From: Richard Henderson <rth@twiddle.net>
To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Cc: agraf@suse.de
Subject: Re: [Qemu-devel] [PATCH 3/3] target-ppc: use separate indices for various translation modes
Date: Fri, 20 Feb 2015 11:54:35 -0800 [thread overview]
Message-ID: <54E790FB.701@twiddle.net> (raw)
In-Reply-To: <1424455040-3335-4-git-send-email-pbonzini@redhat.com>
On 02/20/2015 09:57 AM, Paolo Bonzini wrote:
> PowerPC TCG flushes the TLB on every IR/DR change, which basically
> means on every user<->kernel context switch. Encode IR/DR in the
> MMU index.
>
> This brings the number of TLB flushes down from ~900000 to ~50000
> for starting up the Debian installer, which is in line with x86
> and gives a ~10% performance improvement.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> target-ppc/cpu.h | 12 +++++++-----
> target-ppc/excp_helper.c | 3 ---
> target-ppc/helper_regs.h | 15 +++++++++------
> 3 files changed, 16 insertions(+), 14 deletions(-)
I'm not an expert on ppc memory management, but it certainly LGTM.
r~
next prev parent reply other threads:[~2015-02-20 19:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 17:57 [Qemu-devel] [PATCH v2 for-2.3 0/3] Support more than 8 MMU modes, speedup PPC by 10% Paolo Bonzini
2015-02-20 17:57 ` [Qemu-devel] [PATCH 1/3] tcg: add TCG_TARGET_TLB_DISPLACEMENT_BITS Paolo Bonzini
2015-02-20 19:36 ` Richard Henderson
2015-02-23 15:21 ` Alexander Graf
2015-02-23 16:03 ` Richard Henderson
2015-02-20 17:57 ` [Qemu-devel] [PATCH 2/3] softmmu: support up to 12 MMU modes Paolo Bonzini
2015-02-20 19:51 ` Richard Henderson
2015-02-20 17:57 ` [Qemu-devel] [PATCH 3/3] target-ppc: use separate indices for various translation modes Paolo Bonzini
2015-02-20 19:54 ` Richard Henderson [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-02-20 12:45 [Qemu-devel] [PATCH for-2.3 0/3] Support more than 8 MMU modes, speedup by 10% Paolo Bonzini
2015-02-20 12:45 ` [Qemu-devel] [PATCH 3/3] target-ppc: use separate indices for various translation modes Paolo Bonzini
2015-02-20 13:00 ` Alexander Graf
2015-02-20 17:58 ` Paolo Bonzini
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=54E790FB.701@twiddle.net \
--to=rth@twiddle.net \
--cc=agraf@suse.de \
--cc=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.