e0ffbaabc4
This splits syscall_trace_enter into syscall_trace_enter_phase1 and syscall_trace_enter_phase2. Only phase 2 has full pt_regs, and only phase 2 is permitted to modify any of pt_regs except for orig_ax. The intent is that phase 1 can be called from the syscall fast path. In this implementation, phase1 can handle any combination of TIF_NOHZ (RCU context tracking), TIF_SECCOMP, and TIF_SYSCALL_AUDIT, unless seccomp requests a ptrace event, in which case phase2 is forced. In principle, this could yield a big speedup for TIF_NOHZ as well as for TIF_SECCOMP if syscall exit work were similarly split up. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/2df320a600020fda055fccf2b668145729dd0c04.1409954077.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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| uapi/asm | ||