The patch titled
Subject: mm: fix SHUFFLE_PAGE_ALLOCATOR help texts
has been added to the -mm tree. Its filename is
mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix-2.patch
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------------------------------------------------------
From: Qian Cai <cai@xxxxxx>
Subject: mm: fix SHUFFLE_PAGE_ALLOCATOR help texts
The help texts for SHUFFLE_PAGE_ALLOCATOR makes a wrong assumption that a
page size is 4KB everywhere.
Link: http://lkml.kernel.org/r/20190425201300.75650-1-cai@xxxxxx
Signed-off-by: Qian Cai <cai@xxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/Kconfig | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/init/Kconfig~mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix-2
+++ a/init/Kconfig
@@ -1764,8 +1764,9 @@ config SHUFFLE_PAGE_ALLOCATOR
the presence of a memory-side-cache. There are also incidental
security benefits as it reduces the predictability of page
allocations to compliment SLAB_FREELIST_RANDOM, but the
- default granularity of shuffling on 4MB (MAX_ORDER) pages is
- selected based on cache utilization benefits.
+ default granularity of shuffling on the "MAX_ORDER - 1" i.e,
+ 10th order of pages is selected based on cache utilization
+ benefits on x86.
While the randomization improves cache utilization it may
negatively impact workloads on platforms without a cache. For
_
Patches currently in -mm which might be from cai@xxxxxx are
slab-fix-an-infinite-loop-in-leaks_show.patch
mm-compaction-fix-an-undefined-behaviour.patch
initramfs-cleanup-populate_rootfs-fix.patch
mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization-fix-2.patch
