From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Mike Rapoport <rppt@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Kairui Song <kasong@tencent.com>,
Qi Zheng <qi.zheng@linux.dev>,
Shakeel Butt <shakeel.butt@linux.dev>,
Barry Song <baohua@kernel.org>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Baoquan He <baoquan.he@linux.dev>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Brendan Jackman <brendan.jackman@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Oscar Salvador <osalvador@suse.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Danilo Krummrich <dakr@kernel.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Kieran Bingham <kbingham@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-cxl@vger.kernel.org, driver-core@lists.linux.dev,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 06/12] mm/sparse: rename __highest_present_section_nr to __highest_used_section_nr
Date: Mon, 14 Sep 2026 15:57:02 +0200 [thread overview]
Message-ID: <9f28f634-9015-4b62-a197-0414122ddd4c@kernel.org> (raw)
In-Reply-To: <178937914266.4188640.6188797346240816067.b4-review@b4>
On 9/14/26 11:45, Mike Rapoport wrote:
>> /*
>> - * There are a number of times that we loop over NR_MEM_SECTIONS,
>> - * looking for section_present() on each. But, when we have very
>> - * large physical address spaces, NR_MEM_SECTIONS can also be
>> - * very large which makes the loops quite long.
>> - *
>> - * Keeping track of this gives us an easy way to break out of
>> - * those loops early.
>> + * Looping over all memory sections is expensive, especially if NR_MEM_SECTIONS
> ... all possible ... maybe?
Ack, thanks!
--
Cheers,
David
next prev parent reply other threads:[~2026-09-14 13:57 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-09 13:32 [PATCH 00/12] mm/sparse: remove SECTION_MARKED_PRESENT and further cleanups David Hildenbrand (Arm)
2026-09-09 13:32 ` [PATCH 01/12] mm/sparse: move mem_section init to sparse_extreme_init() David Hildenbrand (Arm)
2026-09-09 17:02 ` Oscar Salvador (SUSE)
2026-09-10 12:52 ` Lorenzo Stoakes (ARM)
2026-09-10 13:13 ` David Hildenbrand (Arm)
2026-09-10 13:33 ` Lorenzo Stoakes (ARM)
2026-09-09 13:32 ` [PATCH 02/12] mm/sparse: refactor sparse_sections_init() David Hildenbrand (Arm)
2026-09-09 17:09 ` Oscar Salvador (SUSE)
2026-09-09 17:18 ` David Hildenbrand (Arm)
2026-09-10 13:29 ` Lorenzo Stoakes (ARM)
2026-09-10 14:30 ` David Hildenbrand (Arm)
2026-09-10 14:38 ` Lorenzo Stoakes (ARM)
2026-09-14 9:45 ` Mike Rapoport
2026-09-09 13:32 ` [PATCH 03/12] mm/sparse: move initialization of section metadata to sparse_metadata_init() David Hildenbrand (Arm)
2026-09-09 17:22 ` Oscar Salvador (SUSE)
2026-09-10 13:43 ` Lorenzo Stoakes (ARM)
2026-09-09 13:32 ` [PATCH 04/12] mm/sparse: rename and cleanup sparse_init_nid() David Hildenbrand (Arm)
2026-09-10 7:41 ` Oscar Salvador (SUSE)
2026-09-10 13:46 ` Lorenzo Stoakes (ARM)
2026-09-10 14:29 ` David Hildenbrand (Arm)
2026-09-09 13:32 ` [PATCH 05/12] mm/sparse: cleanup sparse_init_one_section() David Hildenbrand (Arm)
2026-09-10 7:45 ` Oscar Salvador (SUSE)
2026-09-10 13:47 ` Lorenzo Stoakes (ARM)
2026-09-09 13:32 ` [PATCH 06/12] mm/sparse: rename __highest_present_section_nr to __highest_used_section_nr David Hildenbrand (Arm)
2026-09-10 7:56 ` Oscar Salvador (SUSE)
2026-09-10 13:49 ` Lorenzo Stoakes (ARM)
2026-09-14 9:45 ` Mike Rapoport
2026-09-14 13:57 ` David Hildenbrand (Arm) [this message]
2026-09-09 13:33 ` [PATCH 07/12] mm/sparse: remove pfn_in_present_section() David Hildenbrand (Arm)
2026-09-10 7:59 ` Oscar Salvador (SUSE)
2026-09-10 13:50 ` Lorenzo Stoakes (ARM)
2026-09-09 13:33 ` [PATCH 08/12] mm/sparse: move __highest_used_section_nr handling David Hildenbrand (Arm)
2026-09-09 14:44 ` David Hildenbrand (Arm)
2026-09-10 8:33 ` Oscar Salvador (SUSE)
2026-09-10 9:13 ` David Hildenbrand (Arm)
2026-09-10 12:08 ` Oscar Salvador (SUSE)
2026-09-10 13:33 ` David Hildenbrand (Arm)
2026-09-10 14:16 ` Lorenzo Stoakes (ARM)
2026-09-10 14:29 ` David Hildenbrand (Arm)
2026-09-10 14:51 ` Lorenzo Stoakes (ARM)
2026-09-14 9:45 ` Mike Rapoport
2026-09-09 13:33 ` [PATCH 09/12] mm/sparse: remove SECTION_MARKED_PRESENT David Hildenbrand (Arm)
2026-09-10 12:15 ` Oscar Salvador (SUSE)
2026-09-10 14:32 ` Lorenzo Stoakes (ARM)
2026-09-10 15:11 ` David Hildenbrand (Arm)
2026-09-09 13:33 ` [PATCH 10/12] mm/sparse: remove flags parameter from sparse_init_one_section() David Hildenbrand (Arm)
2026-09-10 12:34 ` Oscar Salvador (SUSE)
2026-09-10 14:34 ` Lorenzo Stoakes (ARM)
2026-09-09 13:33 ` [PATCH 11/12] fs/proc/page: clarify comment in get_max_dump_pfn() David Hildenbrand (Arm)
2026-09-10 12:46 ` Oscar Salvador (SUSE)
2026-09-10 14:41 ` Lorenzo Stoakes (ARM)
2026-09-10 15:14 ` David Hildenbrand (Arm)
2026-09-09 13:33 ` [PATCH 12/12] mm/memory_hotplug: drop CONFIG_HAVE_ARCH_PFN_VALID handling from pfn_to_online_page() David Hildenbrand (Arm)
2026-09-10 14:47 ` Lorenzo Stoakes (ARM)
2026-09-10 15:15 ` David Hildenbrand (Arm)
2026-09-14 9:45 ` [PATCH 00/12] mm/sparse: remove SECTION_MARKED_PRESENT and further cleanups Mike Rapoport
2026-09-14 13:58 ` David Hildenbrand (Arm)
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