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 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).