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Re: Hitachi djprobe mechanism
- From: Andi Kleen <ak at suse dot de>
- To: Richard J Moore <richardj_moore at uk dot ibm dot com>
- Cc: Andi Kleen <ak at suse dot de>,Mathieu Desnoyers <compudj at krystal dot dyndns dot org>,Masami Hiramatsu <hiramatu at sdl dot hitachi dot co dot jp>,Karim Yaghmour <karim at opersys dot com>,Masami Hiramatsu <masami dot hiramatsu at gmail dot com>,michel dot dagenais at polymtl dot ca, Roland McGrath <roland at redhat dot com>,Satoshi Oshima <soshima at redhat dot com>, sugita at sdl dot hitachi dot co dot jp,systemtap at sources dot redhat dot com
- Date: Fri, 29 Jul 2005 10:46:10 +0200
- Subject: Re: Hitachi djprobe mechanism
- References: <p73d5p2gi7o.fsf@bragg.suse.de> <OFA4F3B94A.1FCEDBA5-ON4125704D.002F1039-4125704D.002F853F@uk.ibm.com>
On Fri, Jul 29, 2005 at 09:39:03AM +0100, Richard J Moore wrote:
>
>
>
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> that's a very good point. cmpxchg is not always considered for atomic
> storing, though one does have to handle the complication of crossing page
> boundaries.
The CPU cancels and restarts the instruction in this case and everything is
atomic again.
-Andi