2011/11/18 Michal Nazarewicz <mina86@xxxxxxxxxx>: > On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil <psandeep.s@xxxxxxxxx> > wrote: >> >> I am running a simple test to allocate contiguous regions and write a log >> on >> in a file on sdcard simultaneously. I can reproduce this migration failure >> 100% >> times with it. >> when I tracked the pages that failed to migrate, I found them on the >> buffer head lru >> list with a reference held on the buffer_head in the page, which >> causes drop_buffers() >> to fail. >> >> So, i guess my question is, until all the migration failures are >> tracked down and fixed, >> is there a plan to retry the contiguous allocation from a new range in >> the CMA region? > > No. Current CMA implementation will stick to the same range of pages also > on consequent allocations of the same size. > Doesn't that mean the drivers that fail to allocate from contiguous DMA region will fail, if the migration fails? ~ sandeep -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
