On Fri, 2016-01-22 at 08:34 -0700, Jan Beulich wrote:
> >>> On 22.01.16 at 16:22, wrote:
> > On Fri, 2016-01-22 at 08:15 -0700, Jan Beulich wrote:
> >>
> >> There are a number of trailing blanks being added here (and
> further
> >> down), which I'm fixing up as I'm in the process of applying this
>>> On 22.01.16 at 16:22, wrote:
> On Fri, 2016-01-22 at 08:15 -0700, Jan Beulich wrote:
>>
>> There are a number of trailing blanks being added here (and further
>> down), which I'm fixing up as I'm in the process of applying this.
>
> Aside: Do you know about "git am --whitespace=fix" ? It aut
On Fri, 2016-01-22 at 08:15 -0700, Jan Beulich wrote:
>
> There are a number of trailing blanks being added here (and further
> down), which I'm fixing up as I'm in the process of applying this.
Aside: Do you know about "git am --whitespace=fix" ? It automates the
removal of trailing whitespace..
>>> On 22.01.16 at 14:41, wrote:
> --- a/xen/common/grant_table.c
> +++ b/xen/common/grant_table.c
> @@ -178,6 +178,8 @@ struct active_grant_entry {
> #define _active_entry(t, e) \
> ((t)->active[(e)/ACGNT_PER_PAGE][(e)%ACGNT_PER_PAGE])
>
> +DEFINE_PERCPU_RWLOCK_GLOBAL(grant_rwlock);
> +
>
The per domain grant table read lock suffers from significant contention when
performance multi-queue block or network IO due to the parallel
grant map/unmaps/copies occurring on the DomU's grant table.
On multi-socket systems, the contention results in the locked compare swap
operation failing fr
