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mm/memory-failure.c: define page types for action_result() in one place
This cleanup patch moves all strings passed to action_result() into a singl= e array action_page_type so that a reader can easily find which kind of actio= n results are possible. And this patch also fixes the odd lines to be printed out, like "unknown page state page" or "free buddy, 2nd try page". [akpm@linux-foundation.org: rename messages, per David] [akpm@linux-foundation.org: s/DIRTY_UNEVICTABLE_LRU/CLEAN_UNEVICTABLE_LRU', per Andi] Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: "Xie XiuQi" <xiexiuqi@huawei.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Chen Gong <gong.chen@linux.intel.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi
Linus Torvalds
parent
2564f683d1
commit
64d37a2baf
@ -521,6 +521,52 @@ static const char *action_name[] = {
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[RECOVERED] = "Recovered",
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};
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enum action_page_type {
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MSG_KERNEL,
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MSG_KERNEL_HIGH_ORDER,
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MSG_SLAB,
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MSG_DIFFERENT_COMPOUND,
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MSG_POISONED_HUGE,
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MSG_HUGE,
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MSG_FREE_HUGE,
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MSG_UNMAP_FAILED,
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MSG_DIRTY_SWAPCACHE,
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MSG_CLEAN_SWAPCACHE,
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MSG_DIRTY_MLOCKED_LRU,
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MSG_CLEAN_MLOCKED_LRU,
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MSG_DIRTY_UNEVICTABLE_LRU,
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MSG_CLEAN_UNEVICTABLE_LRU,
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MSG_DIRTY_LRU,
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MSG_CLEAN_LRU,
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MSG_TRUNCATED_LRU,
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MSG_BUDDY,
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MSG_BUDDY_2ND,
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MSG_UNKNOWN,
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};
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static const char * const action_page_types[] = {
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[MSG_KERNEL] = "reserved kernel page",
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[MSG_KERNEL_HIGH_ORDER] = "high-order kernel page",
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[MSG_SLAB] = "kernel slab page",
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[MSG_DIFFERENT_COMPOUND] = "different compound page after locking",
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[MSG_POISONED_HUGE] = "huge page already hardware poisoned",
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[MSG_HUGE] = "huge page",
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[MSG_FREE_HUGE] = "free huge page",
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[MSG_UNMAP_FAILED] = "unmapping failed page",
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[MSG_DIRTY_SWAPCACHE] = "dirty swapcache page",
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[MSG_CLEAN_SWAPCACHE] = "clean swapcache page",
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[MSG_DIRTY_MLOCKED_LRU] = "dirty mlocked LRU page",
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[MSG_CLEAN_MLOCKED_LRU] = "clean mlocked LRU page",
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[MSG_DIRTY_UNEVICTABLE_LRU] = "dirty unevictable LRU page",
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[MSG_CLEAN_UNEVICTABLE_LRU] = "clean unevictable LRU page",
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[MSG_DIRTY_LRU] = "dirty LRU page",
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[MSG_CLEAN_LRU] = "clean LRU page",
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[MSG_TRUNCATED_LRU] = "already truncated LRU page",
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[MSG_BUDDY] = "free buddy page",
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[MSG_BUDDY_2ND] = "free buddy page (2nd try)",
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[MSG_UNKNOWN] = "unknown page",
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};
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/*
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* XXX: It is possible that a page is isolated from LRU cache,
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* and then kept in swap cache or failed to remove from page cache.
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@ -777,10 +823,10 @@ static int me_huge_page(struct page *p, unsigned long pfn)
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static struct page_state {
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unsigned long mask;
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unsigned long res;
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char *msg;
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enum action_page_type type;
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int (*action)(struct page *p, unsigned long pfn);
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} error_states[] = {
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{ reserved, reserved, "reserved kernel", me_kernel },
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{ reserved, reserved, MSG_KERNEL, me_kernel },
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/*
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* free pages are specially detected outside this table:
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* PG_buddy pages only make a small fraction of all free pages.
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@ -791,31 +837,31 @@ static struct page_state {
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* currently unused objects without touching them. But just
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* treat it as standard kernel for now.
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*/
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{ slab, slab, "kernel slab", me_kernel },
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{ slab, slab, MSG_SLAB, me_kernel },
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#ifdef CONFIG_PAGEFLAGS_EXTENDED
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{ head, head, "huge", me_huge_page },
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{ tail, tail, "huge", me_huge_page },
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{ head, head, MSG_HUGE, me_huge_page },
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{ tail, tail, MSG_HUGE, me_huge_page },
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#else
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{ compound, compound, "huge", me_huge_page },
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{ compound, compound, MSG_HUGE, me_huge_page },
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#endif
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{ sc|dirty, sc|dirty, "dirty swapcache", me_swapcache_dirty },
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{ sc|dirty, sc, "clean swapcache", me_swapcache_clean },
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{ sc|dirty, sc|dirty, MSG_DIRTY_SWAPCACHE, me_swapcache_dirty },
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{ sc|dirty, sc, MSG_CLEAN_SWAPCACHE, me_swapcache_clean },
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{ mlock|dirty, mlock|dirty, "dirty mlocked LRU", me_pagecache_dirty },
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{ mlock|dirty, mlock, "clean mlocked LRU", me_pagecache_clean },
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{ mlock|dirty, mlock|dirty, MSG_DIRTY_MLOCKED_LRU, me_pagecache_dirty },
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{ mlock|dirty, mlock, MSG_CLEAN_MLOCKED_LRU, me_pagecache_clean },
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{ unevict|dirty, unevict|dirty, "dirty unevictable LRU", me_pagecache_dirty },
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{ unevict|dirty, unevict, "clean unevictable LRU", me_pagecache_clean },
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{ unevict|dirty, unevict|dirty, MSG_DIRTY_UNEVICTABLE_LRU, me_pagecache_dirty },
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{ unevict|dirty, unevict, MSG_CLEAN_UNEVICTABLE_LRU, me_pagecache_clean },
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{ lru|dirty, lru|dirty, "dirty LRU", me_pagecache_dirty },
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{ lru|dirty, lru, "clean LRU", me_pagecache_clean },
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{ lru|dirty, lru|dirty, MSG_DIRTY_LRU, me_pagecache_dirty },
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{ lru|dirty, lru, MSG_CLEAN_LRU, me_pagecache_clean },
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/*
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* Catchall entry: must be at end.
