I remember some Continous Memory Allocator (CMA) being iterated down a few versions on some mailing lists? IIRC, it is also for large buffers and management for video IPs.
Cheers! > -----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 12:03 PM > To: Yang, Jianwei; linux-media@vger.kernel.org; umg-meego-handset- > ker...@umglistsvr.jf.intel.com > Cc: Jozef Kruger > Subject: Re: [Umg-meego-handset-kernel] Memory allocation in Video4Linux > > Yes. Some are internal frame and yuv444 is the output. > > >-----Original Message----- > >From: Yang, Jianwei > >Sent: 2011年2月9日 14:31 > >To: Wang, Wen W; linux-media@vger.kernel.org; > >umg-meego-handset-ker...@umglistsvr.jf.intel.com > >Cc: Jozef Kruger > >Subject: RE: Memory allocation in Video4Linux > > > >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 > _______________________________________________ > 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
