Messages in this thread | | | Date | Sat, 28 Jan 2006 00:21:07 +0100 | From | Eric Dumazet <> | Subject | Re: [patch 3/4] net: Percpufy frequently used variables -- proto.sockets_allocated |
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Ravikiran G Thirumalai a écrit : > On Fri, Jan 27, 2006 at 11:30:23PM +0100, Eric Dumazet wrote: >> There are several issues here : >> >> alloc_percpu() current implementation is a a waste of ram. (because it uses >> slab allocations that have a minimum size of 32 bytes) > > Oh there was a solution for that :). > > http://lwn.net/Articles/119532/ > > I can quickly revive it if there is interest. >
Well, nice work ! :)
Maybe a litle bit complicated if expected percpu space is 50 KB per cpu ?
Why not use a boot time allocated percpu area (as done today in setup_per_cpu_areas()), but instead of reserving extra space for module's percpu data, being able to serve alloc_percpu() from this reserved area (ie no kmalloced data anymore), and keeping your
#define per_cpu_ptr(ptr, cpu) ((__typeof__(ptr)) \ (RELOC_HIDE(ptr, PCPU_BLKSIZE * cpu)))
Some code from kernel/module.c could be reworked to serve both as an allocator when a module percpudata must be relocated (insmod)/freed (rmmod), and serve alloc_percpu() for 'dynamic allocations'
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