From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R. Howlett" <liam@infradead.org>,
Nico Pache <nico.pache@linux.dev>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>,
Lance Yang <lance.yang@linux.dev>,
Usama Arif <usama.arif@linux.dev>,
Kiryl Shutsemau <kas@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Boqun Feng <boqun@kernel.org>, Waiman Long <longman@redhat.com>,
Suren Baghdasaryan <surenb@google.com>,
Vlastimil Babka <vbabka@kernel.org>,
Shakeel Butt <shakeel.butt@linux.dev>,
Yonghong Song <yonghong.song@linux.dev>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Emil Tsalapatis <emil@etsalapatis.com>,
Ihor Solodrai <ihor.solodrai@linux.dev>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [PATCH 2/5] mm/khugepaged: scan mm's more efficiently under mmap_lock contention
Date: Thu, 5 Nov 2026 14:01:56 +0000 [thread overview]
Message-ID: <auyL2gLT3lDVqwMJ@gremlin> (raw)
In-Reply-To: <dfa01a1d-0b95-4cd2-ab8a-390da5ffe2ab@kernel.org>
On Thu, Nov 05, 2026 at 11:23:41AM +0100, David Hildenbrand (Arm) wrote:
> I could have sworn I saw a similar patch from Nico at some point ... maybe it
> was in a private discussion.
Ah, yeah, it seems a fairly obvious thing to do (as often these things
are), was surprised somebody hadn't already tried it.
>
>
> Am I correct or is the short version of this change "Remember the next scan
> address per MM instead of starting from address 0 whenever we continue scanning
> a MM after a skip; and we might skip under mmap lock contention" ?
Yes!
>
> I think a lot of the commit message above can be simplified.
The book author part of me comes through sometimes ;) Will try and cut it
down for the respin.
>
> Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Thanks!
>
> --
> Cheers,
>
> David
--
Cheers, Lorenzo
next prev parent reply other threads:[~2026-11-05 14:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 8:27 [PATCH 0/5] mm/khugepaged: bound mmap_lock hold time when walking an mm's VMAs Lorenzo Stoakes (ARM)
2026-11-03 8:27 ` [PATCH 1/5] Revert "mm/khugepaged: remove definition of struct khugepaged_mm_slot" Lorenzo Stoakes (ARM)
2026-11-04 7:46 ` Lance Yang
2026-11-05 10:17 ` David Hildenbrand (Arm)
2026-11-03 8:27 ` [PATCH 2/5] mm/khugepaged: scan mm's more efficiently under mmap_lock contention Lorenzo Stoakes (ARM)
2026-11-04 8:43 ` Lance Yang
2026-11-05 10:23 ` David Hildenbrand (Arm)
2026-11-05 14:01 ` Lorenzo Stoakes (ARM) [this message]
2026-11-03 8:27 ` [PATCH 3/5] locking/rwsem: add down_read[_killable]_nosteal() Lorenzo Stoakes (ARM)
2026-11-03 11:51 ` Peter Zijlstra
2026-11-03 12:24 ` Lorenzo Stoakes (ARM)
2026-11-05 10:25 ` David Hildenbrand (Arm)
2026-11-05 10:29 ` Lorenzo Stoakes (ARM)
2026-11-03 8:27 ` [PATCH 4/5] mm: add and use mmap_read_lock[_killable]_nosteal() on contention Lorenzo Stoakes (ARM)
2026-11-05 10:16 ` David Hildenbrand (Arm)
2026-11-05 14:02 ` Lorenzo Stoakes (ARM)
2026-11-05 16:23 ` Alexei Starovoitov
2026-11-03 8:27 ` [PATCH 5/5] mm/khugepaged: drop/reacquire mmap read lock if skipped enough VMAs Lorenzo Stoakes (ARM)
2026-11-05 10:28 ` David Hildenbrand (Arm)
2026-11-05 14:46 ` Lorenzo Stoakes (ARM)
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