[PATCH] audit: speedup for syscalls when auditing is disabled

[Miloslav Trmac]

----- "Eric Paris" <eparis at redhat.com> wrote:
> Add a new spot in the assembly which will call a function which will
> check if audit_n_rules > 0 and if so will set TIF_SYSCALL_AUDIT and if
> not will clear TIF_SYSCALL_AUDIT?  It might make things slightly worse
> on systems which explictly disable audit and the flag would always be
> clear on every task (like you did with the explicit rule) but I'm
> guessing might be a win on systems with no rules which are wasting time
> on the audit slow path.....
Is "audit_n_rules" a specific enough trigger?  Right now, even if there are no rules configured at all, audit_log_start() while processing a syscall will mark that syscall for auditing, and all collected information about the syscall will be logged at syscall exit.

Would the suggested change break this behavior?
    Mirek