Re: [PATCH v2 4/7] mm/mremap: initial refactor of move_vma()

[Vlastimil Babka <vbabka@suse.cz>]

On 3/6/25 11:34, Lorenzo Stoakes wrote:
> Update move_vma() to use the threaded VRM object, de-duplicate code and
> separate into smaller functions to aid readability and debug-ability.
> 
> This in turn allows further simplification of expand_vma() as we can
> simply thread VRM through the function.
> 
> We also take the opportunity to abstract the account charging page count
> into the VRM in order that we can correctly thread this through the
> operation.
> 
> We additionally do the same for tracking mm statistics - exec_vm,
> stack_vm, data_vm, and locked_vm.
> 
> As part of this change, we slightly modify when locked pages statistics
> are counted for in mm_struct statistics.  However this should cause no
> issues, as there is no chance of underflow, nor will any rlimit failures
> occur as a result.
> 
> This is an intermediate step before a further refactoring of move_vma() in
> order to aid review.
> 
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
> Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

Can't wait what the bots report what I've missed in this one.