From: Peter Zijlstra
> Sent: 14 April 2022 16:21
...
>
>
..
> > -#define sched_class_highest (__end_sched_classes - 1)
> > +/*
> > + * sched_class_highests is really __end_sched_classes - 1, but written in
> > a way
> > + * that makes it clear that it is within __begin_sched_classes[] and not
> > Beware, Intel increased the stall for 'rep nop' in some recent
> > cpu to IIRC about 200 cycles.
> >
> > They even document that this might have a detrimental effect.
> > It is basically far too long for the sort of thing it makes
> > sense to busy-wait for.
>
> Thanks for the info:)
> I will
From: Yunsheng Lin
> Sent: 20 July 2021 03:22
>
> As x86 and arm64 is the two available systems that I can build
> and test the cpu_relax() implementation, so only add cpu_relax()
> implementation for x86 and arm64, other arches can be added easily
> when needed.
>
...
> +#if defined(__i386__)
From: Juergen Gross
> Sent: 12 May 2021 09:58
>
> On 12.05.21 10:50, 'Joerg Roedel' wrote:
> > On Wed, May 12, 2021 at 10:16:12AM +0200, Juergen Gross wrote:
> >> You want something like xen_safe_[read|write]_ulong().
> >
> > From a first glance I can't see it, what is the difference between the
From: Joerg
> Sent: 12 May 2021 08:55
>
> From: Joerg Roedel
>
> The put_user() and get_user() functions do checks on the address which is
> passed to them. They check whether the address is actually a user-space
> address and whether its fine to access it. They also call might_fault()
> to
From: Geert Uytterhoeven
> Sent: 24 February 2020 12:54
> To: Krzysztof Kozlowski
...
> > > > diff --git a/drivers/net/wireless/ath/ath5k/ahb.c
> > > > b/drivers/net/wireless/ath/ath5k/ahb.c
> > > > index 2c9cec8b53d9..8bd01df369fb 100644
> > > > --- a/drivers/net/wireless/ath/ath5k/ahb.c
> > >
From: Christophe Leroy
> Sent: 08 January 2020 08:49
...
> And as pointed by Arnd, the volatile is really only necessary for the
> dereference itself, should the arch use dereferencing.
I've had trouble with some versions of gcc and reading of 'volatile unsigned
char *'.
It tended to follow the
From: Michael Matz
> Sent: 07 October 2018 16:53
...
> I think the examples I saw from Boris were all indirect inlines:
>
> static inline void foo() { asm("large-looking-but-small-asm"); }
> static void bar1() { ... foo() ... }
> static void bar2() { ... foo() ... }
> void goo (void) {
From: Marcelo Ricardo Leitner
> Sent: 20 August 2018 15:54
> On Wed, May 02, 2018 at 11:38:24AM -0300, Marcelo Ricardo Leitner wrote:
> > On Tue, May 01, 2018 at 10:07:35PM -0400, Vladislav Yasevich wrote:
> > > With SCTP checksum offload available in virtio, it is now
> > > possible for virtio to
-
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From: Nadav Amit
> Sent: 17 May 2018 17:14
> This patch-set deals with an interesting yet stupid problem: kernel code
> that does not get inlined despite its simplicity. There are several
> causes for this behavior: "cold" attribute on __init, different function
> optimization levels; conditional
From: Tiwei Bie
> Sent: 23 February 2018 11:18
...
> +struct vring_packed_desc_event {
> + /* Descriptor Event Offset */
> + __virtio16 desc_event_off : 15,
> + /* Descriptor Event Wrap Counter */
> +desc_event_wrap : 1;
> + /* Descriptor Event Flags */
> +
From: Alex Williamson
> Sent: 15 May 2017 04:21
...
> > > /* Find end of list, sew whole thing into vi->rq.pages. */
> > > - for (end = page; end->private; end = (struct page *)end->private);
> > > + for (end = page; end->private; end = (struct page *)end->private)
> > > + ;
>
> FWIW, I
From: Pan Xinhui
> Sent: 20 October 2016 22:28
> Commit ("x86, kvm: support vcpu preempted check") add one field "__u8
> preempted" into struct kvm_steal_time. This field tells if one vcpu is
> running or not.
>
> It is zero if 1) some old KVM deos not support this filed. 2) the vcpu is
>
From: Jason Wang
On Mon, Dec 01, 2014 at 06:17:03PM +0800, Jason Wang wrote:
Hello:
We used to orphan packets before transmission for virtio-net. This
breaks
socket accounting and can lead serveral functions won't work, e.g:
- Byte Queue Limit depends on tx completion
From: Michael S. Tsirkin
Too many places poke at [rs]q-vq-vdev-priv just to get
the the vi structure. Let's just pass the pointer around: seems
cleaner, and might even be faster.
Signed-off-by: Michael S. Tsirkin m...@redhat.com
---
drivers/net/virtio_net.c | 36
From: Michael S. Tsirkin
On Wed, Oct 15, 2014 at 09:49:01AM +, David Laight wrote:
From: Of Michael S. Tsirkin
On Wed, Oct 15, 2014 at 03:25:27PM +0800, Jason Wang wrote:
Accumulate the sent packets and sent bytes in local variables and
perform a
single
From: Michael S. Tsirkin
commit 0b725a2ca61bedc33a2a63d0451d528b268cf975
net: Remove ndo_xmit_flush netdev operation, use signalling instead.
added code that looks at skb-xmit_more after the skb has
been put in TX VQ. Since some paths process the ring and free the skb
immediately, this
From: Razya Ladelsky
Michael S. Tsirkin m...@redhat.com wrote on 20/08/2014 01:57:10 PM:
Results:
Netperf, 1 vm:
The polling patch improved throughput by ~33% (1516 MB/sec - 2046
MB/sec).
Number of exits/sec decreased 6x.
The same improvement was shown when I tested with 3
+enum fsl_hv_ioctl_cmd {
+ FSL_HV_IOCTL_PARTITION_RESTART = _IOWR(0, 1, struct
fsl_hv_ioctl_restart),
...
+};
Using a #define here is usually preferred because then you
can use #ifdef in a user application to check if a given
value has been assigned.
It is also possible to
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