Displaying 5 results from an estimated 5 matches for "atomicy".
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2016 Nov 25
3
[PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()
On Fri, Nov 25, 2016 at 12:33:48PM +0100, Christian Borntraeger wrote:
> On 11/25/2016 12:22 PM, Mark Rutland wrote:
> > On Thu, Nov 24, 2016 at 10:36:58PM +0200, Michael S. Tsirkin wrote:
> >> Though I really question the whole _ONCE APIs esp with
> >> aggregate types - these seem to generate a memcpy and
> >> an 8-byte read/writes sometimes, and I'm pretty
2016 Nov 25
3
[PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()
On Fri, Nov 25, 2016 at 12:33:48PM +0100, Christian Borntraeger wrote:
> On 11/25/2016 12:22 PM, Mark Rutland wrote:
> > On Thu, Nov 24, 2016 at 10:36:58PM +0200, Michael S. Tsirkin wrote:
> >> Though I really question the whole _ONCE APIs esp with
> >> aggregate types - these seem to generate a memcpy and
> >> an 8-byte read/writes sometimes, and I'm pretty
2012 Apr 12
2
[net-next V7 PATCH] virtio-net: send gratuitous packets when needed
...rvisor would
notice the guest when it thinks it's time for guest to announce the link
presnece. Guest tests VIRTIO_NET_S_ANNOUNCE bit during config change interrupt
and woule send gratuitous packets through netif_notify_peers() and ack the
notification through ctrl vq.
We need to make sure the atomicy of read and ack in guest otherwise we may ack
more times than being notified. This is done through handling the whole config
change interrupt in an non-reentrant workqueue.
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
Changes from v6:
- move the whole event processing to system_n...
2012 Apr 12
2
[net-next V7 PATCH] virtio-net: send gratuitous packets when needed
...rvisor would
notice the guest when it thinks it's time for guest to announce the link
presnece. Guest tests VIRTIO_NET_S_ANNOUNCE bit during config change interrupt
and woule send gratuitous packets through netif_notify_peers() and ack the
notification through ctrl vq.
We need to make sure the atomicy of read and ack in guest otherwise we may ack
more times than being notified. This is done through handling the whole config
change interrupt in an non-reentrant workqueue.
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
Changes from v6:
- move the whole event processing to system_n...
2016 Nov 25
0
[PATCH 0/3] virtio/vringh: kill off ACCESS_ONCE()
...help.
>
> Peter, thoughts?
Something like so perhaps?
---
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
#define WARN_SINGLE_COPY_ALIGNMENT(ptr) \
WARN_ON_ONCE(((unsigned long)(ptr)) & (sizeof(*(ptr))-1))
#else
#define WARN_SINGLE_COPY_ALIGNMENT(ptr)
#endif
/*
* Provide accessors for Single-Copy atomicy.
*
* That is, ensure that machine word sized loads/stores to naturally
* aligned variables are single instructions.
*
* By reason of not being able to use C11 atomic crud, use our beloved
* volatile qualifier. Since volatile tells the compiler the value can
* be changed behind its back, it m...