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Message-ID: <55ACD19F.3050106@suse.com> Date: Mon, 20 Jul 2015 12:46:55 +0200 From: Juergen Gross <jgross@...e.com> To: David Vrabel <david.vrabel@...rix.com>, linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com, konrad.wilk@...cle.com, boris.ostrovsky@...cle.com Subject: Re: [Xen-devel] [PATCH] xen: release lock occasionally during ballooning On 07/20/2015 12:15 PM, David Vrabel wrote: > On 10/07/15 15:42, Juergen Gross wrote: >> When dom0 is being ballooned balloon_process() will hold the balloon >> mutex until it is finished. This will block e.g. creation of new >> domains as the device backends for the new domain need some >> autoballooned pages for the ring buffers. >> >> Avoid this by releasing the balloon mutex from time to time during >> ballooning. Add a state variable to indicate one balloon_process() >> is active to avoid multiple balloon processes fighting for the mutex. > > Is this state variable necessary? balloon_process() is a work item so > there should only be one instance of it running anyway, yes? Hmm, yes. I've been following the comment above balloon_process() which suggested the possibility of multiple active instances. I'll send another version of the patch with an updated comment and removed state variable. Juergen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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