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| author | Will Deacon <will.deacon@arm.com> | 2016-02-02 12:46:23 +0000 |
|---|---|---|
| committer | Jeff Vander Stoep <jeffv@google.com> | 2016-09-22 13:38:22 -0700 |
| commit | 58ffa07081e1aabd092257eb6f2fb718dcd3d486 (patch) | |
| tree | 0d4cc1870ed0ae76cd4519151ba4e2216009f0ad /tools/perf/scripts/python/syscall-counts.py | |
| parent | 0b0254ded773d1f241b1ae7c7fdb137a72f60911 (diff) | |
UPSTREAM: arm64: prefetch: don't provide spin_lock_prefetch with LSE
The LSE atomics rely on us not dirtying data at L1 if we can avoid it,
otherwise many of the potential scalability benefits are lost.
This patch replaces spin_lock_prefetch with a nop when the LSE atomics
are in use, so that users don't shoot themselves in the foot by causing
needless coherence traffic at L1.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Tested-by: Andrew Pinski <apinski@cavium.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 30369029
Patchset: kaslr-arm64-4.4
(cherry picked from commit cd5e10bdf3795d22f10787bb1991c43798c885d5)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: Ib8bc3f38d9306c13e017139ae4f2a7c8d6b61e18
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions