Hi, On Sun, Sep 11, 2011 at 2:32 AM, Michael Blizek <michi1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> >> The whole point of allocating a large chunk of memory is to avoid >> >> extra memory copy because I need to run decompression algorithms on >> >> it. >> > >> > In this case scatterlists solves 2 problems at once. First, you will not need >> > to allocate large continuous memory regions. Second, you avoid wasting memory. >> The problem is that the decompression library works on contiguous >> memory, so I have to provide contiguous memory instead of >> scatterlists. > > Which decompression lib are you talking about? Even if it does not have > explicit support for scatterlists, usually you should be able to call the > decompress function multiple times. Otherwise, how would you (de)compress data > which is larger than available memory? Sorry for the late reply. I'm using LZO. The data is compressed in blocks of 128KB. I don't think I can split the compressed block and run LZO decompressor on the pieces multiple times. There is a lot of free memory, but the kernel can't find contiguous memory sometimes. vmalloc always succeeds when kmalloc fails. Thanks, Da _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
