|
|
@@ -266,7 +266,7 @@ for each mapping.
|
|
|
|
|
|
The number of file transparent huge pages mapped to userspace is available
|
|
|
by reading ShmemPmdMapped and ShmemHugePages fields in /proc/meminfo.
|
|
|
-To identify what applications are mapping file transparent huge pages, it
|
|
|
+To identify what applications are mapping file transparent huge pages, it
|
|
|
is necessary to read /proc/PID/smaps and count the FileHugeMapped fields
|
|
|
for each mapping.
|
|
|
|
|
|
@@ -292,7 +292,7 @@ thp_collapse_alloc_failed is incremented if khugepaged found a range
|
|
|
the allocation.
|
|
|
|
|
|
thp_file_alloc is incremented every time a file huge page is successfully
|
|
|
-i allocated.
|
|
|
+ allocated.
|
|
|
|
|
|
thp_file_mapped is incremented every time a file huge page is mapped into
|
|
|
user address space.
|
|
|
@@ -501,7 +501,7 @@ scanner can get reference to a page is get_page_unless_zero().
|
|
|
|
|
|
All tail pages have zero ->_refcount until atomic_add(). This prevents the
|
|
|
scanner from getting a reference to the tail page up to that point. After the
|
|
|
-atomic_add() we don't care about the ->_refcount value. We already known how
|
|
|
+atomic_add() we don't care about the ->_refcount value. We already known how
|
|
|
many references should be uncharged from the head page.
|
|
|
|
|
|
For head page get_page_unless_zero() will succeed and we don't mind. It's
|
|
|
@@ -519,8 +519,8 @@ comes. Splitting will free up unused subpages.
|
|
|
|
|
|
Splitting the page right away is not an option due to locking context in
|
|
|
the place where we can detect partial unmap. It's also might be
|
|
|
-counterproductive since in many cases partial unmap unmap happens during
|
|
|
-exit(2) if an THP crosses VMA boundary.
|
|
|
+counterproductive since in many cases partial unmap happens during exit(2) if
|
|
|
+a THP crosses a VMA boundary.
|
|
|
|
|
|
Function deferred_split_huge_page() is used to queue page for splitting.
|
|
|
The splitting itself will happen when we get memory pressure via shrinker
|
SeongJae Park