search for: vm_bug_on

...e = NULL; >>> int flush_needed = 1; >>> + bool is_anon = false; >>> >>> if (pmd_present(orig_pmd)) { >>> page = pmd_page(orig_pmd); >>> + is_anon = PageAnon(page); >>> page_remove_rmap(page, true); >>> VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); >>> VM_BUG_ON_PAGE(!PageHead(page), page); >>> } else if (thp_migration_supported()) { >>> swp_entry_t entry; >>> >>> - VM_BUG_ON(!is_pmd_migration_entry(orig_pmd)); >>> entry = pmd_to...

...;>> + bool is_anon = false; >>>>> >>>>> if (pmd_present(orig_pmd)) { >>>>> page = pmd_page(orig_pmd); >>>>> + is_anon = PageAnon(page); >>>>> page_remove_rmap(page, true); >>>>> VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); >>>>> VM_BUG_ON_PAGE(!PageHead(page), page); >>>>> } else if (thp_migration_supported()) { >>>>> swp_entry_t entry; >>>>> >>>>> - VM_BUG_ON(!is_pmd_migration_entry(o...

...struct vm_area_struct *vma, > } else { > struct page *page = NULL; > int flush_needed = 1; > + bool is_anon = false; > > if (pmd_present(orig_pmd)) { > page = pmd_page(orig_pmd); > + is_anon = PageAnon(page); > page_remove_rmap(page, true); > VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); > VM_BUG_ON_PAGE(!PageHead(page), page); > } else if (thp_migration_supported()) { > swp_entry_t entry; > > - VM_BUG_ON(!is_pmd_migration_entry(orig_pmd)); > entry = pmd_to_swp_entry(orig_pmd); > - page = pfn_to_page(sw...

...{ >> struct page *page = NULL; >> int flush_needed = 1; >> + bool is_anon = false; >> >> if (pmd_present(orig_pmd)) { >> page = pmd_page(orig_pmd); >> + is_anon = PageAnon(page); >> page_remove_rmap(page, true); >> VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); >> VM_BUG_ON_PAGE(!PageHead(page), page); >> } else if (thp_migration_supported()) { >> swp_entry_t entry; >> >> - VM_BUG_ON(!is_pmd_migration_entry(orig_pmd)); >> entry = pmd_to_swp_entry(orig_pmd); &g...

Hi everyone, Here are new releases of bio-cgroup. Changes from the previous version are as follows: - Accurate dirty-page tracking Support migrating pages between bio-cgroups with minimum overhead, but I think such a situation is quite rare. - Fix a bug of swapcache page handling Sometimes, "bad page state" is occurred since the memory controller has temporarily changed the

Hi everyone, Here are new releases of bio-cgroup. Changes from the previous version are as follows: - Accurate dirty-page tracking Support migrating pages between bio-cgroups with minimum overhead, but I think such a situation is quite rare. - Fix a bug of swapcache page handling Sometimes, "bad page state" is occurred since the memory controller has temporarily changed the

Hi everyone, Here are new releases of bio-cgroup. Changes from the previous version are as follows: - Accurate dirty-page tracking Support migrating pages between bio-cgroups with minimum overhead, but I think such a situation is quite rare. - Fix a bug of swapcache page handling Sometimes, "bad page state" is occurred since the memory controller has temporarily changed the

...page { /* * Drop a ref, return true if the refcount fell to zero (the page has no users) + * put_page_testzero checks if the page can be made volatile if the page + * still has users and guest page hinting is enabled. */ static inline int put_page_testzero(struct page *page) { + int ret; VM_BUG_ON(atomic_read(&page->_count) == 0); - return atomic_dec_and_test(&page->_count); + ret = atomic_dec_and_test(&page->_count); + if (!ret) + page_make_volatile(page, 1); + return ret; } /* diff -urpN linux-2.6/include/linux/page-flags.h linux-2.6-patched/include/linux/page-fla...

