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Re: [Xen-devel] [RFC][PATCH] walking the page lists needs the page_alloc
| To: | Jan Beulich <JBeulich@xxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [RFC][PATCH] walking the page lists needs the page_alloc lock |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 13 Aug 2010 07:46:40 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 12 Aug 2010 23:47:34 -0700 |
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| Thread-index: | Acs6smMDZ30AlpdkTGma/UOuwrftEgAAOV6W |
| Thread-topic: | [Xen-devel] [RFC][PATCH] walking the page lists needs the page_alloc lock |
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On 13/08/2010 07:40, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: >> Sorry, my intention was to say that changes to the debug-key printouts >> are safe, not that they didn't require changes. >> >> The debug-key printouts (in particular the NUMA one) are where I >> actually hit this bug on a running system. > > But then, to avoid a hanging system, these should be trylock-s > rather than plain locks, shouldn't they? Why? The handler is called in softirq context. It should be safe to spin. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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