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HWPOISON, hugetlb: support hwpoison injection for hugepage
This patch enables hwpoison injection through debug/hwpoison interfaces, with which we can test memory error handling for free or reserved hugepages (which cannot be tested by madvise() injector). [AK: Export PageHuge too for the injection module] Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Acked-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
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parent
fd6a03edd2
commit
43131e141a
2 changed files with 11 additions and 6 deletions
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@ -615,6 +615,8 @@ int PageHuge(struct page *page)
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return dtor == free_huge_page;
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}
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EXPORT_SYMBOL_GPL(PageHuge);
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static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
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{
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struct page *page;
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@ -5,6 +5,7 @@
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/pagemap.h>
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#include <linux/hugetlb.h>
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#include "internal.h"
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static struct dentry *hwpoison_dir;
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@ -13,6 +14,7 @@ static int hwpoison_inject(void *data, u64 val)
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{
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unsigned long pfn = val;
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struct page *p;
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struct page *hpage;
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int err;
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if (!capable(CAP_SYS_ADMIN))
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@ -24,18 +26,19 @@ static int hwpoison_inject(void *data, u64 val)
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return -ENXIO;
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p = pfn_to_page(pfn);
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hpage = compound_head(p);
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/*
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* This implies unable to support free buddy pages.
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*/
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if (!get_page_unless_zero(p))
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if (!get_page_unless_zero(hpage))
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return 0;
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if (!PageLRU(p))
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if (!PageLRU(p) && !PageHuge(p))
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shake_page(p, 0);
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/*
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* This implies unable to support non-LRU pages.
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*/
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if (!PageLRU(p))
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if (!PageLRU(p) && !PageHuge(p))
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return 0;
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/*
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@ -44,9 +47,9 @@ static int hwpoison_inject(void *data, u64 val)
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* We temporarily take page lock for try_get_mem_cgroup_from_page().
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* __memory_failure() will redo the check reliably inside page lock.
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*/
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lock_page(p);
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err = hwpoison_filter(p);
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unlock_page(p);
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lock_page(hpage);
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err = hwpoison_filter(hpage);
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unlock_page(hpage);
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if (err)
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return 0;
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