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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e40fea9d-7e1d-ea61-7a7f-f5bef8bac02e@twiddle.net \
--to=rth@twiddle.net \
--cc=Vijaya.Kumar@cavium.com \
--cc=pbonzini@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=qemu-arm@nongnu.org \
--cc=qemu-devel@nongnu.org \
--cc=vijay.kilari@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).