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 4BKo7oEk 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Oct 25, 2024 at 07:40:43PM +0200, Vlastimil Babka wrote: > On 10/25/24 14:26, Lorenzo Stoakes wrote: > > Rather than trying to merge again when ostensibly allocating a new VMA, > > instead defer until the VMA is added and attempt to merge the existing > > range. > > > > This way we have no complicated unwinding logic midway through the process > > of mapping the VMA. > > > > In addition this removes limitations on the VMA not being able to be the > > first in the virtual memory address space which was previously implicitly > > required. > > > > In theory, for this very same reason, we should unconditionally attempt > > merge here, however this is likely to have a performance impact so it is > > better to avoid this given the unlikely outcome of a merge. > > > > Reviewed-by: Vlastimil Babka > > Signed-off-by: Lorenzo Stoakes > > --- > > mm/vma.c | 55 ++++++++++++++----------------------------------------- > > 1 file changed, 14 insertions(+), 41 deletions(-) > > > > diff --git a/mm/vma.c b/mm/vma.c > > index 7c690be67910..7194f9449c60 100644 > > --- a/mm/vma.c > > +++ b/mm/vma.c > > @@ -19,6 +19,7 @@ struct mmap_state { > > struct file *file; > > > > unsigned long charged; > > + bool retry_merge; > > > > struct vm_area_struct *prev; > > struct vm_area_struct *next; > > @@ -2278,8 +2279,9 @@ static int __mmap_prepare(struct mmap_state *map, struct list_head *uf) > > return 0; > > } > > > > + > > static int __mmap_new_file_vma(struct mmap_state *map, > > - struct vm_area_struct **vmap, bool *mergedp) > > + struct vm_area_struct **vmap) > > AFAICS **vmap could become *vma now Ah yeah good spot you're right, will chase up on respin or do a fix-patch next week! > > > { > > struct vma_iterator *vmi = map->vmi; > > struct vm_area_struct *vma = *vmap;