linux-kernel - Re: [PATCH v3 0/3] rseq: minor optimizations

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Date:   Tue, 13 Apr 2021 16:40:33 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        paulmck <paulmck@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
        Arjun Roy <arjunroy@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v3 0/3] rseq: minor optimizations

----- On Apr 13, 2021, at 4:33 PM, Eric Dumazet eric.dumazet@...il.com wrote:

> From: Eric Dumazet <edumazet@...gle.com>
> 
> rseq is a heavy user of copy to/from user data in fast paths.
> This series tries to reduce the cost.
> 
> v3: Third patch going back to v1 (only deal with 64bit arches)
> v2: Addressed Peter and Mathieu feedbacks, thanks !

For the whole series:

Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>

Thanks Eric!

Mathieu

> 
> Eric Dumazet (3):
>  rseq: optimize rseq_update_cpu_id()
>  rseq: remove redundant access_ok()
>  rseq: optimise rseq_get_rseq_cs() and clear_rseq_cs()
> 
> kernel/rseq.c | 29 +++++++++++++++++++++--------
> 1 file changed, 21 insertions(+), 8 deletions(-)
> 
> --
> 2.31.1.295.g9ea45b61b8-goog

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com