From: Mike Day <ncmike@ncultra.org>
To: Paolo Bonzini <pbonzini@redhat.com>, Alex Bligh <alex@alex.org.uk>
Cc: Ping Fan Liu <pingfank@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
qemu-devel@nongnu.org, Anthony Liguori <anthony@codemonkey.ws>
Subject: Re: [Qemu-devel] [PATCH v4 2/3] qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe
Date: Mon, 07 Oct 2013 12:14:05 -0400 [thread overview]
Message-ID: <877gdpys6q.fsf@pixel.localdomain> (raw)
In-Reply-To: <5252A725.6020700@redhat.com>
Paolo Bonzini <pbonzini@redhat.com> writes:
> Il 30/09/2013 15:34, Alex Bligh ha scritto:
>>
>> I think the most likely change here is that the walkers might
>> move outside the BQL. Given modification of this list is so rare,
>> the lock would be very very read heavy, so RCU is probably a
>> sensible option.
>
> I agree. Keeping the write side on the BQL is sane, but RCU-protecting
> the read side actually makes the rules simpler.
>
> Mike, would you like to give it a shot?
Yes, I will. I'll have a patchset for review within a couple of days.
Mike
--
Mike Day | + 1 919 371-8786 | ncmike@ncultra.org
"Endurance is a Virtue"
next prev parent reply other threads:[~2013-10-07 16:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-12 9:02 [Qemu-devel] [PATCH v4 0/3] qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe Stefan Hajnoczi
2013-09-12 9:02 ` [Qemu-devel] [PATCH v4 1/3] qemu-timer: drop outdated signal safety comments Stefan Hajnoczi
2013-09-12 9:02 ` [Qemu-devel] [PATCH v4 2/3] qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe Stefan Hajnoczi
2013-09-30 12:45 ` Mike Day
2013-09-30 12:55 ` Alex Bligh
2013-09-30 13:18 ` Mike Day
2013-09-30 13:34 ` Alex Bligh
2013-09-30 14:31 ` Mike Day
2013-10-07 12:20 ` Paolo Bonzini
2013-10-07 16:14 ` Mike Day [this message]
2013-09-12 9:02 ` [Qemu-devel] [PATCH v4 3/3] qemu-timer: do not take the lock in timer_pending Stefan Hajnoczi
2013-09-18 13:51 ` [Qemu-devel] [PATCH v4 0/3] qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safe Stefan Hajnoczi
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