Messages in this thread | | | Date | Wed, 9 Jan 2008 09:20:08 +0800 | From | "Changli Gao" <> | Subject | Re: [PATCH] Improve scalability of epoll_ctl |
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On Jan 9, 2008 12:56 AM, Andi Kleen <andi@firstfloor.org> wrote: > > Are you sure it's faster? vmalloc/vfree can be quite slow because > they have to change the MMU state of the kernel and take global > locks. I don't think so. In fact, the memory of fdtable is allocated by vmalloc when its size is bigger than PAGE_SIZE:
static inline void * alloc_fdmem(unsigned int size) { if (size <= PAGE_SIZE) return kmalloc(size, GFP_KERNEL); else return vmalloc(size); }
> > The other problem is that on 32bit systems vmalloc space is somewhat > limited -- you might have added an unintended scaling limit.
As I have talked above, I am sure open(), socket() and etc. will first encounter it.
-- Regards, Changli Gao(xiaosuo@gmail.com)
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