From: "Jan Beulich" <JBeulich@suse.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: andrew.cooper3@citrix.com, malcolm.crossley@citrix.com,
xen-devel@lists.xenproject.org, linux@eikelenboom.it
Subject: Re: [RFC PATCH] dpci: Put the dpci back on the list if running on another CPU.
Date: Wed, 18 Mar 2015 07:41:55 +0000 [thread overview]
Message-ID: <55093A53020000780006B1D8@mail.emea.novell.com> (raw)
In-Reply-To: <20150317174454.GA16436@l.oracle.com>
>>> On 17.03.15 at 18:44, <konrad.wilk@oracle.com> wrote:
> As you can see to preserve the existing functionality such as
> being able to schedule N amount of interrupt injections
> for the N interrupts we might get - I modified '->masked'
> to be an atomic counter.
Why would that be? When an earlier interrupt wasn't fully handled,
real hardware wouldn't latch more than one further instance either.
> The end result is that we can still live-lock. Unless we:
> - Drop on the floor the injection of N interrupts and
> just deliever at max one per VMX_EXIT (and not bother
> with interrupts arriving when we are in the VMX handler).
I'm afraid I again don't see the point here.
> - Alter the softirq code slightly - to have an variant
> which will only iterate once over the pending softirq
> bits per call. (so save an copy of the bitmap on the
> stack when entering the softirq handler - and use that.
> We could also xor it against the current to catch any
> non-duplicate bits being set that we should deal with).
That's clearly not an option: The solution should be isolated
to DPCI code, i.e. without altering existing behavior in other
(more generic) components.
Jan
next prev parent reply other threads:[~2015-03-18 7:41 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-12 16:45 [RFC PATCH] dpci: Put the dpci back on the list if running on another CPU Konrad Rzeszutek Wilk
2015-01-12 17:27 ` Sander Eikelenboom
2015-01-12 17:35 ` Konrad Rzeszutek Wilk
2015-01-13 10:26 ` Jan Beulich
2015-01-13 10:20 ` Jan Beulich
2015-01-23 1:44 ` Konrad Rzeszutek Wilk
2015-01-23 9:37 ` Jan Beulich
2015-01-23 14:54 ` Konrad Rzeszutek Wilk
2015-03-17 17:44 ` Konrad Rzeszutek Wilk
2015-03-17 22:16 ` Sander Eikelenboom
2015-03-18 7:41 ` Jan Beulich [this message]
2015-03-18 14:06 ` Konrad Rzeszutek Wilk
2015-03-18 16:43 ` Jan Beulich
2015-03-18 17:00 ` Konrad Rzeszutek Wilk
2015-03-19 7:15 ` Jan Beulich
2015-02-02 14:29 ` Konrad Rzeszutek Wilk
2015-02-02 15:19 ` Jan Beulich
2015-02-02 15:31 ` Konrad Rzeszutek Wilk
2015-02-02 15:48 ` Jan Beulich
2015-02-02 17:44 ` Konrad Rzeszutek Wilk
2015-02-03 8:58 ` Jan Beulich
2015-03-16 17:59 ` Konrad Rzeszutek Wilk
2015-03-17 8:18 ` Jan Beulich
2015-03-17 8:42 ` Sander Eikelenboom
2015-03-17 14:54 ` Konrad Rzeszutek Wilk
2015-03-17 16:01 ` Jan Beulich
2015-03-17 16:09 ` Konrad Rzeszutek Wilk
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