Messages in this thread | | | Date | Fri, 31 Dec 2004 23:21:04 -0500 (EST) | From | Michael Hines <> | Subject | Re: can you switch between GFP_ATOMIC and GFP_KERNEL? |
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Oh, that's right.
Stupid me =)
Thanks, /*********************************/ Michael R. Hines Grad Student, Florida State Dept. Computer Science http://www.cs.fsu.edu/~mhines/ Jusqu'a ce que le futur vienne... /*********************************/
On Fri, 31 Dec 2004, Roland Dreier wrote:
> Michael> My question is, new sk_buffs are always allocated with > Michael> GFP_KERNEL and can be swapped out. Is it possible to > Michael> change the allocation status of already-allocated memory > Michael> to GFP_ATOMIC on the fly? (i.e. both the slab-cache > Michael> sk_buff header memory as well as the kmalloc'd data > Michael> area). > > This question is ill-posed -- kernel memory can never be swapped out, > whether it's allocated with GFP_KERNEL or GFP_ATOMIC. The difference > between GFP_KERNEL and GFP_ATOMIC is whether the actual allocation can > sleep, that is: > > foo = kmalloc(sizeof foo, GFP_ATOMIC); /* will not sleep */ > foo = kmalloc(sizeof foo, GFP_KERNEL); /* can sleep */ > > However, whichever gfp flags are used to allocate memory, the memory > is the same once the allocation is done. Neither kmalloc'ed memory > nor sk_buffs will ever be swapped. > > - Roland >
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