search for: page_discard

...page. + * A guest that accesses such a discarded page gets a special + * discard fault. + * - page_set_stable_if_present: + * The page state is set to stable if the page has not been discarded + * by the host. The check and the state change have to be done + * atomically. + * - page_discarded: + * Returns true if the page has been discarded by the host. */ +#define page_host_discards() (0) #define page_set_unused(_page,_order) do { } while (0) #define page_set_stable(_page,_order) do { } while (0) +#define page_set_volatile(_page) do { } while (0) +#define page_set_stab...

...page. + * A guest that accesses such a discarded page gets a special + * discard fault. + * - page_set_stable_if_present: + * The page state is set to stable if the page has not been discarded + * by the host. The check and the state change have to be done + * atomically. + * - page_discarded: + * Returns true if the page has been discarded by the host. */ +#define page_host_discards() (0) #define page_set_unused(_page,_order) do { } while (0) #define page_set_stable(_page,_order) do { } while (0) +#define page_set_volatile(_page) do { } while (0) +#define page_set_stab...

Greetings, after Carsten pitched CMM2 on the kvm mini summit here is a repost of version 5 of the guest page hinting patches. The code is still the same but has been adapted to the latest git level. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.

Greetings, after Carsten pitched CMM2 on the kvm mini summit here is a repost of version 5 of the guest page hinting patches. The code is still the same but has been adapted to the latest git level. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.

After way to many months here is the fifth version of the guest page hinting patches. Compared to version four a few improvements have been added: - Avoid page_host_discards() calls outside of page-states.h - The discard list is now implemented via the page_free_discarded hook and architecture specific code. - PG_state_change page flag has been replaced with architecture specficic

After way to many months here is the fifth version of the guest page hinting patches. Compared to version four a few improvements have been added: - Avoid page_host_discards() calls outside of page-states.h - The discard list is now implemented via the page_free_discarded hook and architecture specific code. - PG_state_change page flag has been replaced with architecture specficic

...discards() (0) #define page_set_unused(_page,_order) do { } while (0) #define page_set_stable(_page,_order) do { } while (0) -#define page_set_volatile(_page) do { } while (0) +#define page_set_volatile(_page,_writable) do { } while (0) #define page_set_stable_if_present(_page) (1) #define page_discarded(_page) (0) @@ -63,6 +63,12 @@ * from the LRU list and the radix tree of its mapping. * page_discard uses page_unmap_all to remove all page table * entries for a page. + * - page_check_writable: + * Checks if the page states needs to be adapted because a new + * writa...

...discards() (0) #define page_set_unused(_page,_order) do { } while (0) #define page_set_stable(_page,_order) do { } while (0) -#define page_set_volatile(_page) do { } while (0) +#define page_set_volatile(_page,_writable) do { } while (0) #define page_set_stable_if_present(_page) (1) #define page_discarded(_page) (0) @@ -63,6 +63,12 @@ * from the LRU list and the radix tree of its mapping. * page_discard uses page_unmap_all to remove all page table * entries for a page. + * - page_check_writable: + * Checks if the page states needs to be adapted because a new + * writa...

...s) { - if (do_wp_page(mm, vma, address, - page_table, pmd, ptl, pte) == VM_FAULT_OOM) + int rc = do_wp_page(mm, vma, address, page_table, + pmd, ptl, pte); + if (page_host_discards() && rc == VM_FAULT_MAJOR) + /* + * A discard removed the page, and do_wp_page called + * page_discard which removed the pte as well. + * handle_pte_fault needs to be repeated. + */ + ret = VM_FAULT_MINOR; + else if (rc == VM_FAULT_OOM) ret = VM_FAULT_OOM; goto out; } diff -urpN linux-2.6/mm/page-discard.c linux-2.6-patched/mm/page-discard.c --- linux-2.6/mm/page-discard.c 2006-09-...

