search for: hypersior

Stephen Hemminger <sthemmin at microsoft.com> writes: > Why not use existing seqlock's? > To be honest I don't quite understand how we could use it -- the sequence locking here is done against the page updated by the hypersior, we're not creating new structures (so I don't understand how we could use struct seqcount which we don't have) but I may be misunderstanding something. BTW, I just occured to me that I should've probably put the TSC reading code to mshyperv.h and use it from both vDSO and read_hv_...

Stephen Hemminger <sthemmin at microsoft.com> writes: > Why not use existing seqlock's? > To be honest I don't quite understand how we could use it -- the sequence locking here is done against the page updated by the hypersior, we're not creating new structures (so I don't understand how we could use struct seqcount which we don't have) but I may be misunderstanding something. BTW, I just occured to me that I should've probably put the TSC reading code to mshyperv.h and use it from both vDSO and read_hv_...

...ly Kuznetsov wrote: > Stephen Hemminger <sthemmin at microsoft.com> writes: > > > Why not use existing seqlock's? > > > > To be honest I don't quite understand how we could use it -- the > sequence locking here is done against the page updated by the > hypersior, we're not creating new structures (so I don't understand how > we could use struct seqcount which we don't have) but I may be > misunderstanding something. You can't use seqlock, but you might be able to use seqcount. Though I doubt it given the 0 check .... Thanks, tglx

...Kuznetsov wrote: > Stephen Hemminger <sthemmin at microsoft.com> writes: > > > Why not use existing seqlock's? > > > > To be honest I don't quite understand how we could use it -- the > sequence locking here is done against the page updated by the > hypersior, we're not creating new structures (so I don't understand > how we could use struct seqcount which we don't have) but I may be > misunderstanding something. You can't use seqlock, but you might be able to use seqcount. Though I doubt it given the 0 check .... Thanks, tgl...

...Kuznetsov wrote: > Stephen Hemminger <sthemmin at microsoft.com> writes: > > > Why not use existing seqlock's? > > > > To be honest I don't quite understand how we could use it -- the > sequence locking here is done against the page updated by the > hypersior, we're not creating new structures (so I don't understand > how we could use struct seqcount which we don't have) but I may be > misunderstanding something. You can't use seqlock, but you might be able to use seqcount. Though I doubt it given the 0 check .... Thanks, tgl...

On Thu, 9 Feb 2017, Vitaly Kuznetsov wrote: > +#ifdef CONFIG_HYPERV_TSCPAGE > +static notrace u64 vread_hvclock(int *mode) > +{ > + const struct ms_hyperv_tsc_page *tsc_pg = > + (const struct ms_hyperv_tsc_page *)&hvclock_page; > + u64 sequence, scale, offset, current_tick, cur_tsc; > + > + while (1) { > + sequence = READ_ONCE(tsc_pg->tsc_sequence); > + if

On Thu, 9 Feb 2017, Vitaly Kuznetsov wrote: > +#ifdef CONFIG_HYPERV_TSCPAGE > +static notrace u64 vread_hvclock(int *mode) > +{ > + const struct ms_hyperv_tsc_page *tsc_pg = > + (const struct ms_hyperv_tsc_page *)&hvclock_page; > + u64 sequence, scale, offset, current_tick, cur_tsc; > + > + while (1) { > + sequence = READ_ONCE(tsc_pg->tsc_sequence); > + if

Hi list readers, I am an experienced developer with only nominal configuration talent. These days, mostly I use ubuntu linux, but have used Debian, WhiteBox, CentOS, RH, Fedora. I have been using Sun VirtualBox to very great effect and hope for better performance by installing and using xen. I also intend to use Dom0 exclusively as a host, and not install any other packages. Instead, I expect to