From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Kiryl Shutsemau <kirill@shutemov.name>,
Wenchao Hao <haowenchao22@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: Add AnonZero accounting for zero-filled anonymous pages
Date: Mon, 16 Feb 2026 12:45:13 +0100 [thread overview]
Message-ID: <ddb0d3f8-a617-49a2-8fb1-e6293f376030@kernel.org> (raw)
In-Reply-To: <aZMAVF1S1kP5Gny_@thinkstation>
On 2/16/26 12:34, Kiryl Shutsemau wrote:
> On Sat, Feb 14, 2026 at 04:45:14PM +0800, Wenchao Hao wrote:
>> Add kernel command line option "count_zero_page" to track anonymous pages
>> have been allocated and mapped to userspace but zero-filled.
>>
>> This feature is mainly used to debug large folio mechanism, which
>> pre-allocates and map more pages than actually needed, leading to memory
>> waste from unaccessed pages.
>>
>> Export the result in /proc/pid/smaps as "AnonZero" field.
>
> I expect it to slowdown /proc/pid/smaps read substantially. I don't
> think this line in smaps worth it.
>
That's why it's enabled through a command line parameter.
--
Cheers,
David
next prev parent reply other threads:[~2026-02-16 11:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-14 8:45 Wenchao Hao
2026-02-16 11:34 ` Kiryl Shutsemau
2026-02-16 11:45 ` David Hildenbrand (Arm) [this message]
2026-02-16 11:58 ` Kiryl Shutsemau
2026-02-16 12:19 ` David Hildenbrand (Arm)
2026-02-16 15:59 ` Wenchao Hao
2026-02-16 16:42 ` Michal Hocko
2026-02-16 16:56 ` David Hildenbrand (Arm)
2026-02-16 17:10 ` Michal Hocko
2026-02-16 17:17 ` David Hildenbrand (Arm)
2026-02-16 16:54 ` Kiryl Shutsemau
2026-02-16 17:01 ` Matthew Wilcox
2026-02-16 17:10 ` David Hildenbrand (Arm)
2026-02-16 17:18 ` Kiryl Shutsemau
2026-02-16 12:15 ` David Hildenbrand (Arm)
2026-02-16 15:10 ` Wenchao Hao
2026-02-16 15:18 ` David Hildenbrand (Arm)
2026-02-16 14:22 ` Matthew Wilcox
2026-02-16 15:55 ` Wenchao Hao
2026-02-16 17:03 ` Matthew Wilcox
2026-02-17 15:22 ` Wenchao Hao
2026-02-17 20:29 ` David Hildenbrand (Arm)
2026-02-17 21:53 ` Kiryl Shutsemau
2026-02-19 2:11 ` Wenchao Hao
2026-02-18 7:52 ` Michal Hocko
2026-02-19 2:47 ` Wenchao Hao
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