Messages in this thread | | | Date | Fri, 8 Oct 2010 15:10:47 -0400 | From | Christoph Hellwig <> | Subject | Re: [PATCH 15/18] fs: introduce a per-cpu last_ino allocator |
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On Fri, Oct 08, 2010 at 04:06:12PM +0200, Eric Dumazet wrote: > On 32bit arches, inum for sockets/pipes could be pretty fast > > unsigned u32 rnd_val __read_mostly; /* seeded at boot time */ > > unsigned u32 get_inum(struct inode *ino, size_t size) > { > return rnd_val ^ ((long)ino + random32() % size); > } > > (Ie , use fact that an inode is a kernel object, with a given address > and a given size, two inodes cannot overlap)
Yeah, we could probably do this. From looking at the remaining users of the last_ino replacement this could probably work for them.
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