RE: [Xen-devel] RFC: 32 bits as smallest atomic size.

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

>>>>> "IP" == Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> writes:

 >> Right now there is a single problematic cmpxchg user, 
 >> grant_entry_t, and the impact of the fix is tiny (make the 
 >> 'flags' member 4 bytes). Is that too large an inconvenience?

 IP> That would make grant table entries 12 bytes rather than 8 bytes, which
 IP> is not ideal given that you can end up needing quite a lot of them,
 IP> particularly when the cacheline packing is considered. 

Actually, the lock field can be 1 bit for all I care, as long as the
atomic method to change it word sized.

This is quite a reasonable request.
-JX

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