diff options
| author | Christopher M. Riedl <[email protected]> | 2021-02-26 19:12:55 -0600 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2021-03-29 12:49:47 +1100 |
| commit | 7bb081c8f043ab166f8c6f26fca744821217dad7 (patch) | |
| tree | b1f248e8daa0aa35ea73d7bf674c2a22723ae0b6 /tools/perf/scripts/python/bin | |
| parent | 2d19630e20fe5fbd5813f73fd5b1c81ddec61369 (diff) | |
powerpc/signal64: Replace setup_sigcontext() w/ unsafe_setup_sigcontext()
Previously setup_sigcontext() performed a costly KUAP switch on every
uaccess operation. These repeated uaccess switches cause a significant
drop in signal handling performance.
Rewrite setup_sigcontext() to assume that a userspace write access window
is open by replacing all uaccess functions with their 'unsafe' versions.
Modify the callers to first open, call unsafe_setup_sigcontext() and
then close the uaccess window.
Signed-off-by: Christopher M. Riedl <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/bin')
0 files changed, 0 insertions, 0 deletions