On Fri, Sep 28, 2012 at 12:32:07PM +0200, Thierry Reding wrote: > On Fri, Sep 28, 2012 at 11:27:28AM +0100, Mel Gorman wrote: > > On Fri, Sep 28, 2012 at 11:48:25AM +0300, Peter Ujfalusi wrote: > > > Hi, > > > > > > On 09/28/2012 11:37 AM, Mel Gorman wrote: > > > >> I hope this patch fixes the bug. If this patch fixes the problem > > > >> but has some problem about description or someone has better idea, > > > >> feel free to modify and resend to akpm, Please. > > > >> > > > > > > > > A full revert is overkill. Can the following patch be tested as a > > > > potential replacement please? > > > > > > > > ---8<--- > > > > mm: compaction: Iron out isolate_freepages_block() and isolate_freepages_range() -fix1 > > > > > > > > CMA is reported to be broken in next-20120926. Minchan Kim pointed out > > > > that this was due to nr_scanned != total_isolated in the case of CMA > > > > because PageBuddy pages are one scan but many isolations in CMA. This > > > > patch should address the problem. > > > > > > > > This patch is a fix for > > > > mm-compaction-acquire-the-zone-lock-as-late-as-possible-fix-2.patch > > > > > > > > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> > > > > > > linux-next + this patch alone also works for me. > > > > > > Tested-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> > > > > Thanks Peter. I expect it also works for Thierry as I expect you were > > suffering the same problem but obviously confirmation of that would be nice. > > I've been running a few tests and indeed this solves the obvious problem > that the coherent pool cannot be created at boot (which in turn caused > the ethernet adapter to fail on Tegra). > > However I've been working on the Tegra DRM driver, which uses CMA to > allocate large chunks of framebuffer memory and these are now failing. > I'll need to check if Minchan's patch solves that problem as well. Indeed, with Minchan's patch the DRM can allocate the framebuffer without a problem. Something else must be wrong then. Thierry
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