linux-kernel - Re: [PATCH v3 06/16] mm/mmap: Change munmap to use vma_munmap_struct() for accounting and surrounding vmas

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Message-ID: <CAJuCfpHo2DY4XeR74tSpjcAN+qBfSDzCyi0mPqO-49dZts1uXg@mail.gmail.com>
Date: Wed, 10 Jul 2024 10:29:04 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Suren Baghdasaryan <surenb@...gle.com>, Vlastimil Babka <vbabka@...e.cz>, Lorenzo Stoakes <lstoakes@...il.com>, 
	Matthew Wilcox <willy@...radead.org>, sidhartha.kumar@...cle.com, 
	"Paul E . McKenney" <paulmck@...nel.org>, Bert Karwatzki <spasswolf@....de>, Jiri Olsa <olsajiri@...il.com>, 
	linux-kernel@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v3 06/16] mm/mmap: Change munmap to use
 vma_munmap_struct() for accounting and surrounding vmas

On Wed, Jul 10, 2024 at 9:07 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> On Fri, Jul 5, 2024 at 12:59 PM Liam R. Howlett <Liam.Howlett@...cle.com> wrote:
> >
> > * Lorenzo Stoakes <lorenzo.stoakes@...cle.com> [240705 15:27]:
> > > On Thu, Jul 04, 2024 at 02:27:08PM GMT, Liam R. Howlett wrote:
> > > > Clean up the code by changing the munmap operation to use a structure
> > > > for the accounting and munmap variables.
> > > >
> > > > Since remove_mt() is only called in one location and the contents will
> > > > be reduce to almost nothing.  The remains of the function can be added

nit: s/reduce/reduced

> > > > to vms_complete_munmap_vmas().
> > > >
> > > > Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> > > > ---
> > > >  mm/internal.h |  6 ++++
> > > >  mm/mmap.c     | 81 ++++++++++++++++++++++++++-------------------------
> > > >  2 files changed, 47 insertions(+), 40 deletions(-)
> > > >
> > > > diff --git a/mm/internal.h b/mm/internal.h
> > > > index f1e6dea2efcf..8cbbbe7d40f3 100644
> > > > --- a/mm/internal.h
> > > > +++ b/mm/internal.h
> > > > @@ -1488,12 +1488,18 @@ struct vma_munmap_struct {
> > > >     struct vma_iterator *vmi;
> > > >     struct mm_struct *mm;
> > > >     struct vm_area_struct *vma;     /* The first vma to munmap */
> > > > +   struct vm_area_struct *next;    /* vma after the munmap area */
> > > > +   struct vm_area_struct *prev;    /* vma before the munmap area */
> > >
> > > I mean this is about as pedantic as it gets, and, admittedly an annoying
> > > comment to make, but the ordering... can't we at least put prev before
> > > next? ;)
> >
> > I can do that, no problem.
> > ...
> >
> > >
> > > This is a big improvement overall, very fiddly code.
> > >
> > > Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
>
> Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>
>
> >
> > Thanks!