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.
What mechanism is used in the sk_buff allocation from the interrupt handler?
Is there any background kernel thread which takes care to always provide memory in the interrupt handler for above 3 APIs and for sk_buff?
Regards,
Parav Pandit
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