Curious for the below, why it is a sum? Will you use all of format at the same time?
> 1 RAW16: 2*14 = 28MB > 1 qplane6: 6/4 * 14 = 21MB > 1 yuv420_16: 2 * 1.5 * 14 = 42MB > 1 yuv420: 1.5 * 14 = 21MB > 1 yuv444: 3 * 14 = 42MB > total: 154MB. > -----Original Message----- > From: umg-meego-handset-kernel-boun...@umglistsvr.jf.intel.com > [mailto:umg-meego-handset-kernel-boun...@umglistsvr.jf.intel.com] On > Behalf Of Wang, Wen W > Sent: Wednesday, February 09, 2011 2:23 PM > To: linux-media@vger.kernel.org; umg-meego-handset- > ker...@umglistsvr.jf.intel.com > Cc: Jozef Kruger > Subject: [Umg-meego-handset-kernel] Memory allocation in Video4Linux > > Hi, > > We are developing the image processor driver for Intel Medfield platform. > > We have received some comments on memory management that we should use > standard Linux kernel interfaces for this, since we are doing everything > by ourselves including memory allocation (based on pages), page table > management, virtual address management and etc. > > So can you please help give some advice or suggestion on using standard > kernel interface for memory management? > > The processor has a MMU on-chip with same virtual address range as IA. The > processor will access system memory (read and write) through MMU and page > table. The memory consumption of the driver could be quite big especially > for high resolution (14MP) with certain features turned on. > For example: advanced ISP with XNR and yuv444 output, at 14MP this uses: > 1 RAW16: 2*14 = 28MB > 1 qplane6: 6/4 * 14 = 21MB > 1 yuv420_16: 2 * 1.5 * 14 = 42MB > 1 yuv420: 1.5 * 14 = 21MB > 1 yuv444: 3 * 14 = 42MB > total: 154MB. > > Thanks > Wen > _______________________________________________ > Umg-meego-handset-kernel mailing list > umg-meego-handset-ker...@umglistsvr.jf.intel.com > http://umglistsvr.jf.intel.com/mailman/listinfo/umg-meego-handset-kernel -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
