linux-kernel - Re: [PATCH v2 3/7] mm: introduce vma_count

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Message-ID: <64231ee4-c1a5-41a0-b13e-505a46cf671c@lucifer.local>
Date: Thu, 18 Sep 2025 14:26:04 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Kalesh Singh <kaleshsingh@...gle.com>
Cc: akpm@...ux-foundation.org, minchan@...nel.org, david@...hat.com,
        Liam.Howlett@...cle.com, rppt@...nel.org, pfalcato@...e.de,
        kernel-team@...roid.com, android-mm@...gle.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
        Kees Cook <kees@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Valentin Schneider <vschneid@...hat.com>, Jann Horn <jannh@...gle.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 3/7] mm: introduce vma_count_remaining()

On Thu, Sep 18, 2025 at 02:20:03PM +0100, Lorenzo Stoakes wrote:
> On Mon, Sep 15, 2025 at 09:36:34AM -0700, Kalesh Singh wrote:
> >  include/linux/mm.h               |  2 --
> >  mm/internal.h                    |  2 ++
> >  mm/mmap.c                        | 21 ++++++++++++++++++++-
> >  mm/mremap.c                      |  7 ++++---
> >  mm/nommu.c                       |  2 +-
> >  mm/util.c                        |  1 -
> >  mm/vma.c                         | 10 +++++-----
> >  tools/testing/vma/vma_internal.h |  9 +++++++++
>
> Will look into this properly later, but there's a conflict in vma_internal.h
> atm for mm-new FYI.
>
> > diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h
> > index 3639aa8dd2b0..52cd7ddc73f4 100644
> > --- a/tools/testing/vma/vma_internal.h
> > +++ b/tools/testing/vma/vma_internal.h
> > @@ -1517,4 +1517,13 @@ static inline vm_flags_t ksm_vma_flags(const struct mm_struct *, const struct fi
> >  	return vm_flags;
> >  }
> >
> > +/* Helper to get VMA count capacity */
> > +static int vma_count_remaining(const struct mm_struct *mm)
> > +{
> > +	const int map_count = mm->map_count;
> > +	const int max_count = sysctl_max_map_count;
> > +
> > +	return (max_count > map_count) ? (max_count - map_count) : 0;
> > +}
> > +
> >  #endif	/* __MM_VMA_INTERNAL_H */
> > --
> > 2.51.0.384.g4c02a37b29-goog
> >
>
> Probably because stuff got added at the end... :)

Oh mm/internal.h too, seems that's my mmap_prepare series. FYI