]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mmap: change zeroing of maple tree in __vma_adjust()
authorLiam R. Howlett <Liam.Howlett@Oracle.com>
Tue, 21 Jun 2022 20:46:57 +0000 (20:46 +0000)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Wed, 20 Jul 2022 00:02:48 +0000 (20:02 -0400)
commit8c1e7c64720c645198d4aed657f465eea7f6c7d0
treec97db7ae0ad84312d41bead8982145318548b932
parent2d6b7cd6fe3fd9efb88d8c9fc1ac470c797494bc
mmap: change zeroing of maple tree in __vma_adjust()

Only write to the maple tree if we are not inserting or the insert isn't
going to overwrite the area to clear.  This avoids spanning writes and
node coealescing when unnecessary.

The change requires a custom search for the linked list addition to find
the correct VMA for the prev link.

Link: https://lkml.kernel.org/r/20220504011345.662299-3-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-19-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/mmap.c