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| author | Maciej S. Szmigiero <[email protected]> | 2021-12-06 20:54:24 +0100 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2021-12-08 04:24:29 -0500 |
| commit | f5756029eef501bcd39ecd844968e4fb3055c1bd (patch) | |
| tree | 9f7dd1e532ea6afb5bf53ae9926d043c4785b8b9 /tools/perf/scripts/python/stackcollapse.py | |
| parent | e0c2b6338ac8ca30d438157dc45396c3c1148563 (diff) | |
KVM: x86: Use nr_memslot_pages to avoid traversing the memslots array
There is no point in recalculating from scratch the total number of pages
in all memslots each time a memslot is created or deleted. Use KVM's
cached nr_memslot_pages to compute the default max number of MMU pages.
Note that even with nr_memslot_pages capped at ULONG_MAX we can't safely
multiply it by KVM_PERMILLE_MMU_PAGES (20) since this operation can
possibly overflow an unsigned long variable.
Write this "* 20 / 1000" operation as "/ 50" instead to avoid such
overflow.
Signed-off-by: Maciej S. Szmigiero <[email protected]>
[sean: use common KVM field and rework changelog accordingly]
Reviewed-by: Sean Christopherson <[email protected]>
Message-Id: <d14c5a24535269606675437d5602b7dac4ad8c0e.1638817640.git.maciej.szmigiero@oracle.com>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions