Re: [PATCH v4 1/3] memory-failure: export page_type and action result

From: Naoya Horiguchi
Date: Wed May 06 2015 - 21:13:31 EST

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On Mon, Apr 20, 2015 at 04:44:38PM +0800, Xie XiuQi wrote:
> Export 'outcome' and 'action_page_type' to mm.h, so we could use
> this enums outside.
>
> This patch is preparation for adding trace events for memory-failure
> recovery action.
>
> Signed-off-by: Xie XiuQi <xiexiuqi@xxxxxxxxxx>

Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>

> ---
> include/linux/mm.h | 34 +++++++++++
> mm/memory-failure.c | 168 +++++++++++++++++++++-------------------------------
> 2 files changed, 101 insertions(+), 101 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 8b08607..8413615 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2152,6 +2152,40 @@ extern void shake_page(struct page *p, int access);
> extern atomic_long_t num_poisoned_pages;
> extern int soft_offline_page(struct page *page, int flags);
>
> +
> +/*
> + * Error handlers for various types of pages.
> + */
> +enum mf_outcome {
> + MF_IGNORED, /* Error: cannot be handled */
> + MF_FAILED, /* Error: handling failed */
> + MF_DELAYED, /* Will be handled later */
> + MF_RECOVERED, /* Successfully recovered */
> +};
> +
> +enum mf_action_page_type {
> + MF_MSG_KERNEL,
> + MF_MSG_KERNEL_HIGH_ORDER,
> + MF_MSG_SLAB,
> + MF_MSG_DIFFERENT_COMPOUND,
> + MF_MSG_POISONED_HUGE,
> + MF_MSG_HUGE,
> + MF_MSG_FREE_HUGE,
> + MF_MSG_UNMAP_FAILED,
> + MF_MSG_DIRTY_SWAPCACHE,
> + MF_MSG_CLEAN_SWAPCACHE,
> + MF_MSG_DIRTY_MLOCKED_LRU,
> + MF_MSG_CLEAN_MLOCKED_LRU,
> + MF_MSG_DIRTY_UNEVICTABLE_LRU,
> + MF_MSG_CLEAN_UNEVICTABLE_LRU,
> + MF_MSG_DIRTY_LRU,
> + MF_MSG_CLEAN_LRU,
> + MF_MSG_TRUNCATED_LRU,
> + MF_MSG_BUDDY,
> + MF_MSG_BUDDY_2ND,
> + MF_MSG_UNKNOWN,
> +};
> +
> #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
> extern void clear_huge_page(struct page *page,
> unsigned long addr,
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index d9359b7..6f5748d 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -503,68 +503,34 @@ static void collect_procs(struct page *page, struct list_head *tokill,
> kfree(tk);
> }
>
> -/*
> - * Error handlers for various types of pages.
> - */
> -
> -enum outcome {
> - IGNORED, /* Error: cannot be handled */
> - FAILED, /* Error: handling failed */
> - DELAYED, /* Will be handled later */
> - RECOVERED, /* Successfully recovered */
> -};
> -
> static const char *action_name[] = {
> - [IGNORED] = "Ignored",
> - [FAILED] = "Failed",
> - [DELAYED] = "Delayed",
> - [RECOVERED] = "Recovered",
> -};
> -
> -enum action_page_type {
> - MSG_KERNEL,
> - MSG_KERNEL_HIGH_ORDER,
> - MSG_SLAB,
> - MSG_DIFFERENT_COMPOUND,
> - MSG_POISONED_HUGE,
> - MSG_HUGE,
> - MSG_FREE_HUGE,
> - MSG_UNMAP_FAILED,
> - MSG_DIRTY_SWAPCACHE,
> - MSG_CLEAN_SWAPCACHE,
> - MSG_DIRTY_MLOCKED_LRU,
> - MSG_CLEAN_MLOCKED_LRU,
> - MSG_DIRTY_UNEVICTABLE_LRU,
> - MSG_CLEAN_UNEVICTABLE_LRU,
> - MSG_DIRTY_LRU,
> - MSG_CLEAN_LRU,
> - MSG_TRUNCATED_LRU,
> - MSG_BUDDY,
> - MSG_BUDDY_2ND,
> - MSG_UNKNOWN,
