From: Qian Cai <cai@lca.pw>
To: akpm@linux-foundation.org
Cc: dan.j.williams@intel.com, linux-mm@kvack.org, Qian Cai <cai@lca.pw>
Subject: [PATCH -mmotm] mm: fix SHUFFLE_PAGE_ALLOCATOR help texts
Date: Thu, 25 Apr 2019 16:13:00 -0400 [thread overview]
Message-ID: <20190425201300.75650-1-cai@lca.pw> (raw)
The help texts for SHUFFLE_PAGE_ALLOCATOR makes a wrong assumption that
a page size is 4KB everywhere.
Signed-off-by: Qian Cai <cai@lca.pw>
---
Fix mm-shuffle-initial-free-memory-to-improve-memory-side-cache-utilization.patch.
init/Kconfig | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index b050890f69dc..d96a910369c7 100644
--- a/init/Kconfig
+++ b/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
--
2.20.1 (Apple Git-117)
next reply other threads:[~2019-04-25 20:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-25 20:13 Qian Cai [this message]
2019-04-25 20:36 ` [PATCH -mmotm] mm: fix SHUFFLE_PAGE_ALLOCATOR help texts Dan Williams
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