linux-kernel - [PATCH 0/2] mm/mempolicy: Cleanup and optimization for weighted interleave

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Message-ID: <20250626200936.3974420-1-joshua.hahnjy@gmail.com>
Date: Thu, 26 Jun 2025 13:09:32 -0700
From: Joshua Hahn <joshua.hahnjy@...il.com>
To: Gregory Price <gourry@...rry.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Alistair Popple <apopple@...dia.com>,
	Byungchul Park <byungchul@...com>,
	David Hildenbrand <david@...hat.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Rakie Kim <rakie.kim@...com>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Zi Yan <ziy@...dia.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	kernel-team@...a.com
Subject: [PATCH 0/2] mm/mempolicy: Cleanup and optimization for weighted interleave

Two small patches for weighted interleave bulk allocaton.

The first patch simplifies the delta calculation needed for the allocations,
removing an if-else and performing unconditional additions instead.

The second patch makes a minor improvement to the weighted interleave bulk
allocation function by skipping a call to __alloc_pages_bulk.

Running a quick benchmark by compiling the kernel shows a small increase
in performance. These experiments were run on a machine with 2 nodes, each
with 125GB memory and 40 CPUs.

time numactl -w 0,1 make -j$(nproc)

+----------+---------+------------+---------+
| Time (s) |  6.16   | With patch | % Delta |
+----------+---------+------------+---------+
| Real     |  88.374 |    88.3356 | -0.2019 |
| User     |  3631.7 |   3636.263 |  0.0631 |
| Sys      | 366.029 |    363.792 | -0.7534 |
+----------+---------+------------+---------+

Signed-off-by: Joshua Hahn <joshua.hahnjy@...il.com>

Joshua Hahn (2):
  mm/mempolicy: Simplify weighted interleave bulk alloc calculations
  mm/mempolicy: Skip extra call to __alloc_pages_bulk in weighted
    interleave

 mm/mempolicy.c | 52 ++++++++++++++++++++++++--------------------------
 1 file changed, 25 insertions(+), 27 deletions(-)


base-commit: bf8761eda0930400291552bd314c9d59b720e899
-- 
2.47.1