On 04/28/14 at 12:21pm, Petr Tesarik wrote: > On Mon, 28 Apr 2014 15:56:05 +0800 > Baoquan He <bhe at redhat.com> wrote: > > > Hi Astushi, > > > > I remember earlier Jingbai posted a patchset on hugepage filtering, > > later you pasted your hugepage filtering prototype patch, and people > > thought yours is better. So now may I know the status and what's your > > plan? > > > > Because in makedumpfile 1.5.6, this is not delivered. Your plan can help > > us much. > > Hi Baoquan, > > I followed up on Atsushi's prototype, and there's a patch series > sitting on my disk which just came too late for 1.5.6, so I held it > back. It was also suggested that the mdf_pfn cleanup patch be applied > first. That one is now in, and I'll send an updated series shortly. > > The first part of the change is the "Generic handling of multi-page > exclusions", that is a method which can be used for excluding both free > pages and compound pages (and without adding even more complexity to > the calculation of the cycle size). > > The second part is handling of hugepages. This simply extends the > algorithm so that all pages in a compound page are treated as one > object. To make it work, additional info must be exported from the > kernel. This is where I got stuck with my previous attempt. For now, > this patch is already in the mm tree: > > http://ozlabs.org/~akpm/mmotm/broken-out/kexec-save-pg_head_mask-in-vmcoreinfo.patch Hi Petr, Good to know this progress. And it's awesome that kernel patch exporting PG_head_mask has been in mm tree. I saw people had discussed heatedly about the generic handling of multi-page exclusions. So as long as the first part passes through and merged in, hugepage filtering adding will be supported very smoothly, is that right? I didn't follow up that thread very closely, if yes, it's a great news. And thanks for your effort. Thanks Baoquan > > Petr T
