From: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] [RFC] powerpc: Add VDSO version of time
Date: Fri, 05 Apr 2013 15:49:53 -0300 [thread overview]
Message-ID: <515F1CD1.1030108@linux.vnet.ibm.com> (raw)
In-Reply-To: <20130405062137.GA5082@concordia>
On 04/05/2013 03:21 AM, Michael Ellerman wrote:
> 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?
I haven't test it yet and I believe it won't be troublesome to do so.
>
> What happens if I don't have the glibc patch?
GLIBC current behavior is to use the syscall.
>
> cheers
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
next prev parent reply other threads:[~2013-04-05 18:51 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
2013-04-05 18:49 ` Adhemerval Zanella [this message]
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=515F1CD1.1030108@linux.vnet.ibm.com \
--to=azanella@linux.vnet.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.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.