The patch titled
Subject: mm/hotplug: optimize clear_hwpoisoned_pages()
has been removed from the -mm tree. Its filename was
mm-hotplug-optimize-clear_hwpoisoned_pages.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Balbir Singh <bsingharora@xxxxxxxxx>
Subject: mm/hotplug: optimize clear_hwpoisoned_pages()
In hot remove, we try to clear poisoned pages, but a small optimization to
check if num_poisoned_pages is 0 helps remove the iteration through
nr_pages.
[akpm@xxxxxxxxxxxxxxxxxxxx: tweak comment text]
Link: http://lkml.kernel.org/r/20181102120001.4526-1-bsingharora@xxxxxxxxx
Signed-off-by: Balbir Singh <bsingharora@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/sparse.c~mm-hotplug-optimize-clear_hwpoisoned_pages
+++ a/mm/sparse.c
@@ -740,6 +740,15 @@ static void clear_hwpoisoned_pages(struc
if (!memmap)
return;
+ /*
+ * A further optimization is to have per section refcounted
+ * num_poisoned_pages. But that would need more space per memmap, so
+ * for now just do a quick global check to speed up this routine in the
+ * absence of bad pages.
+ */
+ if (atomic_long_read(&num_poisoned_pages) == 0)
+ return;
+
for (i = 0; i < nr_pages; i++) {
if (PageHWPoison(&memmap[i])) {
atomic_long_sub(1, &num_poisoned_pages);
_
Patches currently in -mm which might be from bsingharora@xxxxxxxxx are
