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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Christophe Leroy <christophe.leroy@csgroup.eu>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        dima@arista.com, avagin@gmail.com, arnd@arndb.de,
        vincenzo.frascino@arm.com, luto@kernel.org,
        linux-arch@vger.kernel.org
Subject: Re: [PATCH RESEND v1 1/4] lib/vdso: Mark do_hres_timens() and do_coarse_timens() __always_inline()
In-Reply-To: <90dcf45ebadfd5a07f24241551c62f619d1cb930.1617209142.git.christophe.leroy@csgroup.eu>
References: <cover.1617209141.git.christophe.leroy@csgroup.eu> <90dcf45ebadfd5a07f24241551c62f619d1cb930.1617209142.git.christophe.leroy@csgroup.eu>
Date:   Mon, 12 Apr 2021 14:47:49 +0200
Message-ID: <87r1jf1xfu.ffs@nanos.tec.linutronix.de>
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On Wed, Mar 31 2021 at 16:48, Christophe Leroy wrote:
> In the same spirit as commit c966533f8c6c ("lib/vdso: Mark do_hres()
> and do_coarse() as __always_inline"), mark do_hres_timens() and
> do_coarse_timens() __always_inline.
>
> The measurement below in on a non timens process, ie on the fastest path.
>
> On powerpc32, without the patch:
>
> clock-gettime-monotonic-raw:    vdso: 1155 nsec/call
> clock-gettime-monotonic-coarse:    vdso: 813 nsec/call
> clock-gettime-monotonic:    vdso: 1076 nsec/call
>
> With the patch:
>
> clock-gettime-monotonic-raw:    vdso: 1100 nsec/call
> clock-gettime-monotonic-coarse:    vdso: 667 nsec/call
> clock-gettime-monotonic:    vdso: 1025 nsec/call
>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>