linux-kernel - Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to pfnmap_track() + pfnmap

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Message-ID: <5a2103cb-08c7-4085-ad88-3d373562047e@redhat.com>
Date: Mon, 28 Apr 2025 22:21:35 +0200
From: David Hildenbrand <david@...hat.com>
To: Suren Baghdasaryan <surenb@...gle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
 intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-trace-kernel@...r.kernel.org, Dave Hansen
 <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>, Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Tvrtko Ursulin
 <tursulin@...ulin.net>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Andrew Morton <akpm@...ux-foundation.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
 Pedro Falcato <pfalcato@...e.de>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to pfnmap_track()
 + pfnmap_untrack()

On 28.04.25 22:00, Suren Baghdasaryan wrote:
> On Mon, Apr 28, 2025 at 12:47 PM Lorenzo Stoakes
> <lorenzo.stoakes@...cle.com> wrote:
>>
>> +cc Suren, who has worked HEAVILY on VMA field manipulation and such :)
>>
>> Suren - David is proposing adding a new field. AFAICT this does not add a
>> new cache line so I think we're all good.
>>
>> But FYI!
> 
> Thanks! Yes, there should be some space in the last cacheline after my
> last field reshuffling.

That explains why -- that last time I looked at this -- there was no 
easy space available. Thanks for that!

-- 
Cheers,

David / dhildenb