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Subject: Re: [PATCHv8 02/34] lib/vdso: make do_hres and do_coarse as
 __always_inline
To:     Dmitry Safonov <dima@arista.com>, linux-kernel@vger.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@gmail.com>,
        Andrei Vagin <avagin@gmail.com>,
        Adrian Reber <adrian@lisas.de>,
        Andrei Vagin <avagin@openvz.org>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Cyrill Gorcunov <gorcunov@openvz.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Jann Horn <jannh@google.com>, Jeff Dike <jdike@addtoit.com>,
        Oleg Nesterov <oleg@redhat.com>,
        Pavel Emelyanov <xemul@virtuozzo.com>,
        Shuah Khan <shuah@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        containers@lists.linux-foundation.org, criu@openvz.org,
        linux-api@vger.kernel.org, x86@kernel.org
References: <20191112012724.250792-1-dima@arista.com>
 <20191112012724.250792-3-dima@arista.com>
From:   Vincenzo Frascino <vincenzo.frascino@arm.com>
Message-ID: <ed2e65ae-75b0-ed79-0a95-90be6b82e6be@arm.com>
Date:   Fri, 10 Jan 2020 09:45:50 +0000
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On 11/12/19 1:26 AM, Dmitry Safonov wrote:
> +» » vd·=·&vd[CS_HRES_COARSE];
> +out_hres:
> +» » return·do_hres(vd,·clock,·ts);
> » }·else·if·(msk·&·VDSO_COARSE)·{
> » » do_coarse(&vd[CS_HRES_COARSE],·clock,·ts);
> » » return·0;
> » }·else·if·(msk·&·VDSO_RAW)·{
> -» » return·do_hres(&vd[CS_RAW],·clock,·ts);
> +» » vd·=·&vd[CS_RAW];
> +» » /*·goto·allows·to·avoid·extra·inlining·of·do_hres.·*/
> +» » goto·out_hres;

What is the performance impact of "goto out_hres"?

-- 
Regards,
Vincenzo