> + [MF_IGNORED] = "Ignored",
> + [MF_FAILED] = "Failed",
> + [MF_DELAYED] = "Delayed",
> + [MF_RECOVERED] = "Recovered",
> };
>
> static const char * const action_page_types[] = {
> - [MSG_KERNEL] = "reserved kernel page",
> - [MSG_KERNEL_HIGH_ORDER] = "high-order kernel page",
> - [MSG_SLAB] = "kernel slab page",
> - [MSG_DIFFERENT_COMPOUND] = "different compound page after locking",
> - [MSG_POISONED_HUGE] = "huge page already hardware poisoned",
> - [MSG_HUGE] = "huge page",
> - [MSG_FREE_HUGE] = "free huge page",
> - [MSG_UNMAP_FAILED] = "unmapping failed page",
> - [MSG_DIRTY_SWAPCACHE] = "dirty swapcache page",
> - [MSG_CLEAN_SWAPCACHE] = "clean swapcache page",
> - [MSG_DIRTY_MLOCKED_LRU] = "dirty mlocked LRU page",
> - [MSG_CLEAN_MLOCKED_LRU] = "clean mlocked LRU page",
> - [MSG_DIRTY_UNEVICTABLE_LRU] = "dirty unevictable LRU page",
> - [MSG_CLEAN_UNEVICTABLE_LRU] = "clean unevictable LRU page",
> - [MSG_DIRTY_LRU] = "dirty LRU page",
> - [MSG_CLEAN_LRU] = "clean LRU page",
> - [MSG_TRUNCATED_LRU] = "already truncated LRU page",
> - [MSG_BUDDY] = "free buddy page",
> - [MSG_BUDDY_2ND] = "free buddy page (2nd try)",
> - [MSG_UNKNOWN] = "unknown page",
> + [MF_MSG_KERNEL] = "reserved kernel page",
> + [MF_MSG_KERNEL_HIGH_ORDER] = "high-order kernel page",
> + [MF_MSG_SLAB] = "kernel slab page",
> + [MF_MSG_DIFFERENT_COMPOUND] = "different compound page after locking",
> + [MF_MSG_POISONED_HUGE] = "huge page already hardware poisoned",
> + [MF_MSG_HUGE] = "huge page",
> + [MF_MSG_FREE_HUGE] = "free huge page",
> + [MF_MSG_UNMAP_FAILED] = "unmapping failed page",
> + [MF_MSG_DIRTY_SWAPCACHE] = "dirty swapcache page",
> + [MF_MSG_CLEAN_SWAPCACHE] = "clean swapcache page",
> + [MF_MSG_DIRTY_MLOCKED_LRU] = "dirty mlocked LRU page",
> + [MF_MSG_CLEAN_MLOCKED_LRU] = "clean mlocked LRU page",
> + [MF_MSG_DIRTY_UNEVICTABLE_LRU] = "dirty unevictable LRU page",
> + [MF_MSG_CLEAN_UNEVICTABLE_LRU] = "clean unevictable LRU page",
> + [MF_MSG_DIRTY_LRU] = "dirty LRU page",
> + [MF_MSG_CLEAN_LRU] = "clean LRU page",
> + [MF_MSG_TRUNCATED_LRU] = "already truncated LRU page",
> + [MF_MSG_BUDDY] = "free buddy page",
> + [MF_MSG_BUDDY_2ND] = "free buddy page (2nd try)",
> + [MF_MSG_UNKNOWN] = "unknown page",
> };
>
> /*
> @@ -598,7 +564,7 @@ static int delete_from_lru_cache(struct page *p)
> */
> static int me_kernel(struct page *p, unsigned long pfn)
> {
> - return IGNORED;
> + return MF_IGNORED;
> }
>
> /*
> @@ -607,7 +573,7 @@ static int me_kernel(struct page *p, unsigned long pfn)
> static int me_unknown(struct page *p, unsigned long pfn)
> {
> printk(KERN_ERR "MCE %#lx: Unknown page state\n", pfn);
> - return FAILED;
> + return MF_FAILED;
> }
>
> /*
> @@ -616,7 +582,7 @@ static int me_unknown(struct page *p, unsigned long pfn)
> static int me_pagecache_clean(struct page *p, unsigned long pfn)
> {
> int err;
> - int ret = FAILED;
> + int ret = MF_FAILED;
> struct address_space *mapping;
>
> delete_from_lru_cache(p);
> @@ -626,7 +592,7 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
> * should be the one m_f() holds.
