linux-kernel - Re: [PATCH v2 7/8] mm: refactor __mmap

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Message-ID: <1ba2aafb-468d-4f99-9a89-672581ff7e4c@suse.cz>
Date: Fri, 25 Oct 2024 12:23:46 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jann Horn <jannh@...gle.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Linus Torvalds <torvalds@...ux-foundation.org>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v2 7/8] mm: refactor __mmap_region()

On 10/25/24 12:19, Lorenzo Stoakes wrote:
> On Fri, Oct 25, 2024 at 10:35:20AM +0200, Vlastimil Babka wrote:
>> >
>> >  	/* Lock the VMA since it is modified after insertion into VMA tree */
>> >  	vma_start_write(vma);
>> > -	vma_iter_store(&vmi, vma);
>> > -	mm->map_count++;
>> > +	vma_iter_store(vmi, vma);
>> > +	map->mm->map_count++;
>> >  	vma_link_file(vma);
>> >
>> >  	/*
>> >  	 * vma_merge_new_range() calls khugepaged_enter_vma() too, the below
>> >  	 * call covers the non-merge case.
>> >  	 */
>> > -	khugepaged_enter_vma(vma, vma->vm_flags);
>> > +	khugepaged_enter_vma(vma, map->flags);
>> >
>> >  file_expanded:
>> > -	file = vma->vm_file;
>> >  	ksm_add_vma(vma);
>>
>> I'm wondering if this could go to the "non file expanded" region above. If
>> we expanded a vma, it was either in ksm and stays in ksm, or it was not
>> eligible and that couldn't have changed by expanding?
> 
> We could change this, but the next commit removes the need for this :)

Yeah, no need to change here then.