The patch titled
Subject: mm: soft-offline: clean up soft_offline_page()
has been added to the -mm tree. Its filename is
mm-soft-offline-clean-up-soft_offline_page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-soft-offline-clean-up-soft_offline_page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-soft-offline-clean-up-soft_offline_page.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: mm: soft-offline: clean up soft_offline_page()
soft_offline_page() has some deeply indented code, that's the sign of
demand for cleanup. So let's do this. No functionality change.
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 78 +++++++++++++++++++++++++-----------------
1 file changed, 47 insertions(+), 31 deletions(-)
diff -puN mm/memory-failure.c~mm-soft-offline-clean-up-soft_offline_page mm/memory-failure.c
--- a/mm/memory-failure.c~mm-soft-offline-clean-up-soft_offline_page
+++ a/mm/memory-failure.c
@@ -1684,6 +1684,49 @@ static int __soft_offline_page(struct pa
return ret;
}
+static int soft_offline_in_use_page(struct page *page, int flags)
+{
+ int ret;
+ struct page *hpage = compound_head(page);
+
+ if (!PageHuge(page) && PageTransHuge(hpage)) {
+ lock_page(hpage);
+ ret = split_huge_page(hpage);
+ unlock_page(hpage);
+ if (unlikely(ret || PageTransCompound(page) ||
+ !PageAnon(page))) {
+ pr_info("soft offline: %#lx: failed to split THP\n",
+ page_to_pfn(page));
+ if (flags & MF_COUNT_INCREASED)
+ put_hwpoison_page(hpage);
+ return -EBUSY;
+ }
+ get_hwpoison_page(page);
+ put_hwpoison_page(hpage);
+ }
+
+ if (PageHuge(page))
+ ret = soft_offline_huge_page(page, flags);
+ else
+ ret = __soft_offline_page(page, flags);
+
+ return ret;
+}
+
+static void soft_offline_free_page(struct page *page)
+{
+ if (PageHuge(page)) {
+ struct page *hpage = compound_head(page);
+
+ set_page_hwpoison_huge_page(hpage);
+ if (!dequeue_hwpoisoned_huge_page(hpage))
+ num_poisoned_pages_add(1 << compound_order(hpage));
+ } else {
+ if (!TestSetPageHWPoison(page))
+ num_poisoned_pages_inc();
+ }
+}
+
/**
* soft_offline_page - Soft offline a page.
* @page: page to offline
@@ -1710,7 +1753,6 @@ int soft_offline_page(struct page *page,
{
int ret;
unsigned long pfn = page_to_pfn(page);
- struct page *hpage = compound_head(page);
if (PageHWPoison(page)) {
pr_info("soft offline: %#lx page already poisoned\n", pfn);
@@ -1723,36 +1765,10 @@ int soft_offline_page(struct page *page,
ret = get_any_page(page, pfn, flags);
put_online_mems();
- if (ret > 0) { /* for in-use pages */
- if (!PageHuge(page) && PageTransHuge(hpage)) {
- lock_page(hpage);
- ret = split_huge_page(hpage);
- unlock_page(hpage);
- if (unlikely(ret || PageTransCompound(page) ||
- !PageAnon(page))) {
- pr_info("soft offline: %#lx: failed to split THP\n",
- pfn);
- if (flags & MF_COUNT_INCREASED)
- put_hwpoison_page(hpage);
- return -EBUSY;
- }
- get_hwpoison_page(page);
- put_hwpoison_page(hpage);
- }
+ if (ret > 0)
+ ret = soft_offline_in_use_page(page, flags);
+ else if (ret == 0)
+ soft_offline_free_page(page);
- if (PageHuge(page))
- ret = soft_offline_huge_page(page, flags);
- else
- ret = __soft_offline_page(page, flags);
- } else if (ret == 0) { /* for free pages */
- if (PageHuge(page)) {
- set_page_hwpoison_huge_page(hpage);
- if (!dequeue_hwpoisoned_huge_page(hpage))
- num_poisoned_pages_add(1 << compound_order(hpage));
- } else {
- if (!TestSetPageHWPoison(page))
- num_poisoned_pages_inc();
- }
- }
return ret;
}
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-zonelist-enumerate-zonelists-array-index-fix-fix.patch
mm-zonelist-enumerate-zonelists-array-index-fix-fix-fix.patch
mm-page_isolation-use-micro-to-judge-the-alignment.patch
rmap-add-argument-to-charge-compound-page-fix.patch
mm-soft-offline-check-return-value-in-second-__get_any_page-call.patch
mm-hwpoison-adjust-for-new-thp-refcounting.patch
mm-soft-offline-clean-up-soft_offline_page.patch
mm-soft-offline-exit-with-failure-for-non-anonymous-thp.patch
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