> */
> if (PageAnon(p))
> - return RECOVERED;
> + return MF_RECOVERED;
>
> /*
> * Now truncate the page in the page cache. This is really
> @@ -640,7 +606,7 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
> /*
> * Page has been teared down in the meanwhile
> */
> - return FAILED;
> + return MF_FAILED;
> }
>
> /*
> @@ -657,7 +623,7 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
> !try_to_release_page(p, GFP_NOIO)) {
> pr_info("MCE %#lx: failed to release buffers\n", pfn);
> } else {
> - ret = RECOVERED;
> + ret = MF_RECOVERED;
> }
> } else {
> /*
> @@ -665,7 +631,7 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
> * This fails on dirty or anything with private pages
> */
> if (invalidate_inode_page(p))
> - ret = RECOVERED;
> + ret = MF_RECOVERED;
> else
> printk(KERN_INFO "MCE %#lx: Failed to invalidate\n",
> pfn);
> @@ -751,9 +717,9 @@ static int me_swapcache_dirty(struct page *p, unsigned long pfn)
> ClearPageUptodate(p);
>
> if (!delete_from_lru_cache(p))
> - return DELAYED;
> + return MF_DELAYED;
> else
> - return FAILED;
> + return MF_FAILED;
> }
>
> static int me_swapcache_clean(struct page *p, unsigned long pfn)
> @@ -761,9 +727,9 @@ static int me_swapcache_clean(struct page *p, unsigned long pfn)
> delete_from_swap_cache(p);
>
> if (!delete_from_lru_cache(p))
> - return RECOVERED;
> + return MF_RECOVERED;
> else
> - return FAILED;
> + return MF_FAILED;
> }
>
> /*
> @@ -789,9 +755,9 @@ static int me_huge_page(struct page *p, unsigned long pfn)
> if (!(page_mapping(hpage) || PageAnon(hpage))) {
> res = dequeue_hwpoisoned_huge_page(hpage);
> if (!res)
> - return RECOVERED;
> + return MF_RECOVERED;
> }
> - return DELAYED;
> + return MF_DELAYED;
> }
>
> /*
> @@ -823,10 +789,10 @@ static int me_huge_page(struct page *p, unsigned long pfn)
> static struct page_state {
> unsigned long mask;
> unsigned long res;
> - enum action_page_type type;
> + enum mf_action_page_type type;
> int (*action)(struct page *p, unsigned long pfn);
> } error_states[] = {
> - { reserved, reserved, MSG_KERNEL, me_kernel },
> + { reserved, reserved, MF_MSG_KERNEL, me_kernel },
> /*
> * free pages are specially detected outside this table:
> * PG_buddy pages only make a small fraction of all free pages.
> @@ -837,31 +803,31 @@ static struct page_state {
> * currently unused objects without touching them. But just
> * treat it as standard kernel for now.
> */
> - { slab, slab, MSG_SLAB, me_kernel },
> + { slab, slab, MF_MSG_SLAB, me_kernel },
>
> #ifdef CONFIG_PAGEFLAGS_EXTENDED
> - { head, head, MSG_HUGE, me_huge_page },
> - { tail, tail, MSG_HUGE, me_huge_page },
> + { head, head, MF_MSG_HUGE, me_huge_page },
> + { tail, tail, MF_MSG_HUGE, me_huge_page },
> #else
> - { compound, compound, MSG_HUGE, me_huge_page },
> + { compound, compound, MF_MSG_HUGE, me_huge_page },
> #endif
>
> - { sc|dirty, sc|dirty, MSG_DIRTY_SWAPCACHE, me_swapcache_dirty },
> - { sc|dirty, sc, MSG_CLEAN_SWAPCACHE, me_swapcache_clean },
> + { sc|dirty, sc|dirty, MF_MSG_DIRTY_SWAPCACHE, me_swapcache_dirty },
> + { sc|dirty, sc, MF_MSG_CLEAN_SWAPCACHE, me_swapcache_clean },
>
> - { mlock|dirty, mlock|dirty, MSG_DIRTY_MLOCKED_LRU, me_pagecache_dirty },
> - { mlock|dirty, mlock, MSG_CLEAN_MLOCKED_LRU, me_pagecache_clean },
> + { mlock|dirty, mlock|dirty, MF_MSG_DIRTY_MLOCKED_LRU, me_pagecache_dirty },
> + { mlock|dirty, mlock, MF_MSG_CLEAN_MLOCKED_LRU, me_pagecache_clean },
>
> - { unevict|dirty, unevict|dirty, MSG_DIRTY_UNEVICTABLE_LRU, me_pagecache_dirty },
> - { unevict|dirty, unevict, MSG_CLEAN_UNEVICTABLE_LRU, me_pagecache_clean },
> + { unevict|dirty, unevict|dirty, MF_MSG_DIRTY_UNEVICTABLE_LRU, me_pagecache_dirty },
> + { unevict|dirty, unevict, MF_MSG_CLEAN_UNEVICTABLE_LRU, me_pagecache_clean },
>
> - { lru|dirty, lru|dirty, MSG_DIRTY_LRU, me_pagecache_dirty },
> - { lru|dirty, lru, MSG_CLEAN_LRU, me_pagecache_clean },
> + { lru|dirty, lru|dirty, MF_MSG_DIRTY_LRU, me_pagecache_dirty },
> + { lru|dirty, lru, MF_MSG_CLEAN_LRU, me_pagecache_clean },
>
> /*
> * Catchall entry: must be at end.
