linux-kernel - Re: [PATCH v2] audit: unify audit_filter_{uring(),inode

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Date:   Thu, 13 Oct 2022 19:11:50 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Ankur Arora <ankur.a.arora@...cle.com>
Cc:     linux-audit@...hat.com, eparis@...hat.com, sgrubb@...hat.com,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: Re: [PATCH v2] audit: unify audit_filter_{uring(),inode_name(),syscall()}

On Thu, Oct 6, 2022 at 8:49 PM Ankur Arora <ankur.a.arora@...cle.com> wrote:
>
> audit_filter_uring(), audit_filter_inode_name() are substantially
> similar to audit_filter_syscall(). Move the core logic to
> __audit_filter_op() which can be parametrized for all three.
>
> On a Skylakex system, getpid() latency (all results aggregated
> across 12 boot cycles):
>
>          Min     Mean    Median   Max      pstdev
>          (ns)    (ns)    (ns)     (ns)
>
>  -    196.63   207.86  206.60  230.98      (+- 3.92%)
>  +    183.73   196.95  192.31  232.49      (+- 6.04%)
>
> Performance counter stats for 'bin/getpid' (3 runs) go from:
>     cycles               805.58  (  +-  4.11% )
>     instructions        1654.11  (  +-   .05% )
>     IPC                    2.06  (  +-  3.39% )
>     branches             430.02  (  +-   .05% )
>     branch-misses          1.55  (  +-  7.09% )
>     L1-dcache-loads      440.01  (  +-   .09% )
>     L1-dcache-load-misses  9.05  (  +- 74.03% )
> to:
>     cycles               765.37  (  +-  6.66% )
>     instructions        1677.07  (  +-  0.04% )
>     IPC                    2.20  (  +-  5.90% )
>     branches             431.10  (  +-  0.04% )
>     branch-misses          1.60  (  +- 11.25% )
>     L1-dcache-loads      521.04  (  +-  0.05% )
>     L1-dcache-load-misses  6.92  (  +- 77.60% )
>
> (Both aggregated over 12 boot cycles.)
>
> The increased L1-dcache-loads are due to some intermediate values now
> coming from the stack.
>
> The improvement in cycles is due to a slightly denser loop (the list
> parameter in the list_for_each_entry_rcu() exit check now comes from
> a register rather than a constant as before.)
>
> Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
> ---
>  kernel/auditsc.c | 76 +++++++++++++++++++++++++-----------------------
>  1 file changed, 39 insertions(+), 37 deletions(-)

Thanks, this looks good to me.  I'll queue this up for when the merge
window closes.

-- 
paul-moore.com