On Thu, 2006-10-12 at 01:40 -0700, Parav Pandit wrote: > Hi, > > I need to allocate some 256 bytes of memory in the interrupt handler > each time when I get the interrupt. Size varies from 8 bytes to 256 > bytes. > There are various options such as > (a) kmalloc(GFP_ATOMIC), > (b) kmem_cache_alloc > (c) mempool_alloc > My driver need to support, at max 4096 * 256 = 1MByte buffer. I don’t > need DMA support. > > How can I use above APIs so that I always get the memory in the > interrupt handler? > I don’t want to implement my own memory manager where I pre-allocate > 1Mbytes + few pointers to always avail memory in the interrupt > handler. you should use a mempool then; mempools can preallocate the memory for you as long as the amount you need is bounded (like in your case) > > What mechanism is used in the sk_buff allocation from the interrupt > handler? sk_buffs are different; if there's no memory the packet is just dropped; that's "normal" since in networking packets can be dropped anywhere on the network.. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