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*/
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{ 0, 0, "unknown page state", me_unknown },
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{ 0, 0, MSG_UNKNOWN, me_unknown },
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};
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#undef dirty
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@ -835,10 +881,10 @@ static struct page_state {
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* "Dirty/Clean" indication is not 100% accurate due to the possibility of
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* setting PG_dirty outside page lock. See also comment above set_page_dirty().
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*/
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static void action_result(unsigned long pfn, char *msg, int result)
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static void action_result(unsigned long pfn, enum action_page_type type, int result)
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{
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pr_err("MCE %#lx: %s page recovery: %s\n",
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pfn, msg, action_name[result]);
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pr_err("MCE %#lx: recovery action for %s: %s\n",
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pfn, action_page_types[type], action_name[result]);
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}
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static int page_action(struct page_state *ps, struct page *p,
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@ -854,11 +900,11 @@ static int page_action(struct page_state *ps, struct page *p,
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count--;
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if (count != 0) {
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printk(KERN_ERR
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"MCE %#lx: %s page still referenced by %d users\n",
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pfn, ps->msg, count);
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"MCE %#lx: %s still referenced by %d users\n",
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pfn, action_page_types[ps->type], count);
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result = FAILED;
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}
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action_result(pfn, ps->msg, result);
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action_result(pfn, ps->type, result);
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/* Could do more checks here if page looks ok */
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/*
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@ -1106,7 +1152,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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if (!(flags & MF_COUNT_INCREASED) &&
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!get_page_unless_zero(hpage)) {
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if (is_free_buddy_page(p)) {
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action_result(pfn, "free buddy", DELAYED);
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action_result(pfn, MSG_BUDDY, DELAYED);
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return 0;
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} else if (PageHuge(hpage)) {
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/*
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@ -1123,12 +1169,12 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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}
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set_page_hwpoison_huge_page(hpage);
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res = dequeue_hwpoisoned_huge_page(hpage);
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action_result(pfn, "free huge",
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action_result(pfn, MSG_FREE_HUGE,
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res ? IGNORED : DELAYED);
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unlock_page(hpage);
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return res;
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} else {
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action_result(pfn, "high order kernel", IGNORED);
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action_result(pfn, MSG_KERNEL_HIGH_ORDER, IGNORED);
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return -EBUSY;
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}
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}
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@ -1150,9 +1196,10 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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*/
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if (is_free_buddy_page(p)) {
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if (flags & MF_COUNT_INCREASED)
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action_result(pfn, "free buddy", DELAYED);
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action_result(pfn, MSG_BUDDY, DELAYED);
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else
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action_result(pfn, "free buddy, 2nd try", DELAYED);
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action_result(pfn, MSG_BUDDY_2ND,
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DELAYED);
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return 0;
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}
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}
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@ -1165,7 +1212,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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* If this happens just bail out.
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*/
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if (compound_head(p) != hpage) {
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action_result(pfn, "different compound page after locking", IGNORED);
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action_result(pfn, MSG_DIFFERENT_COMPOUND, IGNORED);
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res = -EBUSY;
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goto out;
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}
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@ -1205,8 +1252,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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* on the head page to show that the hugepage is hwpoisoned
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*/
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if (PageHuge(p) && PageTail(p) && TestSetPageHWPoison(hpage)) {
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action_result(pfn, "hugepage already hardware poisoned",
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IGNORED);
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action_result(pfn, MSG_POISONED_HUGE, IGNORED);
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unlock_page(hpage);
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put_page(hpage);
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return 0;
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@ -1235,7 +1281,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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*/
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if (hwpoison_user_mappings(p, pfn, trapno, flags, &hpage)
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!= SWAP_SUCCESS) {
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action_result(pfn, "unmapping failed", IGNORED);
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action_result(pfn, MSG_UNMAP_FAILED, IGNORED);
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res = -EBUSY;
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goto out;
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}
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@ -1244,7 +1290,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
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* Torn down by someone else?
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*/
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if (PageLRU(p) && !PageSwapCache(p) && p->mapping == NULL) {
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action_result(pfn, "already truncated LRU", IGNORED);
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action_result(pfn, MSG_TRUNCATED_LRU, IGNORED);
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res = -EBUSY;
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goto out;
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}
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