Hello Petr, On Tue, 28 Aug 2012 19:49:49 +0200 Petr Tesarik <ptesarik at suse.cz> wrote: > Add a simple cache for pages read from the dumpfile. > > This is a big win if we read consecutive data from one page, e.g. > page descriptors, or even page table entries. > > Note that makedumpfile now always reads a complete page. This was already > the case with kdump-compressed and sadump formats, but makedumpfile was > throwing most of the data away. For the kdump-compressed case, we may > actually save a lot of decompression, too. > > I tried to keep the cache small to minimize memory footprint, but it should > be big enough to hold all pages to do 4-level paging plus some data. This > is needed e.g. for vmalloc areas or Xen page frame table data, which are not > contiguous in physical memory. > > Signed-off-by: Petr Tesarik <ptesarik at suse.cz> It's interesting to me. I want to know how performance will be improved with this patch, so do you have speed measurements ? Thanks Atsushi Kumagai
