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| author |   Alex Williamson <alex.williamson@redhat.com> | 2024-02-29 15:35:40 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2024-03-04 16:11:07 -0700 |
| commit | 5b992412776cdf2ec88b5b5138112e6b36e47995 (patch) | |
| tree | 0f42d6ffbf689dbac9fcbe555627ab437264ff54 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | vfio/nvgrace-gpu: Convey kvm to map device memory region as noncached (diff) | |
| download | wireguard-linux-5b992412776cdf2ec88b5b5138112e6b36e47995.tar.xz wireguard-linux-5b992412776cdf2ec88b5b5138112e6b36e47995.zip | |
Revert "vfio/type1: Unpin zero pages"
This reverts commit 873aefb376bbc0ed1dd2381ea1d6ec88106fdbd4.
This was a heinous workaround and it turns out it's been fixed in mm
twice since it was introduced. Most recently, commit c8070b787519
("mm: Don't pin ZERO_PAGE in pin_user_pages()") would have prevented
running up the zeropage refcount, but even before that commit
84209e87c696 ("mm/gup: reliable R/O long-term pinning in COW mappings")
avoids the vfio use case from pinning the zeropage at all, instead
replacing it with exclusive anonymous pages.
Remove this now useless overhead.
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240229223544.257207-1-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions