From: Michael Ellerman <michael@ellerman•id.au>
To: Adhemerval Zanella <azanella@linux•vnet.ibm.com>
Cc: linuxppc-dev@lists•ozlabs.org
Subject: Re: [PATCH] [RFC] powerpc: Add VDSO version of time
Date: Fri, 5 Apr 2013 17:21:37 +1100 [thread overview]
Message-ID: <20130405062137.GA5082@concordia> (raw)
In-Reply-To: <5148C2B3.6010408@linux.vnet.ibm.com>
On Tue, Mar 19, 2013 at 04:55:31PM -0300, Adhemerval Zanella wrote:
> Hi all,
>
> This patch implement the time syscall as vDSO. I have a glibc patch
> to use it as IFUNC (as latest gettimeofday patch). Below the perf
> numbers:
>
> Baseline PPC32: 380 nsec
> Baseline PPC64: 352 nsec
> vdso PPC32: 20 nsec
> vdso PPC64: 20 nsec
>
> I focused on 64 bit kernel, do I need to provide a scheme for 32 bits
> as well?
You did provide a 32-bit implementation. I take it you haven't tested
that though? Can you test it?
What happens if I don't have the glibc patch?
cheers
next prev parent reply other threads:[~2013-04-05 6:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-19 19:55 [PATCH] [RFC] powerpc: Add VDSO version of time Adhemerval Zanella
2013-03-20 5:00 ` Benjamin Herrenschmidt
2013-03-21 13:40 ` Adhemerval Zanella
2013-03-26 17:32 ` Adhemerval Zanella
2013-04-04 19:22 ` Adhemerval Zanella
2013-04-05 6:21 ` Michael Ellerman [this message]
2013-04-05 18:49 ` Adhemerval Zanella
2013-04-08 14:05 ` Adhemerval Zanella
2013-04-18 5:58 ` Michael Ellerman
2013-04-18 22:38 ` Anton Blanchard
2013-04-22 19:29 ` Adhemerval Zanella
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=20130405062137.GA5082@concordia \
--to=michael@ellerman$(echo .)id.au \
--cc=azanella@linux$(echo .)vnet.ibm.com \
--cc=linuxppc-dev@lists$(echo .)ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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