...page { /* * Drop a ref, return true if the refcount fell to zero (the page has no users) + * put_page_testzero checks if the page can be made volatile if the page + * still has users and guest page hinting is enabled. */ static inline int put_page_testzero(struct page *page) { + int ret; VM_BUG_ON(atomic_read(&page->_count) == 0); - return atomic_dec_and_test(&page->_count); + ret = atomic_dec_and_test(&page->_count); + if (!ret) + page_make_volatile(page, 1); + return ret; } /* diff -urpN linux-2.6/include/linux/page-flags.h linux-2.6-patched/include/linux/page-fla...

...lush_needed = 1; >>>> + bool is_anon = false; >>>> >>>> if (pmd_present(orig_pmd)) { >>>> page = pmd_page(orig_pmd); >>>> + is_anon = PageAnon(page); >>>> page_remove_rmap(page, true); >>>> VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); >>>> VM_BUG_ON_PAGE(!PageHead(page), page); >>>> } else if (thp_migration_supported()) { >>>> swp_entry_t entry; >>>> >>>> - VM_BUG_ON(!is_pmd_migration_entry(orig_pmd)); >>&...

...o steps, perhaps? besides, it is more intuitive (at least to me) when 'offset' shortened to 'offt', not 'ofs'. -ss > { > - unsigned long obj; > + int i; > + unsigned long ofs; > + struct page *cursor; > + int nr_page; > > - if (!page) { > - VM_BUG_ON(obj_idx); > - return NULL; > - } > + ofs = obj_idx * class->size; > + cursor = first_page; > + nr_page = ofs >> PAGE_SHIFT; > > - obj = page_to_pfn(page) << OBJ_INDEX_BITS; > - obj |= ((obj_idx) & OBJ_INDEX_MASK); > - obj <<= OBJ_TAG_BITS; >...

...o steps, perhaps? besides, it is more intuitive (at least to me) when 'offset' shortened to 'offt', not 'ofs'. -ss > { > - unsigned long obj; > + int i; > + unsigned long ofs; > + struct page *cursor; > + int nr_page; > > - if (!page) { > - VM_BUG_ON(obj_idx); > - return NULL; > - } > + ofs = obj_idx * class->size; > + cursor = first_page; > + nr_page = ofs >> PAGE_SHIFT; > > - obj = page_to_pfn(page) << OBJ_INDEX_BITS; > - obj |= ((obj_idx) & OBJ_INDEX_MASK); > - obj <<= OBJ_TAG_BITS; >...

There are many BUG_ON in zsmalloc.c which is not recommened so change them as alternatives. Normal rule is as follows: 1. avoid BUG_ON if possible. Instead, use VM_BUG_ON or VM_BUG_ON_PAGE 2. use VM_BUG_ON_PAGE if we need to see struct page's fields 3. use those assertion in primitive functions so higher functions can rely on the assertion in the primitive function. 4. Don't use assertion if following instruction can trigger Oops Signed-off-by: Minchan Kim...

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

...ent(orig_pmd)) { > >>>>> page = pmd_page(orig_pmd); > >>>>> + is_anon = PageAnon(page); > >>>>> page_remove_rmap(page, true); > >>>>> VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); > >>>>> VM_BUG_ON_PAGE(!PageHead(page), page); > >>>>> } else if (thp_migration_supported()) { > >>>>> swp_entry_t entry; > >>...

Hi all, With this series of patches, you can determine the owners of any type of I/Os. I ported the previous version to linux-2.6.26-rc2-mm1. This makes dm-ioband -- I/O bandwidth controller -- be able to control the Block I/O bandwidths even when it accepts delayed write requests. Dm-ioband can find the owner cgroup of each request. It is also possible that OpenVz team and NEC Uchida-san team

Hi all, With this series of patches, you can determine the owners of any type of I/Os. I ported the previous version to linux-2.6.26-rc2-mm1. This makes dm-ioband -- I/O bandwidth controller -- be able to control the Block I/O bandwidths even when it accepts delayed write requests. Dm-ioband can find the owner cgroup of each request. It is also possible that OpenVz team and NEC Uchida-san team