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mm/mmap: Change do_brk_flags() to expand existing VMA and add
authorLiam R. Howlett <Liam.Howlett@Oracle.com>
Mon, 21 Sep 2020 14:47:34 +0000 (10:47 -0400)
committerLiam R. Howlett <Liam.Howlett@Oracle.com>
Thu, 28 Jan 2021 01:49:02 +0000 (20:49 -0500)
commit88950a8d5b78a2c5667d359f4ad368742d1cd993
treecbe9265f5eb206037d5de58e5fead9f95499efcatree
parent49a624b21b427e4fb4a9e54c8fe6533f2b8272c9commit | diff
mm/mmap: Change do_brk_flags() to expand existing VMA and add
do_brk_munmap()

Avoid allocating a new VMA when it is not necessary.  Expand or contract
the existing VMA instead.  This avoids unnecessary tree manipulations
and allocations.

Once the VMA is known, use it directly when populating to avoid
unnecessary lookup work.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
mm/mmap.c diff | blob | history
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