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[RFC,0/4] Optimize mremap during mutual alignment within PMD

Message ID 20230518021825.712742-1-joel@joelfernandes.org (mailing list archive)
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Series Optimize mremap during mutual alignment within PMD | expand

Message

Joel Fernandes May 18, 2023, 2:18 a.m. UTC 
Hello,

I am posting this as an RFC for any feedback. I have tested them suitably and I
am continuing to test them.

These patches optimizes the start addresses in move_page_tables(). It addresses a
warning [1] that occurs due to a downward, overlapping move on a mutually-aligned
offset within a PMD during exec. By initiating the copy process at the PMD
level when such alignment is present, we can prevent this warning and speed up
the copying process at the same time. Linus Torvalds suggested this idea.

Please check the individual patches for more details.

thanks,

 - Joel

[1] https://lore.kernel.org/all/ZB2GTBD%2FLWTrkOiO@dhcp22.suse.cz/

Joel Fernandes (Google) (4):
mm/mremap: Optimize the start addresses in move_page_tables()
selftests: mm: Fix failure case when new remap region was not found
selftests: mm: Add a test for mutually aligned moves > PMD size
selftests: mm: Add a test for remapping to area immediately after
existing mapping

mm/mremap.c                              | 49 +++++++++++++++++
tools/testing/selftests/mm/mremap_test.c | 69 +++++++++++++++++++++---
2 files changed, 112 insertions(+), 6 deletions(-)

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2.40.1.606.ga4b1b128d6-goog