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| author |   Christopher M. Riedl <cmr@codefail.de> | 2021-02-26 19:12:56 -0600 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 12:49:47 +1100 |
| commit | 193323e1009437c0885240e75ca71f7963e4a006 (patch) | |
| tree | 4bda5c53393540d31b4da2bbe81edd3bb8892362 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | powerpc/signal64: Replace setup_sigcontext() w/ unsafe_setup_sigcontext() (diff) | |
powerpc/signal64: Replace restore_sigcontext() w/ unsafe_restore_sigcontext()
Previously restore_sigcontext() performed a costly KUAP switch on every
uaccess operation. These repeated uaccess switches cause a significant
drop in signal handling performance.
Rewrite restore_sigcontext() to assume that a userspace read access
window is open by replacing all uaccess functions with their 'unsafe'
versions. Modify the callers to first open, call
unsafe_restore_sigcontext(), and then close the uaccess window.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210227011259.11992-8-cmr@codefail.de
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
0 files changed, 0 insertions, 0 deletions