From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: [patch 2/2] powerpc: optimise smp_wmb
Date: Wed, 21 May 2008 11:43:00 -0400 [thread overview]
Message-ID: <1211384580.8297.199.camel@pasglop> (raw)
In-Reply-To: <20080521153420.GG8897@wotan.suse.de>
On Wed, 2008-05-21 at 17:34 +0200, Nick Piggin wrote:
> On Wed, May 21, 2008 at 11:26:32AM -0400, Benjamin Herrenschmidt wrote:
> >
> > On Wed, 2008-05-21 at 16:12 +0200, Nick Piggin wrote:
> > > lwsync is the recommended method of store/store ordering on caching enabled
> > > memory. For those subarchs which have lwsync, use it rather than eieio for
> > > smp_wmb.
> >
> > Yuck... existence of lwsync depends on the processor at boot time...
>
> Not according to the __stringify(LWSYNC) that I just removed. At least,
> presumably it is always present on 64 bit processors, and 32 bit ones
> will be no worse off as they'll continue just using eieio.
No, it doesn't exist on power3, but it degrades into a sync
Ben.
next prev parent reply other threads:[~2008-05-21 15:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-21 14:10 [patch 1/2] powerpc: rmb fix Nick Piggin
2008-05-21 14:12 ` [patch 2/2] powerpc: optimise smp_wmb Nick Piggin
2008-05-21 15:26 ` Benjamin Herrenschmidt
2008-05-21 15:34 ` Nick Piggin
2008-05-21 15:43 ` Benjamin Herrenschmidt [this message]
2008-05-21 15:47 ` Nick Piggin
2008-05-21 16:02 ` Benjamin Herrenschmidt
2008-05-21 20:51 ` Segher Boessenkool
2008-05-21 16:01 ` Nick Piggin
2008-05-21 20:12 ` Segher Boessenkool
2008-05-21 20:44 ` Benjamin Herrenschmidt
2008-05-21 22:07 ` Segher Boessenkool
2008-05-22 0:30 ` Nick Piggin
2008-05-21 20:16 ` Segher Boessenkool
2008-05-21 15:27 ` [patch 1/2] powerpc: rmb fix Benjamin Herrenschmidt
2008-05-21 15:32 ` Nick Piggin
2008-05-21 15:43 ` Benjamin Herrenschmidt
2008-05-23 2:14 ` Paul Mackerras
2008-05-23 4:40 ` Nick Piggin
2008-05-23 4:53 ` Paul Mackerras
2008-05-23 5:48 ` Nick Piggin
2008-05-23 6:40 ` Paul Mackerras
2008-05-26 1:38 ` Nick Piggin
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=1211384580.8297.199.camel@pasglop \
--to=benh@kernel.crashing.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=npiggin@suse.de \
--cc=paulus@samba.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.