linux-kernel - Re: [PATCH v3] mm: memory: fix /proc/meminfo reporting for MLOCK

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Date:   Tue, 17 Sep 2019 14:37:58 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Lucian Adrian Grijincu <lucian@...com>
Cc:     linux-mm@...ck.org, Souptick Joarder <jrdr.linux@...il.com>,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...com>, Roman Gushchin <guro@...com>
Subject: Re: [PATCH v3] mm: memory: fix /proc/meminfo reporting for
 MLOCK_ONFAULT

On Mon, Sep 16, 2019 at 06:26:19PM +0300, Kirill A. Shutemov wrote:
> > ---
> >  mm/memory.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/mm/memory.c b/mm/memory.c
> > index e0c232fe81d9..55da24f33bc4 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -3311,6 +3311,8 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
> >  	} else {
> >  		inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
> >  		page_add_file_rmap(page, false);
> > +		if (vma->vm_flags & VM_LOCKED && !PageTransCompound(page))
> > +			mlock_vma_page(page);
> 
> Why do you only do this for file pages?

Because file pages are locked already, right?

-- 
 Kirill A. Shutemov