Hi Nishant, From: "ext Kamat, Nishant" <nskamat@xxxxxx> Subject: dma_alloc_coherent fragmentation Date: Wed, 18 Mar 2009 14:03:45 +0100 > Forwarding on behalf of Nishanth Menon: > > -----Original Message----- > From: Menon, Nishanth > Sent: Tuesday, March 17, 2009 8:17 AM > To: 'linux-arm-kernel@xxxxxxxxxxxxxxxxxxxxxx' > Cc: Gupta, Ramesh; Kevin Hilman; linux-omap@xxxxxxxxxxxxxxx; Ramirez Luna, Omar; Kanigeri, Hari; Ameya Palande; Guzman Lugo, Fernando; Ameya Palande > Subject: dma_alloc_coherent fragmentation > > Looping in linux-arm ML: > > Discussion Ref: [1](linux-omap mailing list) > While working with Linux OMAP kernel[2] we found that on allocating > 4 meg chunks using dma_alloc_coherent and de-allocating with > dma_free_coherent in a loop using a test driver[7], the memory is > getting fragmented as shown by Ameya's observation [3] finally > resulting in dump_stack due to lack of pages. What would happen with __GFP_RECLAIMABLE for dma_alloc_coherent()? -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
