From: Richard Henderson <rth@twiddle.net>
To: vijay.kilari@gmail.com, qemu-arm@nongnu.org,
peter.maydell@linaro.org, pbonzini@redhat.com
Cc: qemu-devel@nongnu.org, Vijaya Kumar K <Vijaya.Kumar@cavium.com>
Subject: Re: [Qemu-devel] [PATCH v3 1/3] cutils: Set __builtin_prefetch optional parameters
Date: Mon, 24 Oct 2016 08:43:36 -0700 [thread overview]
Message-ID: <e40fea9d-7e1d-ea61-7a7f-f5bef8bac02e@twiddle.net> (raw)
In-Reply-To: <1477288523-10819-2-git-send-email-vijay.kilari@gmail.com>
On 10/23/2016 10:55 PM, vijay.kilari@gmail.com wrote:
> From: Vijaya Kumar K <Vijaya.Kumar@cavium.com>
>
> Optional parameters of __builtin_prefetch() which specifies
> rw and locality to 0's. For checking buffer is zero, set rw as read
> and temporal locality to 0.
>
> On arm64, __builtin_prefetch(addr) generates 'prfm pldl1keep'
> where __builtin_prefetch(addr, 0, 0) generates 'prfm pldl1strm'
> instruction which is optimal for this use case
>
> Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@cavium.com>
> ---
Reviewed-by: Richard Henderson <rth@twiddle.net>
r~
next prev parent reply other threads:[~2016-10-24 15:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-24 5:55 [Qemu-devel] [PATCH v3 0/3] Live migration optimization for Thunderx platform vijay.kilari
2016-10-24 5:55 ` [Qemu-devel] [PATCH v3 1/3] cutils: Set __builtin_prefetch optional parameters vijay.kilari
2016-10-24 15:43 ` Richard Henderson [this message]
2016-10-24 5:55 ` [Qemu-devel] [PATCH v3 2/3] utils: Add helper to read arm MIDR_EL1 register vijay.kilari
2016-10-24 9:39 ` Dr. David Alan Gilbert
2016-10-24 10:20 ` Vijay Kilari
2016-10-24 11:26 ` Paolo Bonzini
2016-10-24 15:47 ` Richard Henderson
2016-10-24 5:55 ` [Qemu-devel] [PATCH v3 3/3] utils: Add prefetch for Thunderx platform vijay.kilari
2016-10-24 11:25 ` Paolo Bonzini
2016-10-24 15:51 ` Richard Henderson
2016-10-24 15:47 ` [Qemu-devel] [PATCH v3 0/3] Live migration optimization " Richard Henderson
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