ static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)]; -#ifdef CONFIG_HIGHMEM -#define inc_totalhigh_pages() (totalhigh_pages++) -#define dec_totalhigh_pages() (totalhigh_pages--) -#else -#define inc_totalhigh_pages() do {} wh...

This series implements ballooning for Xen on ARM and builds and Mukesh''s PVH privcmd stuff to implement foreign page mapping on ARM, replacing the old "HACK: initial (very hacky) XENMAPSPACE_gmfn_foreign" patch. The baseline is a bit complex, it is basically Stefano''s xenarm-forlinus branch (commit bbd6eb29214e) merged with Konrad''s linux-next-pvh branch

...de capable of inflating/deflating the balloon automatically or only manually by using xm mem-set? 3. The guest OS balloon driver will have to be modified, will any modifications to xen(dom0) be required? 4. What exactly does the number of pages in high- and low-memory balloons in the balloon_stats structure and in the output of cat /proc/xen/balloon mean? 5. What is the current state of the balloon driver? Please correct me if my any of my assumptions are wrong. I''d be very grateful if someone could provide any information regarding this. Thanks, Ashutosh _________________...

...,10 @@ static enum bp_state reserve_additional_memory(void) if (rc) { pr_warn("Cannot add additional memory (%i)\n", rc); goto err; + } else { + resource = NULL; + /* Try to reduce the number of system ram resources. */ + merge_system_ram_resources(&iomem_resource); } balloon_stats.total_pages += balloon_hotplug; -- 2.26.2

Some add_memory*() users add memory in small, contiguous memory blocks. Examples include virtio-mem, hyper-v balloon, and the XEN balloon. This can quickly result in a lot of memory resources, whereby the actual resource boundaries are not of interest (e.g., it might be relevant for DIMMs, exposed via /proc/iomem to user space). We really want to merge added resources in this scenario where

This is the follow-up of "[PATCH RFCv1 0/5] mm/memory_hotplug: selective merging of memory resources" [1] Some add_memory*() users add memory in small, contiguous memory blocks. Examples include virtio-mem, hyper-v balloon, and the XEN balloon. This can quickly result in a lot of memory resources, whereby the actual resource boundaries are not of interest (e.g., it might be relevant