On Mon, Aug 11, 2014 at 10:34:01AM -0700, Matt Rushton wrote: > Instead of ballooning up and down dom0 memory this remaps the existing mfns > that were replaced by the identity map. The reason for this is that the > existing implementation ballooned memory up and and down which caused dom0 > to have discontiguous pages. In some cases this resulted in the use of bounce > buffers which reduced network I/O performance significantly. This change will > honor the existing order of the pages with the exception of some boundary > conditions. > > To do this we need to update both the Linux p2m table and the Xen m2p table. > Particular care must be taken when updating the p2m table since it's important > to limit table memory consumption and reuse the existing leaf pages which get > freed when an entire leaf page is set to the identity map. To implement this, > mapping updates are grouped into blocks with table entries getting cached > temporarily and then released. > > On my test system before: > Total pages: 2105014 > Total contiguous: 1640635 > > After: > Total pages: 2105014 > Total contiguous: 2098904 > > Signed-off-by: Matthew Rushton <mrush...@amazon.com> > ---
Matt, Could you provide a summary of v2->v3 changes here? --msw > arch/x86/xen/p2m.c | 23 +--- > arch/x86/xen/p2m.h | 15 ++ > arch/x86/xen/setup.c | 370 > +++++++++++++++++++++++++++++++++++++++----------- > 3 files changed, 314 insertions(+), 94 deletions(-) > create mode 100644 arch/x86/xen/p2m.h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
