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

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Message-ID: <aA-rtji7ujQgckbM@x1.local>
Date: Mon, 28 Apr 2025 12:24:22 -0400
From: Peter Xu <peterx@...hat.com>
To: David Hildenbrand <david@...hat.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>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>
Subject: Re: [PATCH v1 05/11] mm: convert VM_PFNMAP tracking to
 pfnmap_track() + pfnmap_untrack()

On Mon, Apr 28, 2025 at 06:16:21PM +0200, David Hildenbrand wrote:
> > Probably due to what config you have.  E.g., when I'm looking mine it's
> > much bigger and already consuming 256B, but it's because I enabled more
> > things (userfaultfd, lockdep, etc.).
> 
> Note that I enabled everything that you would expect on a production system
> (incld. userfaultfd, mempolicy, per-vma locks), so I didn't enable lockep.

I still doubt whether you at least enabled userfaultfd, e.g., your previous
paste has:

  struct vm_userfaultfd_ctx  vm_userfaultfd_ctx;   /*   176     0 */

Not something that matters.. but just in case you didn't use the expected
config file you wanted to use..

-- 
Peter Xu