Re: [Xen-devel] [PATCH 0/2] Refactor ioreq server for better performance.

["Yu, Zhang" <yu.c.zhang@xxxxxxxxxxxxxxx>]

A new patchset with v2 prefix and change log was just sent out.
So please ignore this thread, and sorry for the inconvenience. :)

Yu

On 7/2/2015 11:07 PM, Yu, Zhang wrote:
> Oh, I forgot the version number and change history.
> This patchset should be version 2.
>
> The change history should be:
> 1> Split the original patch into 2;
> 2> Take Paul Durrant’s comments:
>      a> Add a name member in the struct rb_rangeset, and use the ‘q’
> debug key to dump the ranges in ioreq server;
>      b> Keep original routine names for hvm ioreq server;
>      c>. Commit message changes – mention that a future patch to change
> the maximum ranges inside ioreq server;
>
> Sorry, my fault. Could I add this change history in next version,
> or should I resend the version 2? :)
>
> Thanks
> Yu
>
> On 7/2/2015 8:31 PM, Yu Zhang wrote:
> > XenGT leverages ioreq server to track and forward the accesses to
> > GPU I/O resources, e.g. the PPGTT(per-process graphic translation
> > tables). Currently, ioreq server uses rangeset to track the BDF/
> > PIO/MMIO ranges to be emulated. To select an ioreq server, the
> > rangeset is searched to see if the I/O range is recorded. However,
> > traversing the link list inside rangeset could be time consuming
> > when number of ranges is too high. On HSW platform, number of PPGTTs
> > for each vGPU could be several hundred. On BDW, this value could
> > be several thousand.
> >
> > To accommodate more ranges, limitation of the number of ranges in an
> > ioreq server, MAX_NR_IO_RANGES is changed - future patches will be
> > provided to tune this with other approaches. And to increase the ioreq
> > server performance, a new data structure, rb_rangeset, is introduced.
> >
> > Yu Zhang (2):
> >    Resize the MAX_NR_IO_RANGES for ioreq server
> >    Add new data structure to track ranges.
> >
> >   xen/arch/x86/domain.c            |   3 +
> >   xen/arch/x86/hvm/hvm.c           |  56 ++++++--
> >   xen/common/Makefile              |   1 +
> >   xen/common/rb_rangeset.c         | 281
> > +++++++++++++++++++++++++++++++++++++++
> >   xen/include/asm-x86/hvm/domain.h |   4 +-
> >   xen/include/asm-x86/hvm/hvm.h    |   1 +
> >   xen/include/xen/rb_rangeset.h    |  49 +++++++
> >   7 files changed, 379 insertions(+), 16 deletions(-)
> >   create mode 100644 xen/common/rb_rangeset.c
> >   create mode 100644 xen/include/xen/rb_rangeset.h
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