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

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Message-Id: <20210413203352.71350-1-eric.dumazet@gmail.com>
Date:   Tue, 13 Apr 2021 13:33:49 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     "Paul E . McKenney" <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>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v3 0/3] rseq: minor optimizations

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 !

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