From: Dave Hansen <dave@sr71.net>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, dave.jiang@intel.com,
akpm@linux-foundation.org, dhillf@gmail.com,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Mel Gorman <mgorman@suse.de>, Dave Hansen <dave@sr71.net>
Subject: [v3][PATCH 1/2] mm: hugetlbfs: Add VM_BUG_ON()s to catch non-hugetlbfs pages
Date: Fri, 15 Nov 2013 14:55:52 -0800 [thread overview]
Message-ID: <20131115225552.6DCE2E1B@viggo.jf.intel.com> (raw)
In-Reply-To: <20131115225550.737E5C33@viggo.jf.intel.com>
From: Dave Hansen <dave.hansen@linux.intel.com>
Changes from v2:
* Removed the VM_BUG_ON() from copy_huge_page() since the
next patch makes it able to handle non-hugetlbfs pages
--
Dave Jiang reported that he was seeing oopses when running
NUMA systems and default_hugepagesz=1G. I traced the issue down
to migrate_page_copy() trying to use the same code for hugetlb
pages and transparent hugepages. It should not have been trying
to pass thp pages in there.
So, add a VM_BUG_ON()s for the next hapless developer that
tries to use page_hstate() on a non-hugetlbfs page.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Mel Gorman <mgorman@suse.de>
---
linux.git-davehans/include/linux/hugetlb.h | 1 +
1 file changed, 1 insertion(+)
diff -puN include/linux/hugetlb.h~bug-not-hugetlbfs-in-copy_huge_page include/linux/hugetlb.h
--- linux.git/include/linux/hugetlb.h~bug-not-hugetlbfs-in-copy_huge_page 2013-11-15 14:44:41.550357120 -0800
+++ linux.git-davehans/include/linux/hugetlb.h 2013-11-15 14:44:41.553357255 -0800
@@ -355,6 +355,7 @@ static inline pte_t arch_make_huge_pte(p
static inline struct hstate *page_hstate(struct page *page)
{
+ VM_BUG_ON(!PageHuge(page));
return size_to_hstate(PAGE_SIZE << compound_order(page));
}
_
--
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next prev parent reply other threads:[~2013-11-15 22:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-15 22:55 [v3][PATCH 0/2] v3: fix hugetlb vs. anon-thp copy page Dave Hansen
2013-11-15 22:55 ` Dave Hansen [this message]
2013-11-15 22:55 ` [v3][PATCH 2/2] mm: thp: give transparent hugepage code a separate copy_page Dave Hansen
2013-11-18 10:32 ` Mel Gorman
2013-11-18 18:51 ` [v3][PATCH 2/2] mm: thp: give transparent hugepage code aseparate copy_page Naoya Horiguchi
2013-11-18 18:54 ` [PATCH] mm: call cond_resched() per MAX_ORDER_NR_PAGES pages copy Naoya Horiguchi
2013-11-18 19:02 ` Dave Hansen
2013-11-18 20:20 ` Naoya Horiguchi
2013-11-18 20:48 ` Dave Hansen
2013-11-18 21:56 ` Naoya Horiguchi
2013-11-18 22:29 ` Dave Hansen
2013-11-19 0:34 ` Naoya Horiguchi
2013-11-18 19:23 ` [v3][PATCH 0/2] v3: fix hugetlb vs. anon-thp copy page Jiang, Dave
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