Re: [PATCH v2 00/25] powerpc: Switch signal 32 to using unsafe_put_user() and friends

2020-12-10 Thread Michael Ellerman
On Tue, 18 Aug 2020 17:19:11 + (UTC), Christophe Leroy wrote: > This series leads to a reduction from 2.55s to 1.73s of > the system CPU time with the following microbench app > on an mpc832x with KUAP (approx 32%) > > This series replaces copies to users by unsafe_put_user() and friends > wit

[PATCH v2 00/25] powerpc: Switch signal 32 to using unsafe_put_user() and friends

2020-08-18 Thread Christophe Leroy
This series leads to a reduction from 2.55s to 1.73s of the system CPU time with the following microbench app on an mpc832x with KUAP (approx 32%) This series replaces copies to users by unsafe_put_user() and friends with user_write_access_begin() dance in signal32. The advantages are: - No KUAP