...s) { - if (do_wp_page(mm, vma, address, - page_table, pmd, ptl, pte) == VM_FAULT_OOM) + int rc = do_wp_page(mm, vma, address, page_table, + pmd, ptl, pte); + if (page_host_discards() && rc == VM_FAULT_MAJOR) + /* + * A discard removed the page, and do_wp_page called + * page_discard which removed the pte as well. + * handle_pte_fault needs to be repeated. + */ + ret = VM_FAULT_MINOR; + else if (rc == VM_FAULT_OOM) ret = VM_FAULT_OOM; goto out; } diff -urpN linux-2.6/mm/page-discard.c linux-2.6-patched/mm/page-discard.c --- linux-2.6/mm/page-discard.c 2006-09-...

...6/arch/s390/Kconfig 2006-09-01 12:49:36.000000000 +0200 +++ linux-2.6-patched/arch/s390/Kconfig 2006-09-01 12:50:25.000000000 +0200 @@ -463,8 +463,13 @@ config KEXEC current kernel, and to start another kernel. It is like a reboot but is independent of hardware/microcode support. +config PAGE_DISCARD_LIST + bool + default n + config PAGE_STATES bool "Enable support for guest page hinting." + select PAGE_DISCARD_LIST endmenu diff -urpN linux-2.6/arch/s390/kernel/traps.c linux-2.6-patched/arch/s390/kernel/traps.c --- linux-2.6/arch/s390/kernel/traps.c 2006-09-01 12:49:25.0000000...

...6/arch/s390/Kconfig 2006-09-01 12:49:36.000000000 +0200 +++ linux-2.6-patched/arch/s390/Kconfig 2006-09-01 12:50:25.000000000 +0200 @@ -463,8 +463,13 @@ config KEXEC current kernel, and to start another kernel. It is like a reboot but is independent of hardware/microcode support. +config PAGE_DISCARD_LIST + bool + default n + config PAGE_STATES bool "Enable support for guest page hinting." + select PAGE_DISCARD_LIST endmenu diff -urpN linux-2.6/arch/s390/kernel/traps.c linux-2.6-patched/arch/s390/kernel/traps.c --- linux-2.6/arch/s390/kernel/traps.c 2006-09-01 12:49:25.0000000...

Greetings, the circus is back in town -- another version of the guest page hinting patches. The patches differ from version 6 only in the kernel version, they apply against 2.6.29. My short sniff test showed that the code is still working as expected. To recap (you can skip this if you read the boiler plate of the last version of the patches): The main benefit for guest page hinting vs. the

Greetings, the circus is back in town -- another version of the guest page hinting patches. The patches differ from version 6 only in the kernel version, they apply against 2.6.29. My short sniff test showed that the code is still working as expected. To recap (you can skip this if you read the boiler plate of the last version of the patches): The main benefit for guest page hinting vs. the

Greetings, the circus is back in town -- another version of the guest page hinting patches. The patches differ from version 6 only in the kernel version, they apply against 2.6.29. My short sniff test showed that the code is still working as expected. To recap (you can skip this if you read the boiler plate of the last version of the patches): The main benefit for guest page hinting vs. the

...Resets the page state after the last writable page table entry * refering to the page has been removed. + * - page_shrink_discards: + * Frees all pages that free_hot_cold_page has put on the list of + * discarded pages. */ extern void page_unmap_all(struct page *page); extern void page_discard(struct page *page); +extern unsigned long page_shrink_discards(void); static inline int page_make_stable(struct page *page) { diff -urpN linux-2.6/mm/page_alloc.c linux-2.6-patched/mm/page_alloc.c --- linux-2.6/mm/page_alloc.c 2006-09-01 12:50:25.000000000 +0200 +++ linux-2.6-patched/mm/page_al...

...Resets the page state after the last writable page table entry * refering to the page has been removed. + * - page_shrink_discards: + * Frees all pages that free_hot_cold_page has put on the list of + * discarded pages. */ extern void page_unmap_all(struct page *page); extern void page_discard(struct page *page); +extern unsigned long page_shrink_discards(void); static inline int page_make_stable(struct page *page) { diff -urpN linux-2.6/mm/page_alloc.c linux-2.6-patched/mm/page_alloc.c --- linux-2.6/mm/page_alloc.c 2006-09-01 12:50:25.000000000 +0200 +++ linux-2.6-patched/mm/page_al...