The patch titled
Subject: mm,hwpoison: disable pcplists before grabbing a refcount
has been added to the -mm tree. Its filename is
mmhwpoison-disable-pcplists-before-grabbing-a-refcount.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mmhwpoison-disable-pcplists-before-grabbing-a-refcount.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mmhwpoison-disable-pcplists-before-grabbing-a-refcount.patch
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------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm,hwpoison: disable pcplists before grabbing a refcount
Currently, we have a sort of retry mechanism to make sure pages in
pcp-lists are spilled to the buddy system, so we can handle those.
We can save us this extra checks with the new disable-pcplist mechanism
that is available with [1].
zone_pcplist_disable makes sure to 1) disable pcplists, so any page that
is freed up from that point onwards will end up in the buddy system and 2)
drain pcplists, so those pages that already in pcplists are spilled to
buddy.
With that, we can make a common entry point for grabbing a refcount from
both soft_offline and memory_failure paths that is guarded by
zone_pcplist_disable/zone_pcplist_enable.
[1] https://patchwork.kernel.org/project/linux-mm/cover/20201111092812.11329-1-vbabka@xxxxxxx/
Link: https://lkml.kernel.org/r/20201119105716.5962-7-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 120 ++++++++++++++++++++----------------------
1 file changed, 58 insertions(+), 62 deletions(-)
--- a/mm/memory-failure.c~mmhwpoison-disable-pcplists-before-grabbing-a-refcount
+++ a/mm/memory-failure.c
@@ -985,26 +985,67 @@ static int __get_hwpoison_page(struct pa
return 0;
}
-static int get_hwpoison_page(struct page *p)
+/*
+ * Safely get reference count of an arbitrary page.
+ *
+ * Returns 0 for a free page, 1 for an in-use page,
+ * -EIO for a page-type we cannot handle and -EBUSY if we raced with an
+ * allocation.
+ * We only incremented refcount in case the page was already in-use and it
+ * is a known type we can handle.
+ */
+static int get_any_page(struct page *p)
{
- int ret;
- bool drained = false;
+ int ret = 0, pass = 0;
-retry:
- ret = __get_hwpoison_page(p);
- if (!ret && !is_free_buddy_page(p) && !page_count(p) && !drained) {
- /*
- * The page might be in a pcplist, so try to drain those
- * and see if we are lucky.
- */
- drain_all_pages(page_zone(p));
- drained = true;
- goto retry;
+try_again:
+ if (!__get_hwpoison_page(p)) {
+ if (page_count(p)) {
+ /* We raced with an allocation, retry. */
+ if (pass++ < 3)
+ goto try_again;
+ ret = -EBUSY;
+ } else if (!PageHuge(p) && !is_free_buddy_page(p)) {
+ /* We raced with put_page, retry. */
+ if (pass++ < 3)
+ goto try_again;
+ ret = -EIO;
+ }
+ } else {
+ if (PageHuge(p) || PageLRU(p) || __PageMovable(p)) {
+ ret = 1;
+ } else {
+ /*
+ * A page we cannot handle. Check whether we can turn
+ * it into something we can handle.
+ */
+ if (pass++ < 3) {
+ put_page(p);
+ shake_page(p, 1);
+ goto try_again;
+ }
+ put_page(p);
+ ret = -EIO;
+ }
}
return ret;
}
+static int get_hwpoison_page(struct page *p, enum mf_flags ctxt)
+{
+ int ret;
+
+ zone_pcp_disable(page_zone(p));
+ if (ctxt == MF_SOFT_OFFLINE)
+ ret = get_any_page(p);
+ else
+ ret = __get_hwpoison_page(p);
+ zone_pcp_enable(page_zone(p));
+
+ return ret;
+}
+
/*
* Do all that is necessary to remove user space mappings. Unmap
* the pages and send SIGBUS to the processes if the data was dirty.
@@ -1185,7 +1226,7 @@ static int memory_failure_hugetlb(unsign
num_poisoned_pages_inc();
- if (!get_hwpoison_page(p)) {
+ if (!get_hwpoison_page(p, 0)) {
/*
* Check "filter hit" and "race with other subpage."
*/
@@ -1387,7 +1428,7 @@ try_again:
* In fact it's dangerous to directly bump up page count from 0,
* that may make page_ref_freeze()/page_ref_unfreeze() mismatch.
*/
- if (!get_hwpoison_page(p)) {
+ if (!get_hwpoison_page(p, 0)) {
if (is_free_buddy_page(p)) {
if (take_page_off_buddy(p)) {
page_ref_inc(p);
@@ -1674,7 +1715,7 @@ int unpoison_memory(unsigned long pfn)
return 0;
}
- if (!get_hwpoison_page(p)) {
+ if (!get_hwpoison_page(p, 0)) {
if (TestClearPageHWPoison(p))
num_poisoned_pages_dec();
unpoison_pr_info("Unpoison: Software-unpoisoned free page %#lx\n",
@@ -1705,51 +1746,6 @@ int unpoison_memory(unsigned long pfn)
}
EXPORT_SYMBOL(unpoison_memory);
-/*
- * Safely get reference count of an arbitrary page.
- * Returns 0 for a free page, 1 for an in-use page, -EIO for a page-type we
- * cannot handle and -EBUSY if we raced with an allocation.
- * We only incremented refcount in case the page was already in-use and it is
- * a known type we can handle.
- */
-static int get_any_page(struct page *p)
-{
- int ret = 0, pass = 0;
-
-try_again:
- if (!get_hwpoison_page(p)) {
- if (page_count(p)) {
- /* We raced with an allocation, retry. */
- if (pass++ < 3)
- goto try_again;
- ret = -EBUSY;
- } else if (!PageHuge(p) && !is_free_buddy_page(p)) {
- /* We raced with put_page, retry. */
- if (pass++ < 3)
- goto try_again;
- ret = -EIO;
- }
- } else {
- if (PageHuge(p) || PageLRU(p) || __PageMovable(p)) {
- ret = 1;
- } else {
- /*
- * A page we cannot handle. Check whether we can turn
- * it into something we can handle.
- */
- if (pass++ < 3) {
- put_page(p);
- shake_page(p, 1);
- goto try_again;
- }
- put_page(p);
- ret = -EIO;
- }
- }
-
- return ret;
-}
-
static bool isolate_page(struct page *page, struct list_head *pagelist)
{
bool isolated = false;
@@ -1920,7 +1916,7 @@ int soft_offline_page(unsigned long pfn)
retry:
get_online_mems();
- ret = get_any_page(page);
+ ret = get_hwpoison_page(page, MF_SOFT_OFFLINE);
put_online_mems();
if (ret > 0) {
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
mmhwpoison-drain-pcplists-before-bailing-out-for-non-buddy-zero-refcount-page.patch
mmhwpoison-take-free-pages-off-the-buddy-freelists.patch
mmhwpoison-take-free-pages-off-the-buddy-freelists-for-hugetlb.patch
mmhwpoison-drop-unneeded-pcplist-draining.patch
mmhwpoison-refactor-get_any_page.patch
mmhwpoison-drop-pfn-parameter.patch
mmhwpoison-disable-pcplists-before-grabbing-a-refcount.patch
mmhwpoison-remove-drain_all_pages-from-shake_page.patch
mmhugetlb-remove-unneded-initialization.patch
