From: Andrew Morton <akpm@linux-foundation.org>
To: "Li Zhe" <lizhe.67@bytedance.com>
Cc: <apopple@nvidia.com>, <arnd@arndb.de>, <balbirs@nvidia.com>,
<bp@alien8.de>, <dave.hansen@linux.intel.com>, <david@kernel.org>,
<kees@kernel.org>, <mingo@redhat.com>, <rppt@kernel.org>,
<tglx@kernel.org>, <muchun.song@linux.dev>,
<linux-arch@vger.kernel.org>, <linux-hardening@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>,
<x86@kernel.org>
Subject: Re: [PATCH v7 0/9] mm: optimize zone-device memmap initialization
Date: Mon, 20 Jul 2026 15:43:34 -0700 [thread overview]
Message-ID: <20260720154334.b619e7b436d2dc2481b233ea@linux-foundation.org> (raw)
In-Reply-To: <20260720120259.1545-1-lizhe.67@bytedance.com>
On Mon, 20 Jul 2026 20:02:49 +0800 "Li Zhe" <lizhe.67@bytedance.com> wrote:
> memmap_init_zone_device() can take a noticeable amount of time when large
> pmem namespaces are bound or rebound, because it initializes nearly
> identical struct page descriptors one PFN at a time. This series reduces
> that ZONE_DEVICE memmap initialization overhead by reusing prepared
> struct page templates and, on x86, using memcpy_nontemporal() for the
> template copy path.
What Dave said - more details on the real-world userspace benefit would
be helpful, thanks.
AI review might have found some things, one "critical":
https://sashiko.dev/#/patchset/20260720120259.1545-1-lizhe.67@bytedance.com
prev parent reply other threads:[~2026-07-20 22:43 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 12:02 [PATCH v7 0/9] mm: optimize zone-device memmap initialization Li Zhe
2026-07-20 12:02 ` Li Zhe
2026-07-20 12:02 ` [PATCH v7 1/9] mm: fix stale ZONE_DEVICE refcount comment Li Zhe
2026-07-20 12:02 ` [PATCH v7 2/9] mm: factor zone-device page init helpers out of __init_zone_device_page Li Zhe
2026-07-20 12:02 ` [PATCH v7 3/9] mm: add a set_page_section_from_pfn() helper Li Zhe
2026-07-20 12:02 ` [PATCH v7 4/9] mm: add a template-based fast path for zone-device page init Li Zhe
2026-07-20 12:02 ` [PATCH v7 5/9] mm: extend the template fast path to zone-device compound tails Li Zhe
2026-07-20 12:02 ` [PATCH v7 6/9] string: introduce memcpy_nontemporal() Li Zhe
2026-07-20 12:02 ` [PATCH v7 7/9] x86/string: extend memcpy_flushcache() fixed-size fastpaths Li Zhe
2026-07-20 12:02 ` [PATCH v7 8/9] mm: use memcpy_nontemporal() in zone-device template copies Li Zhe
2026-07-20 12:02 ` [PATCH v7 9/9] mm: always use the zone-device template init path Li Zhe
2026-07-20 13:05 ` [PATCH v7 0/9] mm: optimize zone-device memmap initialization Dave Hansen
2026-07-22 4:00 ` Li Zhe
2026-07-20 22:43 ` Andrew Morton [this message]
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