The patch titled
Subject: mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix
has been added to the -mm tree. Its filename is
mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix
Documentation/vm/transhuge.txt too
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/transhuge.txt | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN Documentation/vm/transhuge.txt~mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix Documentation/vm/transhuge.txt
--- a/Documentation/vm/transhuge.txt~mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix
+++ a/Documentation/vm/transhuge.txt
@@ -394,9 +394,9 @@ hugepage natively. Once finished you can
Refcounting on THP is mostly consistent with refcounting on other compound
pages:
- - get_page()/put_page() and GUP operate in head page's ->_count.
+ - get_page()/put_page() and GUP operate in head page's ->_refcount.
- - ->_count in tail pages is always zero: get_page_unless_zero() never
+ - ->_refcount in tail pages is always zero: get_page_unless_zero() never
succeed on tail pages.
- map/unmap of the pages with PTE entry increment/decrement ->_mapcount
@@ -426,15 +426,15 @@ requests to split pinned huge page: it e
sum of mapcount of all sub-pages plus one (split_huge_page caller must
have reference for head page).
-split_huge_page uses migration entries to stabilize page->_count and
+split_huge_page uses migration entries to stabilize page->_refcount and
page->_mapcount.
We safe against physical memory scanners too: the only legitimate way
scanner can get reference to a page is get_page_unless_zero().
-All tail pages has zero ->_count until atomic_add(). It prevent scanner
+All tail pages has zero ->_refcount until atomic_add(). It prevent scanner
from geting reference to tail page up to the point. After the atomic_add()
-we don't care about ->_count value. We already known how many references
+we don't care about ->_refcount value. We already known how many references
with should uncharge from head page.
For head page get_page_unless_zero() will succeed and we don't mind. It's
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
drivers-gpu-drm-i915-intel_spritec-fix-build.patch
drivers-gpu-drm-i915-intel_tvc-fix-build.patch
mm-rename-_count-field-of-the-struct-page-to-_refcount-fix.patch
mm-rename-_count-field-of-the-struct-page-to-_refcount-fix-fix.patch
ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-2.patch
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
mm.patch
include-linux-apply-__malloc-attribute-checkpatch-fixes.patch
include-linux-nodemaskh-create-next_node_in-helper.patch
mm-oom-rework-oom-detection-checkpatch-fixes.patch
mm-use-watermak-checks-for-__gfp_repeat-high-order-allocations-checkpatch-fixes.patch
drivers-net-wireless-intel-iwlwifi-dvm-calibc-fix-min-warning.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
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