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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2013-11-13 03:07:26 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 07:09:04 +0400
commit03b61ff3c324e094944b663cc611a8bab252539c (patch)
tree74f8835b4e120adcd60a28c53560cb59589185e7 /mm/memory-failure.c
parent01b0f19707c51ef247404e6af1d4a97a11ba34f7 (diff)
downloadlinux-03b61ff3c324e094944b663cc611a8bab252539c.tar.xz
mm/memory-failure.c: move set_migratetype_isolate() outside get_any_page()
Chen Gong pointed out that set/unset_migratetype_isolate() was done in different functions in mm/memory-failure.c, which makes the code less readable/maintainable. So this patch does it in soft_offline_page(). With this patch, we get to hold lock_memory_hotplug() longer but it's not a problem because races between memory hotplug and soft offline are very rare. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Chen, Gong <gong.chen@linux.intel.com> Acked-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c36
1 files changed, 17 insertions, 19 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index bf3351b5115e..f9d78ec7831f 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1423,19 +1423,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
return 1;
/*
- * The lock_memory_hotplug prevents a race with memory hotplug.
- * This is a big hammer, a better would be nicer.
- */
- lock_memory_hotplug();
-
- /*
- * Isolate the page, so that it doesn't get reallocated if it
- * was free. This flag should be kept set until the source page
- * is freed and PG_hwpoison on it is set.
- */
- if (get_pageblock_migratetype(p) != MIGRATE_ISOLATE)
- set_migratetype_isolate(p, true);
- /*
* When the target page is a free hugepage, just remove it
* from free hugepage list.
*/
@@ -1455,7 +1442,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
/* Not a free page */
ret = 1;
}
- unlock_memory_hotplug();
return ret;
}
@@ -1654,15 +1640,28 @@ int soft_offline_page(struct page *page, int flags)
}
}
+ /*
+ * The lock_memory_hotplug prevents a race with memory hotplug.
+ * This is a big hammer, a better would be nicer.
+ */
+ lock_memory_hotplug();
+
+ /*
+ * Isolate the page, so that it doesn't get reallocated if it
+ * was free. This flag should be kept set until the source page
+ * is freed and PG_hwpoison on it is set.
+ */
+ if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
+ set_migratetype_isolate(page, true);
+
ret = get_any_page(page, pfn, flags);
- if (ret < 0)
- goto unset;
- if (ret) { /* for in-use pages */
+ unlock_memory_hotplug();
+ if (ret > 0) { /* for in-use pages */
if (PageHuge(page))
ret = soft_offline_huge_page(page, flags);
else
ret = __soft_offline_page(page, flags);
- } else { /* for free pages */
+ } else if (ret == 0) { /* for free pages */
if (PageHuge(page)) {
set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage);
@@ -1673,7 +1672,6 @@ int soft_offline_page(struct page *page, int flags)
atomic_long_inc(&num_poisoned_pages);
}
}
-unset:
unset_migratetype_isolate(page, MIGRATE_MOVABLE);
return ret;
}