> */
> - { 0, 0, MSG_UNKNOWN, me_unknown },
> + { 0, 0, MF_MSG_UNKNOWN, me_unknown },
> };
>
> #undef dirty
> @@ -881,7 +847,7 @@ static struct page_state {
> * "Dirty/Clean" indication is not 100% accurate due to the possibility of
> * setting PG_dirty outside page lock. See also comment above set_page_dirty().
> */
> -static void action_result(unsigned long pfn, enum action_page_type type, int result)
> +static void action_result(unsigned long pfn, enum mf_action_page_type type, int result)
> {
> pr_err("MCE %#lx: recovery action for %s: %s\n",
> pfn, action_page_types[type], action_name[result]);
> @@ -896,13 +862,13 @@ static int page_action(struct page_state *ps, struct page *p,
> result = ps->action(p, pfn);
>
> count = page_count(p) - 1;
> - if (ps->action == me_swapcache_dirty && result == DELAYED)
> + if (ps->action == me_swapcache_dirty && result == MF_DELAYED)
> count--;
> if (count != 0) {
> printk(KERN_ERR
> "MCE %#lx: %s still referenced by %d users\n",
> pfn, action_page_types[ps->type], count);
> - result = FAILED;
> + result = MF_FAILED;
> }
> action_result(pfn, ps->type, result);
>
> @@ -911,7 +877,7 @@ static int page_action(struct page_state *ps, struct page *p,
> * Could adjust zone counters here to correct for the missing page.
> */
>
> - return (result == RECOVERED || result == DELAYED) ? 0 : -EBUSY;
> + return (result == MF_RECOVERED || result == MF_DELAYED) ? 0 : -EBUSY;
> }
>
> /*
> @@ -1152,7 +1118,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> if (!(flags & MF_COUNT_INCREASED) &&
> !get_page_unless_zero(hpage)) {
> if (is_free_buddy_page(p)) {
> - action_result(pfn, MSG_BUDDY, DELAYED);
> + action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
> return 0;
> } else if (PageHuge(hpage)) {
> /*
> @@ -1169,12 +1135,12 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> }
> set_page_hwpoison_huge_page(hpage);
> res = dequeue_hwpoisoned_huge_page(hpage);
> - action_result(pfn, MSG_FREE_HUGE,
> - res ? IGNORED : DELAYED);
> + action_result(pfn, MF_MSG_FREE_HUGE,
> + res ? MF_IGNORED : MF_DELAYED);
> unlock_page(hpage);
> return res;
> } else {
> - action_result(pfn, MSG_KERNEL_HIGH_ORDER, IGNORED);
> + action_result(pfn, MF_MSG_KERNEL_HIGH_ORDER, MF_IGNORED);
> return -EBUSY;
> }
> }
> @@ -1196,10 +1162,10 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> */
> if (is_free_buddy_page(p)) {
> if (flags & MF_COUNT_INCREASED)
> - action_result(pfn, MSG_BUDDY, DELAYED);
> + action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
> else
> - action_result(pfn, MSG_BUDDY_2ND,
> - DELAYED);
> + action_result(pfn, MF_MSG_BUDDY_2ND,
> + MF_DELAYED);
> return 0;
> }
> }
> @@ -1212,7 +1178,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> * If this happens just bail out.
> */
> if (compound_head(p) != hpage) {
> - action_result(pfn, MSG_DIFFERENT_COMPOUND, IGNORED);
> + action_result(pfn, MF_MSG_DIFFERENT_COMPOUND, MF_IGNORED);
> res = -EBUSY;
> goto out;
> }
> @@ -1252,7 +1218,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> * on the head page to show that the hugepage is hwpoisoned
> */
> if (PageHuge(p) && PageTail(p) && TestSetPageHWPoison(hpage)) {
> - action_result(pfn, MSG_POISONED_HUGE, IGNORED);
> + action_result(pfn, MF_MSG_POISONED_HUGE, MF_IGNORED);
> unlock_page(hpage);
> put_page(hpage);
> return 0;
> @@ -1281,7 +1247,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> */
> if (hwpoison_user_mappings(p, pfn, trapno, flags, &hpage)
> != SWAP_SUCCESS) {
> - action_result(pfn, MSG_UNMAP_FAILED, IGNORED);
> + action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
> res = -EBUSY;
> goto out;
> }
> @@ -1290,7 +1256,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
> * Torn down by someone else?
> */
> if (PageLRU(p) && !PageSwapCache(p) && p->mapping == NULL) {
> - action_result(pfn, MSG_TRUNCATED_LRU, IGNORED);
> + action_result(pfn, MF_MSG_TRUNCATED_LRU, MF_IGNORED);
> res = -EBUSY;
> goto out;
> }
> --
> 1.8.3.1
> --
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