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>, <muchun.song@linux.dev>,
<rppt@kernel.org>, <tglx@kernel.org>,
<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 v9 0/8] mm: optimize zone-device memmap initialization
Date: Mon, 3 Aug 2026 14:40:14 -0700 [thread overview]
Message-ID: <20260803144014.e2d4ebb83e9471b695f6290d@linux-foundation.org> (raw)
In-Reply-To: <20260803070929.86075-1-lizhe.67@bytedance.com>
On Mon, 3 Aug 2026 15:09:21 +0800 "Li Zhe" <lizhe.67@bytedance.com> wrote:
> Test procedure:
> Rebind the nd_pmem and dax_pmem drivers 30 times and collect the memmap
> initialization time from the pr_debug() output of
> memmap_init_zone_device().
>
> Base(v7.2-rc1):
> Average of nd_pmem rebinds: 244.28 ms
> Average of dax_pmem rebinds: 273.31 ms
>
> With this series applied:
> Average of nd_pmem rebinds: 96.79 ms
> Average of dax_pmem rebinds: 119.04 ms
>
> This reduces the average memmap initialization time measured during
> rebind by about 60.4% for nd_pmem and 56.4% for dax_pmem.
Well that's nice.
Review is partial and it's late in the cycle so I'd prefer to schedule
this for the next -rc cycle.
AI review might have found a couple of things, please check?
https://sashiko.dev/#/patchset/20260803070929.86075-1-lizhe.67@bytedance.com
next prev parent reply other threads:[~2026-08-03 21:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-03 7:09 [PATCH v9 0/8] mm: optimize zone-device memmap initialization Li Zhe
2026-08-03 7:09 ` [PATCH v9 1/8] mm: fix stale ZONE_DEVICE refcount comment Li Zhe
2026-08-03 7:09 ` [PATCH v9 2/8] mm: factor zone-device page init helpers out of __init_zone_device_page Li Zhe
2026-08-03 7:09 ` [PATCH v9 3/8] mm: add a set_page_section_from_pfn() helper Li Zhe
2026-08-03 7:09 ` [PATCH v9 4/8] mm: add a template-based fast path for zone-device page init Li Zhe
2026-08-03 8:39 ` Muchun Song
2026-08-05 9:50 ` Li Zhe
2026-08-03 7:09 ` [PATCH v9 5/8] mm: extend the template fast path to zone-device compound tails Li Zhe
2026-08-03 7:09 ` [PATCH v9 6/8] string: introduce memcpy_nontemporal() Li Zhe
2026-08-03 7:09 ` [PATCH v9 7/8] mm: use memcpy_nontemporal() in zone-device template copies Li Zhe
2026-08-03 7:09 ` [PATCH v9 8/8] x86/string: extend memcpy_flushcache() fixed-size fastpaths Li Zhe
2026-08-04 20:35 ` Borislav Petkov
2026-08-05 11:04 ` Li Zhe
2026-08-03 21:40 ` Andrew Morton [this message]
2026-08-05 9:49 ` [PATCH v9 0/8] mm: optimize zone-device memmap initialization Li Zhe
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