* [merged mm-hotfixes-stable] mm-increase-folio-batch-size.patch removed from -mm tree
@ 2024-03-26 18:08 Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2024-03-26 18:08 UTC (permalink / raw
To: mm-commits, yujie.liu, oliver.sang, willy, akpm
The quilt patch titled
Subject: mm: increase folio batch size
has been removed from the -mm tree. Its filename was
mm-increase-folio-batch-size.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: increase folio batch size
Date: Fri, 15 Mar 2024 14:08:21 +0000
On a 104 thread, 2 socket Skylake system, Intel report a 4.7% performance
reduction with will-it-scale page_fault2. This was due to reducing the
size of the batch from 32 to 15. Increasing the folio batch size from 15
to 31 gives a performance increase of 12.5% relative to the original, or
17.2% relative to the reduced performance commit.
The penalty of this commit is an additional 128 bytes of stack usage. Six
folio_batches are also allocated from percpu memory in cpu_fbatches so
that will be an additional 768 bytes of percpu memory (per CPU). Tim Chen
originally submitted a patch like this in 2020:
https://lore.kernel.org/linux-mm/d1cc9f12a8ad6c2a52cb600d93b06b064f2bbc57.1593205965.git.tim.c.chen@linux.intel.com/
Link: https://lkml.kernel.org/r/20240315140823.2478146-1-willy@infradead.org
Fixes: 99fbb6bfc16f ("mm: make folios_put() the basis of release_pages()")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Yujie Liu <yujie.liu@intel.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202403151058.7048f6a8-oliver.sang@intel.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/pagevec.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/linux/pagevec.h~mm-increase-folio-batch-size
+++ a/include/linux/pagevec.h
@@ -11,8 +11,8 @@
#include <linux/types.h>
-/* 15 pointers + header align the folio_batch structure to a power of two */
-#define PAGEVEC_SIZE 15
+/* 31 pointers + header align the folio_batch structure to a power of two */
+#define PAGEVEC_SIZE 31
struct folio;
_
Patches currently in -mm which might be from willy@infradead.org are
mm-always-initialise-folio-_deferred_list.patch
mm-create-folio_flag_false-and-folio_type_ops-macros.patch
mm-remove-folio_prep_large_rmappable.patch
mm-support-page_mapcount-on-page_has_type-pages.patch
mm-turn-folio_test_hugetlb-into-a-pagetype.patch
mm-turn-folio_test_hugetlb-into-a-pagetype-fix.patch
mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
mm-free-up-pg_slab.patch
mm-free-up-pg_slab-fix.patch
mm-improve-dumping-of-mapcount-and-page_type.patch
hugetlb-remove-mention-of-destructors.patch
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2024-03-26 18:08 [merged mm-hotfixes-stable] mm-increase-folio-batch-size.patch removed from -mm tree Andrew Morton
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